Numerical analysis of cooling performance of a novel structure affected by aeolian sand clogging on expressway embankment in permafrost regions

2022 ◽  
Vol 187 ◽  
pp. 122538
Author(s):  
Qinguo Ma ◽  
Xiaoxiao Luo ◽  
Fujun Niu ◽  
Weiyu Sun ◽  
Tianli Lan ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Aeolian Sand ◽  
Cooling Performance ◽  
Novel Structure ◽  
Permafrost Regions

Cooling performance of two-phase closed thermosyphons installed at a highway embankment in permafrost regions

2016 ◽  
Vol 98 ◽  
pp. 220-227 ◽  
Author(s):  
Fan Yu ◽  
Jilin Qi ◽  
Mingyi Zhang ◽  
Yuanming Lai ◽  
Xiaoliang Yao ◽  
...  
Keyword(s):  
Two Phase ◽  
Cooling Performance ◽  
Permafrost Regions ◽  
Highway Embankment

Micro-Refrigerator Fabricated on Silicon Wafer

2007 ◽  
Author(s):  
Y. Takata ◽  
K. Sugahara ◽  
T. Tachikawa ◽  
S. Moroe ◽  
H. Kubota ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Heat Exchanger ◽  
Numerical Analysis ◽  
Silicon Wafer ◽  
Flow Rate ◽  
Cooling Power ◽  
Temperature Profiles ◽  
Evaporator Temperature ◽  
Cooling Performance ◽  
Gas Pressures

A prototype Joule-Thomson micro-cooler was fabricated on silicon wafer by making use of photofabrication. The micro-cooler uses ethylene as a refrigerant and it consists mainly of heat exchanger and evaporator. The cooling power of 20mW at evaporator temperature of 272K was attained at the inlet and outlet gas pressures of 2.5MPa and 0.1MPa, respectively. To understand the low cooling performance, numerical analysis of heat exchanger has been done and the effects of mass flow rate and thermal conductivity of solid on temperature profiles and effectiveness were examined. It was found that the flow rate of present experiment is too large and the decrease in flow rate gives better temperature effectiveness of heat exchanger. It was also found that the low thermal conductivity of solid improves the performance of heat exchanger.

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