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Heat Pipe Science and Technology, An International Journal

ISSN 印刷: 2151-7975
ISSN オンライン: 2151-7991

Archives: Volume 1, 2010 to Volume 8, 2017

Heat Pipe Science and Technology, An International Journal

DOI: 10.1615/HeatPipeScieTech.v2.i1-4.30
pages 13-26

EXPERIMENTAL COMPARISON OF THE HEAT TRANSFER PERFORMANCE OF MICROCHANNEL GEOMETRIES

Yigit Ata Agartan
Mechanical Engineering Department, Middle East Technical University, 06800 Ankara, Turkey
Almila G. Yazicioglu
Mechanical Engineering Department, Middle East Technical University, 06800 Ankara, Turkey

要約

In this work, heat transfer for the two-phase refrigerant flow inside three microchannels has been experimentally investigated for use in evaporators of refrigerators. Current literature shows that the low mass flow rates and the constant wall temperature approach common to refrigerator applications is not of general interest in the investigation of flows in microtubes and microchannels. As a result of this observation, first, an experimental setup has been constructed to test the two-phase flow of R134a in three different microchannels in terms of heat transfer performance. For different quality and saturation temperature conditions, the experimental two-phase forced convection heat transfer coefficient of the refrigerant has been determined. Two-phase flow and quality values of the saturated refrigerant have been adjusted with the use of a winding cable preheater. A gear pump has been used to adjust the uniform low mass flow rates. A secondary cycle of water-ethylene glycol mixture has been used to keep the wall temperature of the test section constant. A concentric counter flow heat exchanger has been used in the test section to maintain the heat transfer to the refrigerant. For the three microchannels, the heat transfer coefficient for the refrigerant has been determined for constant mass flux and constant average quality conditions. As a result of data analysis, it has been seen that the seven-port grooved microchannel has the best heat transfer performance.


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