Measurement of Heat Conduction through Metal Spheres

Lewis, Michael Alexander Oxenham; Radebaugh, Ray

doi:10.1007/0-306-47112-4_53

Cited by 6 publications

(1 citation statement)

References 5 publications

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“…The effective thermal conductivity is estimated by using the experimental temperature distribution on the outer surface of the regenerator, so that the value is determined to be 20% of its solid (lead) value. The conduction degradation factor of 20%, in this paper, is slightly larger than that measured by Kuriyama et al (Kuriyama, Kuriyama et al 1997) and Lewis et al (Lewis and Radebaugh 2002) which is approximately 10%. This might be due to the differences in the operating temperature range and the geometrical factor such as the porosity and the particle size.…”

Section: A Numerical Model Descriptionscontrasting

confidence: 61%

Development and experimental investigation of Stirling-type pulse tube refrigerator (PTR) below 20 K; cold compressor and colder expander

Park

Jeong

Cha

2017

International Journal of Refrigeration

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This research paper focuses on the experimental investigation of the Stirling-type pulse tube refrigerator with cold compression concept. Due to this innovative feature, the pulse tube refrigerator can reach lower temperature effectively other typical single-stage Stirling-type pulse tube refrigerators. The experiment as a proof of concept is carried out to demonstrate the capability of the pulse tube refrigerator operating between 80 K and 20 K. The cold linear compressor, which is submerged in a liquid nitrogen bath, produces cold mass flow with the efficiency of 85% for all the frequencies. At the lowest temperature part of the pulse tube refrigerator, the no-load temperature of 18.7 K is recorded and the cooling power of 0.4 W is measured at 20 K. The experimental results are analyzed in dynamic and thermal aspects by using of the numerical model. The model can well explain how much losses are distributed in the system.

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Section: A Numerical Model Descriptionscontrasting

confidence: 61%