Experimental investigation of flow-boiling characteristics in a single micro-channel with inlet cavitation structure

Abstract

This research article investigates the effect that hydrodynamic cavitation has on flow-boiling characteristics in a single micro-channel. Flow and heat transfer characteristics have been investigated over a range of effective heat fluxes (71–330 W/cm²) and vapor quality (0.25–0.92) over a broad range of mass flow rates. The images of flow condition have been photographed. A fully developed cavitation flow, including inception, growth, and collapse of bubble, can be presented in the micro-channel. The intensity of bubble and length of the two-phase region increase with increase in the mass flow rates, and bubble flow pattern dominates the fully developed cavitation flow. Heat transfer coefficient has also been calculated at experimental conditions, and the coefficients decrease with increase in the vapor quality, but increase with increase in the heat fluxes.

Keywords

Micro-channel inlet cavitation structure flow characteristics heat transfer coefficient

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References

Tuckerman

Pease

RFW

. High-performance heat sinking for VLSI. IEEE Electr Device L1981; 2: 126–129.

Bergles

Lienhard

Kendall

. Boiling and evaporation in small diameter channels. Heat Transfer Eng2003; 24: 18–40.

Ammerman

You

. Enhancing small-channel convective boiling performance using a microporous surface coating. J Heat Transfer: T ASME2001; 123(5): 976–983.

Lee

Mudawar

. Two-phase flow in high-heat-flux micro-channel heat sink for refrigeration cooling applications: part II—heat transfer characteristics. Int J Heat Mass Tran2005; 48: 941–955.

Schneider

Koşar

Kuo

. Cavitation enhanced heat transfer in microchannels. J Heat Trans: T ASME2006; 128: 1293–1301.

Schneider

Koşar

Peles

. Hydrodynamic cavitation and boiling in refrigerant (R-123) flow inside microchannels. Int J Heat Mass Tran2007; 50: 2838–2854.

Hrnjak

Bullard

. Refrigerant 134a liquid flow through micro-scale short tube orifices with/without phase change. Exp Therm Fluid Sci2006; 30: 253–262.

Mishra

Peles

. Cavitation in flow through a micro-orifice inside a silicon microchannel. Phys Fluids2005; 17(1): 1–15.

Koşar

Kuo

Peles

. Suppression of boiling flow oscillations in parallel microchannels by inlet restrictors. J Heat Trans: T ASME2006; 128: 251–260.

10.

Cao

Tian

. Experiment investigation of R134a flow boiling process in micro-channel with cavitation structure. Heat Transfer Eng 2011; 32: 542–553.

11.

Koşar

Kuo

Peles

. Boiling heat transfer in rectangular microchannels with reentrant cavities. Int J Heat Mass Tran2005; 48: 4867–4886.

12.

Wang

Cheng

Bergles

. Effects of inlet/outlet configurations on flow boiling instability in parallel microchannels. Int J Heat Mass Tran2008; 51: 2267–2281.

13.

Xia

Chai

Zhou

. Effects of structural parameters on fluid flow and heat transfer in a microchannel with aligned fan-shaped reentrant cavities. Int J Therm Sci2011; 50: 411–419.

14.

Xia

Chai

. Influence of surfactant on two-phase flow regime and pressure drop in upward inclined pipes. J Hydrodyn2012; 24: 39–49.

15.

Soupremanien

Le Person

Favre-Marinet

. Influence of the aspect ratio on boiling flows in rectangular mini-channels. Exp Therm Fluid Sci2011; 35(5): 797–809.