RT Journal Article
ID 24f5d4981e7cdf12
A1 Agartan, Yigit Ata
A1 Yazicioglu, Almila G. 
T1 EXPERIMENTAL COMPARISON OF THE HEAT TRANSFER PERFORMANCE OF MICROCHANNEL GEOMETRIES
JF Heat Pipe Science and Technology, An International Journal
JO HPST
YR 2011
FD 2011-12-01
VO 2
IS 1-4
SP 13
OP 26
K1 microchannel
K1 forced convection two-phase heat transfer
K1 refrigerant
K1 R134a
K1 constant wall temperature
AB 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.
PB Begell House
LK https://www.dl.begellhouse.com/journals/4b0844fc3a2ef17f,281a8ea578f5d779,24f5d4981e7cdf12.html