Cavitation in Microfliuidcs_rev1_43_share
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in Microfluidic s Kavitace v mikrofluidice Academic Year: 2015 / 2016 Martin HOLUB Supervisor: doc. Ing. Pavel RUDOLF, Ph.D. „Time is the most valuable thing a man can spend.“ Theophrastus (370–285 BC)
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Transcript of Cavitation in Microfliuidcs_rev1_43_share
Cavitation in Microfluidics
Kavitace v mikrofluidice
Academic Year:2015 / 2016
Martin HOLUBSupervisor:
doc. Ing. Pavel RUDOLF, Ph.D.
„Time is the most valuable thing a man can spend.“Theophrastus (370–285 BC)
Cavitation Microfluidics
Cavitation on hydrofoil [1] Microfluidic chip [2]
Thesis Goals
• Introduction, definition of fundamental terms
• Literature research and report on the state-of-the-art technology
• CFD for the flow in micrometer-sized channel
• Design of experiment
Cavitation Chemistry & Other Effects
Luminescence [5]
Single bubble collapse near the wall [4]
…… 𝐻2𝑂2
𝐻 • 𝑂𝐻•
𝐻2𝑂Energy
Mechanical, heat and chemical effects→ Applications
Luminescence [5]
Single bubble collapse near the wall [4]
Cavitation Chemistry & Other Effects
…… 𝐻2𝑂2
𝐻 • 𝑂𝐻•
𝐻2𝑂Energy
Mechanical, heat and chemical effects→ Applications
Luminescence [5]
Single bubble collapse near the wall [4]
…… 𝐻2𝑂2
𝐻 • 𝑂𝐻•
𝐻2𝑂Energy
Cavitation Chemistry & Other Effects
Mechanical, heat and chemical effects→ Applications
Microscale Cavitation
Bubbles completely filling microchannel [6]
Cases relevant for comparison [6], inception,
choking
𝜎=𝑝𝐷𝑆−𝑝𝑣
12𝜌𝑣𝑐
2
Device Description
0.284 0.242
0.38 0.299
0.24 0.171
0.301 0.252
Microchannel
𝑅𝑒𝑐=𝜌𝑣 ∙𝐿𝑐
𝜇 [− ]
Case No.
#1 102.5 0.365#2 130 0.415#3 158 0.465#4 186.5 0.515#5 213 0.565#6 241 0.615
Dimensions of microchannel, given in micrometers. BCs locations and types are indicated
Overview of solved cases
Solution Monitor – Vapor Fraction Fast Fourier Transform
Microchannel
Stable liquid jet surrounded by two broad and long vapor bubbles that
touch the walls [7]
Wavy pattern of cavity boundary [6]
𝜎=0.365
Microchannel
Vapor Volume Fraction Frequency
Microchannel
Millichannel
Millichannel geometry and BCs, all dimensions in micrometers
Case No.#1 14 5.67#2 20 2.95#3 60 0.53
Overview of solved cases
Vapor fraction = 0.2 in brick-
shaped chamber
𝜎=0.53
Vapor fraction in constriction,
high void fraction in red
Millichannel
Pressure dropTemperature of bubble
collapse
Source: [8]
Millichannel
Design of Experiment
Microfluidic channel with packaging module (Courtesy of D. Jasikova TUL)
Schematics of experimental setup
Design of Experiment
Main Outcomes• Recommendations for
future research work• Periodicity of solution• Strengths and weaknesses
of laminar model• Design of experimental
setup and procedure with μ-PIV
• Phases distribution• Regions of recirculation
and potential mixing• Overview of state-of-the-art
research• CFD guidelines for future
students
Sources of Images[1] FRANC, Jean-Pierre a Jean-Marie MICHEL. Fundamentals of cavitation. Dordrecht: Springer Netherlands, 2005, xxii, 300 p. ISBN 978-904-8166-183.
[2] news.stanford.edu/news/2006/january18/gifs/fluidicschip.jpg
[3] GOGATE, Parag, Irfan SHIRGAONKAR, M. SIVAKUMAR, P. SENTHILKUMAR, Nilesh VICHARE and Aniruddha PANDIT Cavitation reactors: Efficiency assessment using a model reaction. AIChE Journal [online]. Hoboken: Wiley Subscription Services, Inc., A Wiley Company, 2001, 47(11), 2526-2538 [cit. 2015-12-19]. DOI: 10.1002/aic.690471115. ISSN 00011541.
[4] brookbubble.weebly.com/uploads/7/8/1/6/78160850/5575735.gif
[5] DUPLAT, Jérôme a Emmanuel VILLERMAUX. Luminescence from Collapsing Centimeter Bubbles Expanded by Chemical Reaction. Physical review letters [online]. 2015, 115(9), 094501 [cit. 2016-
06- 06].
[6] MISHRA, C. a Y. PELES Size scale effects on cavitating flows through microorifices entrenched in rectangular microchannels. Microelectromechanical Systems, Journal of [online]. USA: IEEE, 2005, 14(5), 987-999 [cit. 2015-12-19]. DOI: 10.1109/JMEMS.2005.851800. ISSN 10577157.
[7] MISHRA, Chandan a Yoav PELES. Flow visualization of cavitating flows through a rectangular slot micro-orifice ingrained in a microchannel. Physics of Fluids [online]. AIP, 2005, 17(11), 13602-13616 [cit. 2016-04- 10]. DOI: 10.1063/1.2132289. ISSN 10706631.
[8] ROOZE, Joost, Matthieu ANDRÉ, Gert-Jan GULIK, David FERNÁNDEZ-RIVAS, Johannes GARDENIERS, Evgeny REBROV, Jaap SCHOUTEN a Jos KEURENTJES. Hydrodynamic cavitation in microchannels with channel sizes of 100 and 750 micrometers. Microfluidics and Nanofluidics [online]. Berlin/Heidelberg: Springer-Verlag, 2012, 12(1), 499-508 [cit. 2015-12-19]. DOI: 10.1007/s10404-011-0891-5. ISSN 16134982.
