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http://dx.doi.org/10.7316/KHNES.2018.29.1.105

Flow Boiling Heat Transfer Characteristics on Sintered Microporous Surfaces in a Mini-channel  

KIM, YEONGHWAN (Department of Energy Conversion Systems, Korea Institute of Machinery & Materials)
SHIN, DONG HWAN (Department of Energy Conversion Systems, Korea Institute of Machinery & Materials)
KIM, JIN SUB (Department of Energy Conversion Systems, Korea Institute of Machinery & Materials)
MOON, YOOYONG (Mechanical Design Group, Hanwha Systems)
HEO, JAEHUN (Mechanical Design Group, Hanwha Systems)
LEE, JUNGHO (Department of Energy Conversion Systems, Korea Institute of Machinery & Materials)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.29, no.1, 2018 , pp. 105-110 More about this Journal
Abstract
The flow boiling heat transfer of water was experimentally investigated on plain and sintered microporous surfaces in a mini-channel. The effects of microporous coating on flow boiling heat transfer of subcooled water were investigated in a 300 mm long mini-channel with a cross section of $20{\times}10mm^2$. The test section has sufficiently long entrance length of 300 mm which provides a fully-developed flow before the channel inlet. The bottom side of the channel was heated by a copper block assembled with a high-density cartridge heater and other sides of the channel were insulated. The microporous surface was fabricated by sintering copper particles with the average particle size of $50{\mu}m$ on the top side of the copper block. Heat transfer measurement was conducted at the mass flux of $208kg/m^2s$ and the heat flux up to $500kW/m^2$. Microporous coated surface showed an earlier boiling incipience compared with plain surface regardless of the mass flux. Microporous coating were significantly attributed to local wall temperature and local heat transfer coefficient for flow boiling.
Keywords
Flow boiling; Microporous coating; Two-phase flow; Local heat transfer coefficient;
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