Jason Lam z3252911 Supervisors: Dr Victoria Timchenko A/Prof. Guan Heng Yeoh.
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Transcript of Jason Lam z3252911 Supervisors: Dr Victoria Timchenko A/Prof. Guan Heng Yeoh.
![Page 1: Jason Lam z3252911 Supervisors: Dr Victoria Timchenko A/Prof. Guan Heng Yeoh.](https://reader035.fdocuments.us/reader035/viewer/2022062518/56649e795503460f94b79107/html5/thumbnails/1.jpg)
Numerical Study of Heat Transfer Enhancement in Microchannels
Jason Lam
z3252911
Supervisors:
Dr Victoria Timchenko
A/Prof. Guan Heng Yeoh
![Page 2: Jason Lam z3252911 Supervisors: Dr Victoria Timchenko A/Prof. Guan Heng Yeoh.](https://reader035.fdocuments.us/reader035/viewer/2022062518/56649e795503460f94b79107/html5/thumbnails/2.jpg)
Problem Definition• Microchannels
• Operating frequency increases with
technological advancement
• Heat generation rates hamper
advancement
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Problem Definition• Microchannels
• Applications
• Micro-channel
Heat Exchanger
• Features/Limitations
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Features of microchannelsParameter Shell and tube heat
exchanger
Compact heat
exchanger
Micro-channel heat
exchanger
Surface area per unit
volume (m2· m-3)
50 – 100 850 – 1000 >1500
Heat transfer coefficient
(liquid) (W•m-2•K-1)
~ 5000
(tube side)
3000 – 7000 >7000
Heat transfer coefficient
(gas) (W•m-2•K-1)
20 – 100 50 – 300 400 – 2000
Approach Temperature (°C) ~ 20°C ~ 10°C <10°C
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Limitations of microchannelsParameter
Shell and tube
heat exchanger
Compact heat
exchanger
Micro-channel heat
exchanger
Flow Regime
Turbulent Turbulent Laminar
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Features of microchannels
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Synthetic Jet Displacement
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AnalysisNumerical Experimental
Institution University of New South WalesThe Institute of Thermomechanics
ASCR
Person Jason Lam Zdeněk Trávníček
Transport
phenomenaHeat Transfer (Temperature) Mass Transfer (Concentration)
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Geometry
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Geometry
• 2 Cavities
• 4 Orifices
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CFX Mesh
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CFX Mesh
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Special Thermal/Mass Boundary Condition
Numerical Experimental
Source Ts = 25°C Naphthalene Sample
Location Partially applied at the bottom of the channel
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Synthetic Jet Displacement
𝑌=𝑌𝑚𝑎𝑥 sin (2𝜋 𝑓𝑡 )
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Results – Steady State Heat Transfer
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Results – Steady State Heat Transfer
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Results – Steady State Heat Transfer
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Results – Transient Heat Transfer
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Results – Heat Transfer (Comparison)
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Results –Heat Transfer (Comparison)
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Results – Fluid Flow (Comparison)
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Results – Fluid Flow (Comparison)
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Results – Fluid Flow (Comparison)
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Conclusions
• Numerical data has been validated with the experiment with
fair agreement
• The synthetic jet is a feasible method for promoting mixing
and enhancing heat transfer
• Most appropriate method for cooling microchips.
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Questions?