scholarly journals Numerical simulation study of the heat transfer characteristic in Ω-shape grooved heat pipes

2017 ◽  
Vol 205 ◽  
pp. 3916-3922
Author(s):  
Kaimin Yang ◽  
Zhuang Cong ◽  
Yudong Mao ◽  
Xiuli Zhang
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Simulation Study ◽  
Heat Transfer Characteristic ◽  
Heat Pipes ◽  
Transfer Characteristic

NUMERICAL SIMULATION OF FLOW AND HEAT TRANSFER CHARACTERISTIC OF 4K REGENERATORS AT HIGH FREQUENCY

2012 ◽  
Vol 19 ◽  
pp. 406-416
Author(s):  
ZHUOPEI LI ◽  
YANLONG JIANG ◽  
ZHIHUA GAN ◽  
LIMIN QIU
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
High Frequency ◽  
Heat Transfer Characteristic ◽  
Pressure Ratio ◽  
Transfer Characteristic ◽  
Ideal Gas ◽  
Maximum Pressure ◽  
Pulse Tube ◽  
Flow And Heat Transfer

Regenerator is a key component for all regenerative cryocoolers. 4K regenerative cryocoolers can be applied to provide cooling for low temperature superconductors, space and military infrared detectors, and medical examination etc. Stirling type pulse tube cryocoolers (SPTC), one type of regenerative cryocoolers, operate at high frequencies. As a result, SPTCs have the advantage of compact structure and low weight compared with G-M type pulse tube cryocoolers operating at low frequencies. However, as the frequency increase the thermal penetration depth of helium gas in the regenerator is greatly reduced which makes the heat transfer between the gas and the regenerator worse. In order to improve the heat transfer efficiency, regenerator materials with smaller hydraulic diameters are used. Therefore the flow resistance between the gas and the regenerator material will increase leading to larger pressure drop from the hot end to the cold end of the regenerator. The cooling performance is deteriorated due to the decreased pressure ratio (maximum pressure divided by minimum pressure) at the cold end. Also, behavior of helium at 4K deviates remarkably from that of ideal gas which has a significant influence both the flow and heat transfer characteristic within a regenerator. In this paper numerical simulation on the behavior of a 4K regenerator at high frequency is carried out to provide guidance for the optimization of the flow and heat transfer performance within a regenerator. Thermodynamic analysis of effect of the non-ideal gas behavior of helium at 4K on 4K regenerator at high frequency is investigated.

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