TY - JOUR
T1 - Direct local heat flux measurement during water flow boiling in a rectangular minichannel using a MEMS heat flux sensor
AU - Morisaki, Masanori
AU - Minami, Shota
AU - Miyazaki, Koji
AU - Yabuki, Tomohide
N1 - Funding Information:
This study was supported by the Grant-in-Aid for Young Scientists (18K13706) and JST PRESTO (JPMJPR17I8). The authors would like to thank Mr. Shuzo Takeuchi and Mr. Hideyuki Ando at FAIS (Kitakyushu Foundation for the Advancement of Industry, Science and Technology) for their help during the fabrication process of the MEMS sensor.
Publisher Copyright:
© 2020 Elsevier Inc.
PY - 2021/2/1
Y1 - 2021/2/1
N2 - Heat transfer characteristics of water flow boiling in a minichannel were investigated through the direct measurement of local heat flux using a fabricated MEMS heat flux sensor with a multi-layered structure. Local temperatures and heat fluxes in the water flow boiling were measured at a sampling frequency of 10 kHz in synchronism with the high-speed visualization of the boiling behavior. The measurement results revealed fundamental heat transfer processes, including thin liquid film evaporation, dry-out of the liquid film, transient heat conduction after dry patch rewetting, and single-phase forced convection. The thin liquid film evaporation indicated a high local heat flux that was well over 1 MW/m2 and provided a dominant contribution to the wall heat transfer. Furthermore, the post-rewetting transient heat conduction indicated a high heat flux that was higher than 1 MW/m2. However, it was insignificant in terms of the overall wall heat transfer at all the tested heat fluxes because of its short duration. The contribution of liquid-phase forced convection was also small, except at low vapor qualities.
AB - Heat transfer characteristics of water flow boiling in a minichannel were investigated through the direct measurement of local heat flux using a fabricated MEMS heat flux sensor with a multi-layered structure. Local temperatures and heat fluxes in the water flow boiling were measured at a sampling frequency of 10 kHz in synchronism with the high-speed visualization of the boiling behavior. The measurement results revealed fundamental heat transfer processes, including thin liquid film evaporation, dry-out of the liquid film, transient heat conduction after dry patch rewetting, and single-phase forced convection. The thin liquid film evaporation indicated a high local heat flux that was well over 1 MW/m2 and provided a dominant contribution to the wall heat transfer. Furthermore, the post-rewetting transient heat conduction indicated a high heat flux that was higher than 1 MW/m2. However, it was insignificant in terms of the overall wall heat transfer at all the tested heat fluxes because of its short duration. The contribution of liquid-phase forced convection was also small, except at low vapor qualities.
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U2 - 10.1016/j.expthermflusci.2020.110285
DO - 10.1016/j.expthermflusci.2020.110285
M3 - Article
AN - SCOPUS:85095786952
SN - 0894-1777
VL - 121
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
M1 - 110285
ER -