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化工学报  2012 

氩氦刀探针的数值模拟

DOI: 10.3969/j.issn.0438-1157.2012.z2.010, PP. 53-57

Keywords: 氩氦刀,数值模拟,两相流,预冷,半导体制冷

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Abstract:

为了指导氩氦刀设计,对氩氦刀低温探针的内外部传热和J-T节流过程进行了稳态模拟,采用有限差分法,考虑了轴向传热和冷端低压流体的气液两相特征,在氩氦刀端部假设与外界恒热流换热,对流体和壁面的温度分布进行了计算,对不同进气温度下氩氦刀的制冷能力进行了比较。低压流体在换热器冷端存在气液两相,高压进气温度降低有利于制冷量提高;当高压进气温度由300K降至270K,同时维持冷刀端部有效制冷区域外壁温度基本不变的情况下,外部热流可提高20%左右;如利用半导体模块来预冷高压进气,0.001kg·s-1氩气流量用4片C1206型制冷片,冷却模块尺寸约20cm×5cm×5cm即可满足要求。

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