Measurement of Cryogenic Thermal Contact Resistance of Brass by Lamination Method

doi:10.16183/j.cnki.jsjtu.2021.394

Abstract

Abstract:

Prior studies on cryogenic thermal contact resistance (TCR) measurement mainly focus on liquid nitrogen temperature region and above. There are limited solid TCR data in the lower temperature region. The present measurement is based on an RDK-408D2 two-stage G-M cryogenic refrigerator. By using the laminated method, the TCR data of brass samples in the temperature range of 10—30 K at different roughnesses and preloads are measured and the influence of different factors on TCR is discussed. The results show that the TCR of the brass contact surface in this temperature zone is between 6.89×10^-4 and 1.86×10^-2 m²·W/K. With a smaller roughness of the contact surface, higher temperature, and greater pre-tightening force, the TCR becomes smaller. This behavior is consistent with the conventional qualitative understanding. The above cryogenic experimental data can provide certain support for the calculation of TCR for related cryogenic application design.

Key words: thermal contact resistance (TCR), cryogenic, cryocooler, brass, lamination method, measurement

CLC Number:

TB61
O 514.2

SHEN Yi, CAO Jiaxing, HUANG Yonghua. Measurement of Cryogenic Thermal Contact Resistance of Brass by Lamination Method[J]. Journal of Shanghai Jiao Tong University, 2023, 57(1): 76-83.

Figures/Tables 12

Fig.1

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Tab.1

Main equipment and devices

设备和部件	型号	数量	精度
真空泵	PFEIFFER HiCube 80 Eco	1	10^-4 Pa
冰点仪	OMEGA TRCIII-A	1	0.1 K
温控仪	Lake Shore Model 335	1	±0.01 K
数据采集仪	Keysight 34972A	1	6 $12$ 位
热电偶	OMEGA TT-T-36	8	0.1 K
加热器	非标定制25 Ω加热棒	1	25±0.5 Ω
标准温度计	LakeShore CX-1070-CU-HT	2	0.05 K
数据采集终端	Lenovo ThinkPad T410	1
扭力扳手	ADEMA数显式扳手	1	±2%
穿仓引线	26芯电缆线	1
一级冷屏	镀镍铜屏	1	厚1 mm
真空罩	铝制	1

Tab.1

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Tab.2

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Ra	M/(N·m)	T/K
1.6	1.0	10~30
3.2	0.8, 1.0, 1.2, 1.4	10~30
6.3	1.0	10~30