Electronic devices such as battery packs in electric vehicles and LED lights require advanced control in temperature uniformity for their optimum performance and prolonged lifetime. Flow boiling heat transfer of subcooled water (∆Tsub = 20K) in a 300 mm long minichannel with the cross section of 20×10 mm2 was investigated to improve the temperature uniformity over the entire minichannel. The minichannel was uniformity heated from the bottom copper surface. A 10 mm thick Pyrex glass was used for the top plate of the channel to visualize two-phase flow during the experiment. Microporous coating was fabricated by sintering copper particles on the top surface of the copper block. The average particle size was 50 μm, the average coating thickness was 300 μm, and the porosity was 41%, respectively. At the heat flux of 100 kW/m2, more bubbles are shown on the microporous surface compared with plain surface, resulting in better boiling heat transfer performance. These bubbles were large and stationary as liquid is evaporated and condensed to transport the heat as if heat pumps. As heat flux increases, bubble nucleation becomes more intensive, however, the larger stationary bubbles observed at 100 kW/m2 started to decrease. Most of the generated bubbles flowed through the downstream and they shrank quickly upon departure from the wall due to the 20K subcooling. High speed video showed some streaks of these small bubbles, and more streaks were observed as the heat flux increased. As shown in the left graph above, at 50 kW/m2 in subcooled flow boiling, both plain and microporous surfaces show similar local wall temperature because both are placed in the single-phase regime. In contrast, the difference of wall superheat between plain and porous surface is relatively large at higher heat flux of 500 kW/m2. Sintered microporous surface showed smaller increase in wall superheat compared with plain surface at higher wall superheat. [This study was supported by National Research Council of Science and Technology (NST) grant, Korea (Grant No. KIMM-NK203B)].
Skip Nav Destination
Article navigation
Photo Gallery
Flow Boiling Heat Transfer of Subcooled Water on Sintered Microporous Surfaces
Yeonghwan Kim,
Yeonghwan Kim
Department of Extreme Thermal Systems, Korea Institute of Machinery and Materials, Daejeon, Korea
Search for other works by this author on:
Junsub Kim,
Junsub Kim
Department of Extreme Thermal Systems, Korea Institute of Machinery and Materials, Daejeon, Korea
Search for other works by this author on:
Seung M. You,
Seung M. You
Mechanical Engineering Department, University of Texas at Dallas, Richardson, USA
Search for other works by this author on:
Jungho Lee,
Jungho Lee
Department of Extreme Thermal Systems, Korea Institute of Machinery and Materials, Daejeon, Korea
jungho@kimm.re.kr
jungho@kimm.re.kr
Search for other works by this author on:
Jeong Lak Sohn,
Jeong Lak Sohn
Extreme Mechanical Engineering Research Division, Korea Institute of Machinery and Materials, Daejeon, 34103, Korea
Search for other works by this author on:
Jungho Lee
Jungho Lee
Extreme Mechanical Engineering Research Division, Korea Institute of Machinery and Materials, Daejeon, 34103, Korea
jungho@kimm.re.kr
jungho@kimm.re.kr
Search for other works by this author on:
Yeonghwan Kim
Department of Extreme Thermal Systems, Korea Institute of Machinery and Materials, Daejeon, Korea
Junsub Kim
Department of Extreme Thermal Systems, Korea Institute of Machinery and Materials, Daejeon, Korea
Seung M. You
Mechanical Engineering Department, University of Texas at Dallas, Richardson, USA
Jungho Lee
Department of Extreme Thermal Systems, Korea Institute of Machinery and Materials, Daejeon, Korea
jungho@kimm.re.kr
jungho@kimm.re.kr
Jeong Lak Sohn
Extreme Mechanical Engineering Research Division, Korea Institute of Machinery and Materials, Daejeon, 34103, Korea
Jungho Lee
Extreme Mechanical Engineering Research Division, Korea Institute of Machinery and Materials, Daejeon, 34103, Korea
jungho@kimm.re.kr
jungho@kimm.re.kr
J. Heat Transfer. Aug 2017, 139(8): 080906
Published Online: June 5, 2017
Article history
Received:
April 1, 2017
Revised:
April 28, 2017
Citation
Kim, Y., Kim, J., M. You, S., Lee, J., Sohn, J. L., and Lee, J. (June 5, 2017). "Flow Boiling Heat Transfer of Subcooled Water on Sintered Microporous Surfaces." ASME. J. Heat Transfer. August 2017; 139(8): 080906. https://doi.org/10.1115/1.4036883
Download citation file:
1,488
Views
Get Email Alerts
Cited By
Noncontact SThM Thermal Conductivity Measurements of GeSbTe Thin Films Sputtered on Silicon and Glass Substrates
J. Heat Mass Transfer (March 2025)
Stability of Tollmien–Schlichting Modes in Magnetohydrodynamic Boundary Layer Flow in Porous Medium: Energy Budget Analysis
J. Heat Mass Transfer (June 2025)
A Voyage Intersecting Nano, Heat, and Energy: Professor Gang Chen’s Scientific Contributions
J. Heat Mass Transfer (March 2025)
Related Articles
Numerical Simulation of Evaporating Two-Phase Flow in a High-Aspect-Ratio Microchannel with Bends
J. Heat Transfer (August,2017)
Flow Visualization of Submerged Steam Jet in Subcooled Water
J. Heat Transfer (February,2016)
Heat Transfer Photogallery
J. Heat Transfer (February,2017)
Nucleate Boiling Heat Transfer on Plain and Microporous Surfaces in Subcooled Water
J. Heat Transfer (August,2017)
Related Proceedings Papers
Related Chapters
Liquid Cooled Systems
Thermal Management of Telecommunication Equipment, Second Edition
Thermal Design Guide of Liquid Cooled Systems
Thermal Design of Liquid Cooled Microelectronic Equipment
Liquid Cooled Systems
Thermal Management of Telecommunications Equipment