Explosive boiling of water in parallel micro-channels

The objective of this study is to visualize the flow pattern and to measure heat transfer coefficient during explosive boiling of water in parallel triangular micro-channels. Tests were performed in the range of inlet Reynolds number 25–60, mass flux 95–340 kg/m 2 s, and heat flux 80–330 kW/m 2 . The flow visualization showed that the behavior of long vapor bubbles, occurring in a micro-channel at low Reynolds numbers, was not similar to annular flow with interposed intermitted slugs of liquid between two long vapor trains. This process may be regarded as explosive boiling with periodic wetting and dryout. In the presence of two-phase liquid–vapor flow in the micro-channel, there are pressure drop oscillations, which increase with increasing vapor quality. This study shows strong dependence of the heat transfer coefficient on the vapor quality. The time when liquid wets the heated surface decreases with increasing heat flux. Dryout occurs immediately after venting of the elongated bubble. � 2005 Published by Elsevier Ltd.

[1]  I. Mudawar,et al.  Flow boiling heat transfer in two-phase micro-channel heat sinks--II. Annular two-phase flow model , 2003 .

[2]  Ziping Feng,et al.  Two-phase flow in microchannels , 2002 .

[3]  W. H. McAdams,et al.  Heat Transfer at High Rates to Water with Surface Boiling , 1949 .

[4]  W. Rohsenow,et al.  Handbook of Heat Transfer Fundamentals , 1985 .

[5]  Borut Mavko,et al.  Effect of axial conduction on the heat transfer in micro-channels , 2004 .

[6]  R. Shah,et al.  Fluid Flow and Heat Transfer at Micro- and Meso-Scales With Application to Heat Exchanger Design , 2000 .

[7]  A. Mosyak,et al.  Nonuniform Temperature Distribution in Electronic Devices Cooled by Flow in Parallel Microchannels , 2000, Packaging of Electronic and Photonic Devices.

[8]  Mark E. Steinke,et al.  Flow Boiling and Pressure Drop in Parallel Flow Microchannels , 2003 .

[9]  John R. Thome,et al.  Heat Transfer Model for Evaporation in Microchannels, Part I: Presentation of the Model , 2004 .

[10]  Nobuhide Kasagi,et al.  Forced convective boiling heat transfer in microtubes at low mass and heat fluxes , 2003 .

[11]  Albert Mosyak,et al.  Two-phase flow patterns in parallel micro-channels , 2003 .

[12]  J. Thome,et al.  Convective boiling and condensation - Third edition , 1994 .

[13]  S. Kandlikar,et al.  An Extension of the Flow Boiling Correlation to Transition, Laminar, and Deep Laminar Flows in Minichannels and Microchannels , 2004, Proceeding of Compact Heat Exchangers and Enhancement Technology for the Process Industries - 2003.

[14]  M. W. Wambsganss,et al.  Two-phase pressure drop, boiling heat transfer, and critical heat flux to water in a small-diameter horizontal tube , 2002 .

[15]  S. Kandlikar.  A General Correlation for Saturated Two-Phase Flow Boiling Heat Transfer Inside Horizontal and Vertical Tubes , 1990 .

[16]  John R. Thome,et al.  Heat Transfer Model for Evaporation in Microchannels, Part II: Comparison with the Database , 2004 .

[17]  Satish G. Kandlikar.  Heat Transfer Mechanisms During Flow Boiling in Microchannels , 2004 .

[18]  Huiying Wu,et al.  Visualization and measurements of periodic boiling in silicon microchannels , 2003 .

[19]  Albert Mosyak,et al.  A uniform temperature heat sink for cooling of electronic devices , 2002 .

[20]  Albert Mosyak,et al.  Surface temperature measurement of a heated capillary tube by means of an infrared technique , 2003 .

[21]  S. Kandlikar,et al.  Control and effect of dissolved air in water during flow boiling in microchannels , 2004 .

[22]  H. Park,et al.  Rayleigh–Bénard convection of viscoelastic fluids in arbitrary finite domains , 2004 .

[23]  Huiying Wu,et al.  Boiling instability in parallel silicon microchannels at different heat flux , 2004 .

[24]  I. Mudawar,et al.  Flow boiling heat transfer in two-phase micro-channel heat sinks––I. Experimental investigation and assessment of correlation methods , 2003 .

[25]  Forced Convection Boiling in a Microchannel , 2001 .

[26]  Andrea Prosperetti,et al.  Growth and collapse of a vapor bubble in a narrow tube , 2000 .

[27]  Kiyofumi Moriyama,et al.  Thickness of the Liquid Film Formed by a Growing Bubble in a Narrow Gap Between Two Horizontal Plates , 1996 .

[28]  J. Thome,et al.  Convective Boiling and Condensation , 1972 .

[29]  Murat Bulut,et al.  An Experimental Investigation on Flow Boiling of Ethylene-Glycol/ Water Mixtures , 2003 .

[30]  T. Kenny,et al.  Measurements and modeling of two-phase flow in microchannels with nearly constant heat flux boundary conditions , 2002 .

[31]  Satish G. Kandlikar,et al.  Fundamental issues related to flow boiling in minichannels and microchannels , 2002 .