Experimental Investigation of Lateral Heat Transfer in Cryogenic Multilayer Insulation
Lateral heat transfer along two parallel conducting and radiating plates, separated by an interstitial medium (i.e., spacer), plays an important role in the thermal performance of cryogenic multilayer insulation . Approximate theoretical analyses of this problem have been reported for the case of no spacers and for that with absorbing and scattering dielectric spacers [2,3]. Existing experimental investigations of this problem have been limited to those of Coston and Vliet [4,5] and Androulakis and Kosson [6,7]. While some results of the former do agree reasonably with the theoretical predictions in the case of no spacers , there still appears to be a considerable amount of experimental uncertainty involved in their rather preliminary investigations. The results of Androulakis and Kosson cannot be effectively compared owing to the complex geometry of their test sample and the lack of pertinent information. In order to substantiate the theoretical predictions through measurements, it is essential that the experiment simulate theory as closely as possible. It is the purpose of the present paper to obtain definitive measurements of lateral heat transfer in cryogenic multilayer insulation.
KeywordsEffective Thermal Conductivity Lower Plate Aluminum Film Platinum Resistance Thermometer Radiation Contribution
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