Modeling and Analysis of Flow Through the Orifice of Still in Dilution Refrigerator

IF 1.1 3区物理与天体物理 Q4 PHYSICS, APPLIED

Journal of Low Temperature Physics Pub Date : 2024-05-28 DOI:10.1007/s10909-024-03157-3

De-Ming Wang, Wei-Pei Cha, Wei-Dong Ding, Dong-Ming Xu, Wan-Long Han, Jian-Xin Lu, Qin Zhan

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Abstract

The cooling capacity of a typical dilution refrigerator is mainly determined by the circulating flow of the He-3 in the system, which is usually realized by the external circulation pump. In order to increase the concentration of circulating He-3, the still often take the orifice structure to limit the influence of the superfluid helium film, and this structure will also have a certain impact on the flow rate of He-3. This paper summarizes the flow rate models of each part of the orifice structure, and establishes a model related to the influence of pumping speed and the diameter of orifice on the flow rate of circulating He-3. The relationship between pumping speed and flow rate is developed and the relation is divided into three phases for detailed analysis. It is found that the flow rate and the concentration of circulating He-3 increase first and then decrease with the increasing diameter of orifice at a certain pumping speed, and the possible reasons for this phenomenon are analyzed. The results indicate that there is an optimal orifice diameter at a determined pumping speed.

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稀释冰箱蒸馏器孔口流量建模与分析

典型稀释制冷机的制冷量主要取决于系统中 He-3 的循环流量，通常由外部循环泵实现。为了提高循环 He-3 的浓度，仍常采取孔板结构来限制超流体氦膜的影响，这种结构也会对 He-3 的流速产生一定的影响。本文总结了孔板结构各部分的流量模型，建立了泵送速度和孔板直径对循环 He-3 流量影响的相关模型。建立了泵送速度与流量之间的关系，并将该关系分为三个阶段进行详细分析。研究发现，在一定的抽气速度下，随着孔径的增大，循环 He-3 的流量和浓度先增大后减小，并分析了造成这种现象的可能原因。结果表明，在确定的泵送速度下，存在一个最佳孔径。

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来源期刊

Journal of Low Temperature Physics 物理-物理：凝聚态物理

CiteScore

3.30

自引率

25.00%

发文量

245

审稿时长

1 months

期刊介绍： The Journal of Low Temperature Physics publishes original papers and review articles on all areas of low temperature physics and cryogenics, including theoretical and experimental contributions. Subject areas include: Quantum solids, liquids and gases; Superfluidity; Superconductivity; Condensed matter physics; Experimental techniques; The Journal encourages the submission of Rapid Communications and Special Issues.