TY - JOUR
T1 - Thermal spreading characteristics of novel radial pulsating heat pipes with diverging nonuniform channels
AU - Jang, Dong Soo
AU - Cho, Wonhee
AU - Ham, Se Hyeon
AU - Kim, Yongchan
N1 - Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2020R1A2C2008539 ).
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/12/15
Y1 - 2022/12/15
N2 - The heat-spreading performance of a pulsating heat pipe (PHP) can be enhanced by increasing the driving force using a novel channel structure. The objective of this study is to investigate the thermal characteristics of novel radial PHPs with diverging channels under horizontal operation. The heat spreading characteristics of radial PHPs with diverging uniform channels (PHP1) and nonuniform channels (PHP2) were measured and analyzed under various working fluids, filling ratios, and heat inputs. HFE-7100, HFE-7200, and ethanol were used as the working fluids. Furthermore, the flow patterns and pressure variations in the PHPs within a short time frame were analyzed. Based on the measured data for both PHPs, the optimum filling ratio for each working fluid was determined to achieve the maximum performance. In addition, the maximum thermal performances of PHP1 and PHP2 were evaluated, aiming to achieve the lowest thermal resistance and maximum heat flux. Overall, the thermal resistance and heat flux of PHP2 were 5.9–11.7% lower and 20–37.5% higher than those of PHP1, respectively.
AB - The heat-spreading performance of a pulsating heat pipe (PHP) can be enhanced by increasing the driving force using a novel channel structure. The objective of this study is to investigate the thermal characteristics of novel radial PHPs with diverging channels under horizontal operation. The heat spreading characteristics of radial PHPs with diverging uniform channels (PHP1) and nonuniform channels (PHP2) were measured and analyzed under various working fluids, filling ratios, and heat inputs. HFE-7100, HFE-7200, and ethanol were used as the working fluids. Furthermore, the flow patterns and pressure variations in the PHPs within a short time frame were analyzed. Based on the measured data for both PHPs, the optimum filling ratio for each working fluid was determined to achieve the maximum performance. In addition, the maximum thermal performances of PHP1 and PHP2 were evaluated, aiming to achieve the lowest thermal resistance and maximum heat flux. Overall, the thermal resistance and heat flux of PHP2 were 5.9–11.7% lower and 20–37.5% higher than those of PHP1, respectively.
KW - Flow pattern
KW - Heat spreader
KW - Radial pulsating heat pipe
KW - Thermal performance
UR - http://www.scopus.com/inward/record.url?scp=85139066116&partnerID=8YFLogxK
U2 - 10.1016/j.ijheatmasstransfer.2022.123488
DO - 10.1016/j.ijheatmasstransfer.2022.123488
M3 - Article
AN - SCOPUS:85139066116
SN - 0017-9310
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
ER -