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J4  2013, Vol. 47 Issue (12): 2253-2259    DOI: 10.3785/j.issn.1008-973X.2013.12.027
张绍志, 王宏宇, 陈光明
浙江大学制冷与低温研究所,浙江 杭州 310027
Numerical study on freezing process of  Ar-He cryoprobe
ZHANG Shao-zhi, WANG Hong-yu, CHEN Guang-ming
Institute of Refrigeration and Cryogenics,Zhejiang University,Hangzhou 310027,China
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针对氩氦刀冷冻过程建立探针内工质流动传热和病患组织生物传热的耦合物理模型,并进行数值求解.采用此模型对氩氦刀探针的冷冻过程进行非稳态模拟,发现探针外壁面温度和热流分布都不均匀,探针端部外壁面相对于中后部降温更快,热流分布则存在一段U型区域.在冷冻过程中,探针输出的总冷量先迅速增加然后逐渐减少,最后趋于稳定.同时采用此模型研究探针内部结构对冰球形成过程的影响,结果表明:对于5 mm直径探针,在供气压力相同的情况下,内部翅片间距0.3 mm比间距0.2 mm和0.5 mm时冰球生长得更快.


A coupled physical model which considering the refrigerant flow and heat transfer in the cryoprobe and the biological heat transfer in diseased tissue was established and numerically solved. The simulation revealed that the temperature and heat flux distribution on the external wall of the cryoprobe are not uniform. Temperature drop is faster at the end region, and a U-shape area exists in the spatial distribution of heat flux. During the freezing process, the refrigeration output increases steeply first, then decreases gradually, and finally tends to be stable. The impact of the internal structure of the cryoprobe was also studied. For a cryoprobe of 5 mm diameter, when the supply gas pressure was fixed, the ice ball would grow faster for 0.3 mm fin gap than for 0.2 mm and 0.5 mm fin gap.

出版日期: 2013-12-01
:  TS 255.3  


通讯作者: 陈光明,男,教授,博导.     E-mail:
作者简介: 张绍志(1972—),男,副教授,主要从事食品和生物材料冷冻/冻干保存、制冷自动化研究.E-mail:
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张绍志, 王宏宇, 陈光明. 氩氦刀冷冻过程数值模拟[J]. J4, 2013, 47(12): 2253-2259.

ZHANG Shao-zhi, WANG Hong-yu, CHEN Guang-ming. Numerical study on freezing process of  Ar-He cryoprobe. J4, 2013, 47(12): 2253-2259.


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