The influence of surface roughness on flow boiling heat transfer and pressure drop in microchannels is experimentally explored. The microchannel heat sink employed in the study consists of ten parallel, 25.4 mm long channels with nominal dimensions of . The channels were produced by saw-cutting. Two of the test piece surfaces were roughened to varying degrees with electrical discharge machining (EDM). The roughness average varied from for the as-fabricated, saw-cut surface to and for the two roughened EDM surfaces. Deionized water was used as the working fluid. The experiments indicate that the surface roughness has little influence on boiling incipience and only a minor impact on saturated boiling heat transfer coefficients at lower heat fluxes. For wall heat fluxes above , the two EDM surfaces ( and ) have similar heat transfer coefficients that were 20–35% higher than those measured for the saw-cut surface . A modified Bertsch et al. [2009, “A Composite Heat Transfer Correlation for Saturated Flow Boiling in Small Channels,” Int. J. Heat Mass Transfer, 52, pp. 2110–2118] correlation was found to provide acceptable predictions of the flow boiling heat transfer coefficient over the range of conditions tested. Analysis of the pressure drop measurements indicates that only the roughest surface has an adverse effect on the two-phase pressure drop.
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e-mail: sureshg@purdue.edu
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December 2009
Research Papers
Surface Roughness Effects on Flow Boiling in Microchannels
Benjamin J. Jones,
Benjamin J. Jones
NSF Cooling Technologies Research Center, School of Mechanical Engineering, and Birck Nanotechnology Center,
Purdue University
, 585 Purdue Mall, West Lafayette, IN 47907-2088
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Suresh V. Garimella
Suresh V. Garimella
NSF Cooling Technologies Research Center, School of Mechanical Engineering, and Birck Nanotechnology Center,
e-mail: sureshg@purdue.edu
Purdue University
, 585 Purdue Mall, West Lafayette, IN 47907-2088
Search for other works by this author on:
Benjamin J. Jones
NSF Cooling Technologies Research Center, School of Mechanical Engineering, and Birck Nanotechnology Center,
Purdue University
, 585 Purdue Mall, West Lafayette, IN 47907-2088
Suresh V. Garimella
NSF Cooling Technologies Research Center, School of Mechanical Engineering, and Birck Nanotechnology Center,
Purdue University
, 585 Purdue Mall, West Lafayette, IN 47907-2088e-mail: sureshg@purdue.edu
J. Thermal Sci. Eng. Appl. Dec 2009, 1(4): 041007 (9 pages)
Published Online: June 24, 2010
Article history
Received:
May 18, 2009
Revised:
February 26, 2010
Online:
June 24, 2010
Published:
June 24, 2010
Citation
Jones, B. J., and Garimella, S. V. (June 24, 2010). "Surface Roughness Effects on Flow Boiling in Microchannels." ASME. J. Thermal Sci. Eng. Appl. December 2009; 1(4): 041007. https://doi.org/10.1115/1.4001804
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