Curriculum Vitae of Prof Leon Liebenberg

1. General information

Title, name and surname: Prof Leon Liebenberg

Date of birth: 10 Des 1964

Citizenship: RSA

Professional registrations: PrEng (Engineering Council of SA)

2. Contact details

Organisation where based: North-West University (NWU)

Faculty or School: Engineering

Work telephone number: 012 809-0995

Work fax number: 086 661-8408

Cell phone number: -

E-mail address: lliebenberg@researchtoolbox.com

Website address: http://www.nwu.ac.za

Work postal address: CRCED (Pta) Suite no 93 Private Bag X30 Lynnwood Ridge 0040

Work physical address: CRCED (Pta) Silver Lakes Office Park 2 Block D Von Backstrohm Boulevard Silver Lakes Pretoria

3. Qualifications

Qualification type: DEng

Field of study: Mechanical Engineering

Institution: University of Johannesburg

Year obtained: 2003

Qualification type: MSc

Field of study: Advanced Mechanical Engineering

Institution: Imperial College London

Year obtained: 1993

Qualification type: Diploma of the Imperial College

Field of study: Advanced Mechanical Engineering

Institution: Imperial College London

Year obtained: 1992

Qualification type: MEng

Field of study: Mechanical Engineering

Institution: University of Johannesburg

Year obtained: 1991

Qualification type: BEng

Field of study: Mechanical Engineering

Institution: University of Johannesburg

Year obtained: 1989

4. Employment history

Position: Organisation Appointed from – to:

Professor North-West University (NWU) 2009 -

Professor University of Pretoria (UP) 2003 - 2009

Senior Lecturer University of Johannesburg 1994 - 2003

Lecturer University of Johannesburg 1992 - 1994

Project Leader SA Plant and Engineering 1991 - 1992

Project Leader Kruger Du Rand Inc 1989 - 1990

5. Research expertise

Scientific domain: Natural sciences and engineering

Main research field: Mechanical engineering

Fields of specialization: Energy efficiency engineering; heat transfer augmentation; vehicle power plants; alternative energy systems; reverse engineering and redesign

NRF rating and year rated: C-2 (2005 – 2010)

6. Publications

International publications:

1. Liebenberg L, Christians M, Van Rooyen E. State-of-the-art in vehicle propulsion systems. Report prepared for Eskom R&D, May 2006. 2. Liebenberg L. The cooling of aircraft reciprocating engines. Report prepared for Denel Dynamics, Unmanned Aerial Vehicle division, February 2004.Liebenberg L. Heat pump water 3. heaters using non-azeotropic refrigerant mixtures. Rand Afrikaans University, Internal Report KIB 116, Faculty of Engineering, July 1996. 4. Liebenberg L. Heat pumps using non-azeotropic refrigerant mixtures. Rand Afrikaans University, Internal Report KIB 115, Faculty of Engineering, April 1996. 5. Liebenberg L. The future of gas turbines in power generation. Report prepared for Eskom TRI, 1993. 6. Liebenberg L. The quenching of a steel ingot with radiation and forced convection boundary cooling. AMechE Report 92-7, Imperial College of Science, Technology, and Medicine, 1992. 7. Lim CK, Liebenberg L, and Manailoglu L. The design of a steel wall to withstand fluid flow arising from a complete failure of a high-pressure containment vessel. AMechE Report 92-14, Imperial College of Science, Technology, and Medicine, 1992. 8. Liebenberg L. Energy conservation and energy efficiency in the British Iron and Steel Industry. AMechE Report 92-34, Imperial College of Science, Technology, and Medicine, 1992.

9. Liebenberg L. Hydrostatic transmissions for vehicles. Rand Afrikaans University, Internal Report KD 67, Faculty of Engineering, Sept 1990. 10. Liebenberg L. Colloquium: alternative vehicle drive technology. Rand Afrikaans University, Internal Report KD 64, Faculty of Engineering, May 1990. 11. Liebenberg L. Secondary control versus conventional mechanical and hydrostatic drives. Rand Afrikaans University, Internal Report KD 63, Faculty of Engineering, Feb 1990.

National publications:

1.Nel, H.-J., Liebenberg, L., and Lombaard, F, 2009, “Compensating for the fouling of air-cooled heat exchangers, pp. 30 – 32. 2. Liebenberg, L. and De Kock, D., 2005, “CFD for Future Engineers,” Fluent News, Fall, pp. 25. 3. Liebenberg, L., 2004, “Computing for High-Flyers,” Quest, Vol. 1, No. 2. 4. Liebenberg, L., 2002, “SA Role Models Have Their Say,” For Engineering Educators, Centre for Research in Engineering Education, Vol. 6, No. 2, pp. 3 – 7. 5. Liebenberg, L., 2001, “The Plight of SA Women in Engineering,” Martin Creamer’s Engineering News, Jan. 12 – 18, pp. 16 – 17. 6. Meyer, J.P., and Liebenberg, L., 2000, “Experimental Evaluation of Five Refrigerants as Replacements for R- 22,” Mechanical Technology, July, pp. 29 – 32. 7. Liebenberg, L., 2000, “Why Micro-fin Tubes Enhance Condensation Heat Transfer,” August, pp. 27 – 30. 8. Coetzee, H., Liebenberg, L., and Meyer, J.P., 2000, “Performance Characteristics of Angled Spiraling Tape Inserts in a Heat Exchanger Annulus, Mechanical Technology, July, pp. 7 –10. 9. Liebenberg, L., 2000, “Why Micro-fin Tubes Enhance Condensation Heat Transfer,” Mechanical Technology, August. 10. Liebenberg, L., 1997, “Non-azeotropic Refrigerant Mixtures for Heat Pumps,” Mechanical Technology, pp. 19 – 23. 11. Liebenberg, L., 1997, “Unconventional Hydrostatic Transmissions for Vehicles,”1997, Mechanical technology, pp. 5 – 7, June. 12. Liebenberg, L. and Greyling, F., 1997, “Nuwe tegnologie-visie neem hier vorm aan,” Beeld, 14 Mei. 13. Liebenberg, L., and Creamer. D., 1995, “More Engineers, Scientists and Technologists needed for Sustainable Economic Development,” Martin Creamer’s Engineering News, 4 August. 14. Benade, J, and Liebenberg, L., 1996, “TechnoLab Activities,” Archimedes, Vol. 38, No. 3, pp. 16 – 17. 15. Liebenberg, L., 1995, “Recumbent Bicycles,” Archimedes, Vol. 37, No. 2, pp. 46 – 47. 16. Liebenberg, L., 1997, “Non-azeotropic Refrigerant Mixtures for Heat Pumps,” Mechanical Technology, January, pp. 19 – 23.

1000-word Articles published in Mechanical Technology 17. Liebenberg, L., 1997, “Technology for All,” Mechanical Technology, January, p. 3. 18. Liebenberg, L., 1997, “Not what it used to be,” Mechanical Technology, March, p. 3. 19. Liebenberg, L., 1997, “Following in the footsteps,” Mechanical Technology, April, p. 3. 19. Liebenberg, L., 1997, “The Professional Engineer,” Mechanical Technology, July, p. 3. 20. Liebenberg, L., 1997, “Engineering Materialism,” Mechanical Technology, August, p. 3. 21. Liebenberg, L., 1997, “Learning the latest technology is not just smart; it’s crucial,” Mechanical Technology, Sept, p. 3. 22. Liebenberg, L., 1997, “Could it be a perfect world?” Mechanical Technology, Oct, p. 3. 23. Liebenberg, L., 1997, “Evolution of a revolution” Mechanical Technology, Nov, p. 3. 24. Liebenberg, L., 1997, “Year-end self appraisal” Mechanical Technology, Dec, p. 3. 25. Liebenberg, L., 1998, “Successful Year of Science and Technology (YEAST) Requires Industry Input” Mechanical Technology, Jan, p. 3. 26. Liebenberg, L., 1998, “Successful Year of Science and Technology (YEAST) Requires Industry Input,” Mechanical Technology, Jan, p. 3. 27. Liebenberg, L., 1998, “http://www.changing-everything.com,” Mechanical Technology, Feb, p. 3. 28. Liebenberg, L., 1998, “Smashing Technology,” Mechanical Technology, March, p. 3. 29. Liebenberg, L., 1998, “Not that bad,” Mechanical Technology, April, p. 3. 30. Liebenberg, L., 1998, “The spirit of innovation,” Mechanical Technology, June, p. 3. 31. Liebenberg, L., 1998, “Is engineering a cool career?” Mechanical Technology, July, p. 3. 32. Liebenberg, L., 1998, “Alternatives to alternative refrigerants” Mechanical Technology, Aug, p. 3. 33. Liebenberg, L., 1998, “Why do the good die young?” Mechanical Technology, Sept, p. 3. 34. Liebenberg, L., 1998, “Wanted-reinvented engineers,” Mechanical Technology, Oct, p. 3. 35. Liebenberg, L., 1999, “A Fragile Future,” Mechanical Technology, Jan, p. 1. 36. Liebenberg, L., 1999, “Engineers and Wealth Creation,” Mechanical Technology, Feb, p. 1. 37. Liebenberg, L., 1999, “The Natural Choice,” Mechanical Technology, March, p. 1. 38. Liebenberg, L., 1999, “Millennium Mayhem Looming,” Mechanical Technology, Apr, p. 1. 39. Liebenberg, L., 1999, “Bickering academia versus industrial frenzy,” Mechanical Technology, May, p. 1. 40. Liebenberg, L., 1999, “Imagineering,” Mechanical Technology, July, p. 1. 41. Liebenberg, L., 1999, “Stress at work can kill,” Mechanical Technology, Aug, p. 1.

42. Liebenberg, L., 1999, “Popes, Monks and y2k,” Mechanical Technology, Sept, p. 1. 43. Liebenberg, L., 1999, “Globalization of engineering practice,” Mechanical Technology, Oct, p. 1. 44. Liebenberg, L., 1999, “Women in engineering,” Mechanical Technology, Oct, p. 1. 45. Liebenberg, L., 2000, “What a century that was!” Mechanical Technology, Jan, p. 1. 46. Liebenberg, L., 2000, “Soaring Ahead,” Mechanical Technology, Feb, p. 1. 47. Liebenberg, L., 2000, “A Changing World,” Mechanical Technology, March, p. 1. 48. Liebenberg, L., 2000, “Ethics in Engineering,” Mechanical Technology, April, p. 1. 49. Liebenberg, L., 2000, “Solar Storms could Wreak Major Havoc,” Mechanical Technology, May, p. 1. 50. Liebenberg, L., 2000, “Re-engineering engineering education,” Mechanical Technology, June, p. 1. 51. Liebenberg, L., 2000, “Wanted: High-temperature Heat Exchangers,” Mechanical Technology, July, p. 1. 52. Liebenberg, L., 2000, “Towards Holism,” Mechanical Technology, Aug, p. 1. 53. Liebenberg, L., 2000, “Updating welding knowledge and skills,” Mechanical Technology, Sept, p. 1. 54. Liebenberg, L., 2000, “From E- to M- Commerce,” Mechanical Technology, Oct, p. 1. 55. Liebenberg, L., 2000, “Creating Technology Awareness,” Mechanical Technology, Nov, p. 1. 56. Liebenberg, L., 2000, “Mirrored by Our Innovations,” Mechanical Technology, Dec, p. 1. 57. Liebenberg, L., 2001, “Cholera and Creativity,” Mechanical Technology, Jan, p. 1. 58. Liebenberg, L., 2001, “Boeings, budgies and trout,” Mechanical Technology, Feb, p. 1. 59. Liebenberg, L., 2001, “Entropy and Poker,” Mechanical Technology, March, p. 1. 60. Liebenberg, L., 2001, “Analog beings in a bizarre world,” Mechanical Technology, April, p. 1. 61. Liebenberg, L., 2001, “Knowledge: the great equaliser,” Mechanical Technology, May, p. 1. 62. Liebenberg, L., 2001, “Black boxes are becoming larger,” Mechanical Technology, June, p. 1. 63. Liebenberg, L., 2001, “Progress Toward What?” Mechanical Technology, July, p. 1. 64. Liebenberg, L., 2001, “Nuclear Reactors for a Power Hungry World,” Mechanical Technology, Aug, p. 1. 65. Liebenberg, L., 2001, “Man is the measure of all things,” Mechanical Technology, Sept, p. 1. 66. Liebenberg, L., 2001, “Ways to kill people,” Mechanical Technology, Oct, p. 1. 67. Liebenberg, L., 2001, “More imagination please,” Mechanical Technology, Nov, p. 1. 68. Liebenberg, L., 2001, “Adam’s Apple,” Mechanical Technology, Dec, p. 1. 69. Liebenberg, L., 2002, “Back to varsity and technikon,” Mechanical Technology, Jan, p. 1.

70. Liebenberg, L., 2002, “Making sense of the Rand,” Mechanical Technology, Feb, p. 1. 71. Liebenberg, L., 2002, “The ever-increasing face of change,” Mechanical Technology, March, p. 1. 72. Liebenberg, L., 2002, “Technology meets art,” Mechanical Technology, April, p. 1. 73. Liebenberg, L., 2002, “The role of engineering in sustainable development,” Mechanical Technology, July, p. 1. 74. Liebenberg, L., 2002, “Increased use of wind power,” Mechanical Technology, Aug, p. 1. 75. Liebenberg, L., 2002, “James Watt was a Lunatick,” Mechanical Technology, Sept, p. 1. 76. Liebenberg, L., 2002, “How to kill a team’s creativity,” Mechanical Technology, Oct, p. 1. 77. Liebenberg, L., 2002, “Man’s yearning for genius,” Mechanical Technology, Nov, p. 1. 78. Liebenberg, L., 2002, “We can grow old gracefully,” Mechanical Technology, Dec, p. 1. 79. Liebenberg, L., 2003, “The PhD Animal,” Mechanical Technology, Jan, p. 1. 80. Liebenberg, L., 2003, “What we don’t know does hurt us,” Mechanical Technology, May, p. 1. 81. Liebenberg, L., 2003, “Do not privatize the university,” Mechanical Technology, June, p. 1. 82. Liebenberg, L., 2003, “Engineers are natural born skeptics,” Mechanical Technology, July, p. 1. 83. Liebenberg, L., 2003, “Why boomerangs fly and come back,” Mechanical Technology, Sept, p. 1. 84. Liebenberg, L., 2003, “Why didn’t I think of it?” Mechanical Technology, Oct, p. 1. 85. Liebenberg, L., 2003, “100 years of powered flight,” Mechanical Technology, Nov, p. 1. 86. Liebenberg, L., 2003, “Learning, caring and meaningfulness,” Mechanical Technology, Dec, p. 1. 87. Liebenberg, L., 2004, “Do we really need warships?” Mechanical Technology, Jan, p. 1. 88. Liebenberg, L., 2004, “Sea Power to help Ensure Peace and Prosperity,” Mechanical Technology, Feb, p. 1. 89. Liebenberg, L., 2004, “Improving ethical engineering practice,” Mechanical Technology, March, p. 1. 90. Liebenberg, L., 2004, “Serendipity,” Mechanical Technology, April, p. 1. 91. Liebenberg, L., 2004, “Rather stick around positive thinkers“, Mechanical Technology, May, p. 1 92. Liebenberg, L., 2004, “Separate but unequal“, Mechanical Technology, June, p. 1 93. Liebenberg, L., 2004, “The Cell Phone Scare“, Mechanical Technology, July, p. 1 94. Liebenberg, L., 2004, “Small things considered”, Mechanical Technology, August, p. 1 95. Liebenberg, L., 2004, “The year 2000: A view from 1967,” September, p. 1 7 96. Liebenberg, L., 2004, “Innovation Provides the Competitive Edge,” October, p.1 97. Liebenberg, L., 2004, “Bright Ideas,” November, p. 1

98. Liebenberg, L., 2004, “Growing Up,” December, p. 1 99. Liebenberg, L., 2005, “Creativity in Engineering,” January, p. 1 100. Liebenberg, L., 2005, “Einstein’s Legacy,” March, pp. 1 101. Liebenberg, L., 2005, “Thinking Outside the Box—the inside story,” June, p. 1 102. Liebenberg, L., 2005, “Polymaths Required,”, August, p. 1 103. Liebenberg, L., 2005, “A Flat World?,” October, p. 1 104. Liebenberg, L., 2005, “What Good is a Newborn Baby,” p.1 105. Liebenberg, L, 2006, “Cars of the Future,” April, p.1 106. Liebenberg, L., 2004, “Serendipity,” Mechanical Technology, April, p. 1. 107. Liebenberg, L., 2004, “Rather stick around positive thinkers“, Mechanical Technology, May, p. 1. 108. Liebenberg, L., 2004, “Separate but unequal“, Mechanical Technology, June, p. 1. 109. Liebenberg, L., 2004, “The Cell Phone Scare“, Mechanical Technology, July, p. 1. 110. Liebenberg, L., 2004, “Small things considered”, Mechanical Technology, August, p. 1. 111. Liebenberg, L., 2004, “The year 2000: A view from 1967,” September, p. 1. 112. Liebenberg, L., 2004, “Innovation Provides the Competitive Edge,” October, p.1. 113. Liebenberg, L., 2004, “Bright Ideas,” November, p. 1. 114. Liebenberg, L., 2004, “Growing Up,” December, p. 1. 115. Liebenberg, L., 2005, “Creativity in Engineering,” January, p. 1. 116. Liebenberg, L., 2005, “Einstein’s Legacy,” March, p. 1. 117. Liebenberg, L., 2005, “Thinking Outside the Box—the inside story,” June, p. 1. 118. Liebenberg, L., 2005, “Polymaths Required,”, August, p. 1. 119. Liebenberg, L., 2005, “A Flat World?”, October, p. 1. 120. Liebenberg, L., 2005, “What Good is a Newborn Baby,” p.1. 121. Liebenberg, L, 2006, “Cars of the Future,” April, p.1. 122. Liebenberg, L., 2006, “Human logic and Nature,” August, p. 1. 123. Liebenberg, L., 2007, “Globalising engineering education,” September, p. 1. 124. Liebenberg, L., 2008, “A future we can live with,” March, p. 1.

7. Papers delivered

International papers: 1. Liebenberg L, Bunt EA. Wave drag coefficient of a model Busemann-biplane catamaran. Experiments in Fluids, 9, 352-354, 1990.

2. Liebenberg L, Krüger JJ. Computer controlled Hydrostatic Transmission with Traction Control for Vehicles. SAE Transactions, 901559, 1991.

3. Liebenberg L, Bunt EA. Wave drag coefficient of a model Busemann-biplane catamaran (Part 2). Experiments in Fluids, 14, 277-279, 1993.

4. Liebenberg L, Nel AL, Pullen KR. Computer simulation of a gas turbine hybrid electric vehicle. SAE Transactions, 941733, 1994.

5. Coetzee H, Liebenberg L and Meyer JP; Angled spiralling tape inserts in a heat exchanger annulus. R & D Journal,

Vol. 19, No. 2, pp. 3 – 10, 2003. 6. Coetzee H, Liebenberg L and Meyer JP; Heat transfer and

pressure drop characteristics of angled spiralling tape inserts in a heat exchanger annulus. Heat Transfer Engineering, Vol. 24, No. 6, pp. 29 – 39, 2003.

7. Bukasa JP, Liebenberg L and Meyer JP; Heat transfer performance during condensation inside spiralled micro-fin tubes. Journal of Heat Transfer, Vol. 126, No. 3, pp 321 – 328, 2004.

8. Olivier JA, Liebenberg L, Kedzierski MA, Meyer JP; Pressure drop during refrigerant condensation inside horizontal smooth, helical micro-fin, and herringbone micro-fin tubes, Journal of Heat Transfer, Vol. 126, No. 5, pp. 687 – 696, 2004.

9. Liebenberg, Thome JR and Meyer JP. Flow visualization and flow pattern identification with powerspectral density distributions of pressure traces during refrigerant condensation in smooth and micro-fin tubes. Journal of Heat Transfer, Vol. 127, No. 3, pp. 209 – 220, 2005.

10. Bukasa JP, Liebenberg L and Meyer JP. Influence of spiral angle on heat transfer during condensation inside spiralled micro-fin tubes. Heat Transfer Engineering, Vol. 26, No. 7, pp. 11 – 21, 2005.

11. Liebenberg L and Meyer JP. The characterization of flow regimes with power spectral density distributions of pressure fluctuations during condensation in smooth and enhanced tubes. Experimental Thermal and Fluid Sciences, paper nr ETF 6794, accepted for publication in September 2005.

12. Lambrechts A, Liebenberg L, Bergles AE and Meyer JP. Heat transfer performance during condensation inside horizontal smooth, micro-fin and herringbone tubes. Journal of Heat Transfer, Vol. 128, No. 7, pp. 691- 700, 2006.

13. Ji T, Liebenberg L, Meyer JP. A flow regime map for condensing

14. Liebenberg L, Meyer JP. The characterization of flow regimes with power spectral density distributions of pressure fluctuations during condensation in smooth and micro-fin tubes. Experimental Thermal and Fluid Science, Vol. 31, pp. 127 - 140, 2006.

15. Owaga D, Liebenberg L and Meyer JP; A flow regime map for refrigerant condensation in herringbone micro-fin tubes, South African Journal of Science, Vol. 102, No. 11/12, pp. 519 - 526, 2006.

16. Liebenberg L, Meyer JP. A review of flow pattern-based predictive correlations during refrigerant condensation

in horizontally smooth and enhanced tubes. Heat Transfer Engineering, Vol. 29, No. 1, pp. 1-17, 2007.

17. Oliver JA, Liebenberg L, Thome JR, Meyer JP. Heat transfer, pressure drop, and flow pattern recognition during condensation inside smooth, helical micro-fin, and herringbone tubes. International Journal for Refrigeration, Vol. 30, No. 4, pp. 609 - 623, 2007.

18. Bello-Ochende T, Liebenberg L, Meyer JP. Constructal cooling channels for micro-channel heat sinks. International Journal of Heat and Mass Transfer, Vol. 50, No, 21-22, pp. 4141 - 4150, 2007.

19. Canière H, T’Joen C, Willockx A, De Paepe M, Christians M, Van Rooyen E, Liebenberg L, Meyer JP. Horizontal two-phase flow characterization for small diameter tubes with a capacitance sensor. Measurement Science and Technology, Vol. 18, pp. 2898 - 2906, 2007.

20. Liebenberg L, Meyer JP. In-tube passive heat transfer enhancement in the process industry. Applied Thermal Engineering, Vol. 27, pp. 2713 - 2727, 2007.

21. Liebenberg L, Meyer JP. Objective classification of two-phase flow regimes. Heat Transfer Engineering, Vol. 29, No. 1, pp. 1-2, 2007.

22. Bello-Ochende T, Liebenberg L, Malan AG, Bejan A and Meyer JP. Constructal conjugate heat transfer in three dimensional cooling channels, Journal of Enhanced Heat Transfer, Vol. 14, No. 4, pp. 1 -15, 2007.

23. Bello-Ochende T, Liebenberg L and Meyer JP. Constructal design: geometric optimisation of microchannel heat sink. SA Journal of Science, Vol. 103, No 12, pp. 483-489, 2007.

24. Liebenberg L, Meyer JP. A review of flow pattern-based predictive correlations during refrigerant condensation in horizontally smooth and enhanced tubes, Heat Transfer Engineering, Vol. 29, No. 1, pp. 3 -19, 2008.

25. Liebenberg L, Meyer JP. Objective classification of two-phase flow regimes. Heat Transfer Engineering, Vol. 29, No. 1, pp. 1-2, 2008.

26. Liebenberg L and Meyer JP. Refrigerant condensation flow regimes in enhanced tubes and their effect on heat transfer coefficients and pressure drop. Heat Transfer Engineering,Vol. 29, No. 6, pp. 506-520, 2008.

27. Ji T, Liebenberg L and Meyer JP. Heat transfer enhancement during condensation in smooth tubes with helical wire inserts, Heat Transfer Engineering, accepted on 27 November 2007 for Vol. 30, No. 5, pp. 337-352, 2009.

28. Suliman R, Liebenberg L, Meyer JP. Improved flow pattern map for accurate prediction of heat transfer

coefficients during condensation of R-134a in smooth horizontal tubes and within low-mass flux range. International Journal of Heat and Mass Transfer, Vol. 52, pp. 5701-5711, 2009.

Conference papers: 1. Liebenberg L, Krüger JJ. Computer controlled Hydrostatic Transmission with Traction Control for Vehicles. SAE Paper no 901559, Proceedings of the 1994 SAE International Off-Highway and Power Plant Congress, Milwaukee, USA, September, September 1990. 2. Liebenberg L, Nel AL, Pullen KR. Computer simulation of a gas turbine hybrid electric vehicle. SAE paper 941733, Proceedings of the 1994 SAE International Off-Highway and Power Plant Congress, Milwaukee, USA, September 1994. 3. Liebenberg L, Ankiewicz P. A programme for the promotion of technological awareness and literacy at pre-tertiary and tertiary level. Proceedings of Learning Technology 1995, SAIEE/AS&TS, University of Pretoria, August 1995. 4. Liebenberg L and Meyer JP. The viability of capacity control of high temperature heat pump water heaters operating with non-azeotropic refrigerant mixtures. Proceedings of the American Society of Mechanical Engineers and ASIA ’97 Congress, Singapore, paper no 97-AA-28 (10 pages), 30 September - 2 October 1997. 5. Liebenberg L and Meyer JP; Potential of the zeotropic mixture R-22/R-142b in high temperature heat pump water heaters with capacity modulation. ASHRAE Transactions, San Francisco, CA, USA, Vol. 104, Part 1A, Paper no 4134, pp. 418-429, 17-21 January 1998. 6. Liebenberg L. Energy-saving potential of capacity-modulated heat pump water heaters using zeotropic mixtures. Proceedings of the International Conference on Applied Mechanics, SACAM 2000, Edited by Adali, S, Morozov, E.V. and Verijenko, V.E., pp. 423 - 428, 11-13 January 2000. 7. Liebenberg L, Bergles AE and Meyer JP. A review of refrigerant condensation in horizontal micro-fin tubes. The 2001 International Mechanical Engineering Congress and Exposition, Orlando, Florida, 5 – 10 November 2001, AES-Vol. 40, pp. 155 – 168, 2000. 8. Coetzee H, Liebenberg L and Meyer JP. Heat transfer and pressure drop characteristics of angled spiralling tape inserts in a heat exchanger annulus. 2001 ASME International Mechanical Engineering Congress & Exposition (IMECE), New York, 11 – 16 November 2001. 9. Van der Hoek L, Liebenberg L and Meyer JP.

Validation of in-tube condensation performance. Proceedings of the First International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Skukuza, South Africa, Vol. 1, Part 1, pp. 236 – 241, 8 – 10 April 2002. 10. Coetzee H, Liebenberg L, Oerder SA, Van der Vyver H and Meyer JP. Heat transfer and pressure drop characteristics of angled spiralling tape inserts in a heat exchanger annulus. Proceedings of the First International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Skukuza, South Africa, Vol. 1, Part 1, pp. 476 – 481, 8 – 10 April 2002. 11. Liebenberg L, Bukasa JP, Holm K, Meyer JP and Bergles AE. Unified approach to modelling of intube condensation in smooth and micro-fin tubes. Compact Heat Exchanger Symposium, A Festchrift on the 60th Birthday of Ramesh K Shah, Grenoble, France, 24 August 2002. 12. Liebenberg L, Hofsajer I. Reverse engineering and redesign: an introductory course to systematically teach design. Proceedings of the SAIEE Workshop on Electrical Engineering at Universities and Technikons, McRae Auditorium, Eskom Convention Centre, Midrand, 14 March 2003. 13. Bukasa JPM, Liebenberg L and Meyer JP. Influence of spiral angle on heat transfer during condensation inside spiralled micro-fin tubes. Proceedings of the 2nd International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, (HEFAT2003), Livingstone, Zambia, paper no BJ1, 23 – 25 June 2003. 14. Liebenberg L and Meyer JP. Use of pressure fluctuations for flow pattern identification during condensation in smooth- and micro-fin tubes. Proceedings of the 2nd International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, (HEFAT2003), Livingstone, Zambia, paper no LL2, 23 – 25 June 2003. 15. Lambrechts A, Liebenberg L and Meyer JP. Heat transfer coefficients in a horizontal herringbone tube during in-tube condensation. Proceedings of the 2nd International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, (HEFAT2003), Livingstone, Zambia, paper nr LA2, 23 – 25 June 2003. 16. Liebenberg L and Meyer JP (keynote). Flow patterns during condensation in smooth and micro-fin tubes. Proceedings of the Fourth International Conference on Compact Heat Exchangers and

Enhancement Technology for the Process Industries, (Editors: Shah RK, Deakin AW, Honda H and Rudy TM), Crete, Greece, pp. 267 – 280, 28 September to 3 October 2003. 17. Liebenberg L (keynote). The development of flow regime maps for smooth, micro-fin, and herringbone tubes using power spectral density (PSD) distributions of the pressure signals during condensation. Fourth International Conference on Compact Heat Exchangers and Enhancement Technology for the Process Industries, Crete, Greece, 29 September 2003. 18. Liebenberg L and Meyer JP (keynote). Condensation flow regime characterization using power spectral density distributions of pressure fluctuations. Proceedings of the 3rd International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, (HEFAT2004), Cape Town, paper no K1, 21 – 24 June 2004. 19. Liebenberg L and Meyer JP (keynote). The characterization of flow regimes with power spectral density distributions of pressure fluctuations during condensation in smooth and enhanced tubes. ASME-ZSITS International Thermal Science Seminar, Bled, Slovenia, 14 June 2004. 20. Olivier, JA, Liebenberg L, and Meyer JP. Experimental Pressure Drops during Condensation Inside Smooth, Helical Micro-fin, and Herringbone Tubes using R-22, R-134a, and R-407C. Proceedings of 6th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics (ExHFT6), Matsushima, Japan, paper no 7-b-4, 17 – 21 April 2005. 21. Ji T, Liebenberg L and Meyer JP. A flow regime map during condensation in smooth tubes with helical inserts. 5th International Symposium on Multiphase Flow, Heat, Mass Transfer and Energy Conversion, Xi’an, China, paper no 067, 3 – 6 July 2005. 22. Liebenberg L, Olivier J, Thome JR and Meyer JP. Flow Pattern-based Pressure Drop Correlations for Refrigerant Condensation in Smooth and Enhanced Tubes. Proceedings of the IIR Conference: Thermophysical Properties and Transfer Processes of Refrigerants, Vicenza, Italy, 8 pages, 31 Aug – 2 Sept 2005. 23. Ji T, Holm K, Liebenberg L and Meyer JP. Visualization of water flowing through glass tubes with helical wire inserts. Proceedings of the 4th International Conference on Heat Transfer, Fluid Mechanics and

Thermodynamics, (HEFAT2005), Cairo, Egypt, paper no HK16, 19 – 22 September 2005. 24. De Paepe M, Canière H, T’Joen C, Steeman H-J, Willockx A, Christians M, Van Rooyen E, Liebenberg L and Meyer JP. Refrigerant flow regime detection with a capacitance void fraction sensor. Collection of Technical Papers - 9th AIAA/ASME Joint Thermophysics and Heat Transfer Conference Proceedings, San Francisco, paper number AIAA 2006-3130, Vol. 2, pp. 818 - 832, 5 - 8 Jun 2006. 25. Liebenberg L and Meyer JP (keynote). In search of objective heat transfer and pressure drop models. 13th International Heat Transfer Conference (IHTC-13), Sydney, Australia, Paper no KN-21, 13 - 18 August 2006. 26. Bello-Ochende T, Liebenberg L, Malan AG, Bejan A and Meyer JP. Optimal geometry for conjugate heat transfer in a cooling channel. 13th International Heat Transfer Conference (IHTC-13), Sydney, Paper no HTE-02, 13 - 18 August 2006. 27. Ji T, Liebenberg L and Meyer JP. Pressure drop during condensation in smooth tubes with a helical wire insert. 13th International Heat Transfer Conference (IHTC-13), Sydney, Paper no MPH-48, 13 - 18 August 2006. 28. Liebenberg L and Meyer JP (keynote). In-tube passive heat transfer enhancement in the process industry. 9th Conference on Process Integration, Modelling and Optimization for Energy Saving and Pollution Reduction (PRES2006), Prague, Paper no G7.1, 27 - 31 August 2006. 29. Liebenberg L and Meyer JP (keynote). Flow regime maps for enhanced tubes and their influence on condensation heat transfer and pressure drop. 17th International Conference of Chemical and Process Engineering (CHISA2006), Prague, Paper no F5.1, 27 - 31 August 2006. 30. Liebenberg L. Engendering innovation. International Engineering and Mathematics Workshop, University of Johannesburg, 28 November 2006. 31. Christians-Lupi M, van Rooyen E, Liebenberg L and Meyer JP. Flow pattern-based heat transfer correlation for condensing R-22 in a smooth tube. Proceedings of the Fifth International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics (HEFAT2007), Sun City, South Africa, paper number CM4, 1 to 4 July 2007. 32. Van Rooyen E, Christians M, Liebenberg L and Meyer JP. Optical measurement technique for predicting

time fractions in two-phase flow, Proceedings of the Fifth International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics (HEFAT2007), Sun City, South Africa, paper number VE1, 1 to 4 July 2007. 33. Bello-Ochende T and Meyer JP. Combined micro-channel heat sink optimization for cooled electronics. Proceedings of the ASME-JSME Thermal Engineering Summer Heat Transfer Conference, Vancouver, Canada, paper no HT2007-32049, 8 - 17 July 2007. 34. Liebenberg L (keynote). Reliable and objective flow pattern-based heat transfer and pressure drop models. 2nd International Forum on Heat Transfer, 17-19 Sept, Tokyo.