Estimation of Kapitza conductance effect on steady and transient boiling heat transfer in He I based on Kapitza conductance results in He II
✍ Scribed by M. Shiotsu; K. Hata; Y. Takeuchi; K. Hama; A. Sakurai
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 791 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0011-2275
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✦ Synopsis
Kapitza conductance in steady and transient boiling heat transfer on a horizontal 0.2mm diameter test wire was estimated based on the measured Kapitza conductance value for the same surface in He II. The He II experiments performed are for liquid temperatures ranging from 1.8 to 2.1 K under atmospheric pressure, and the He I experiments of the steady and transient heat transfer caused by exponential heat inputs are for the periods ranging from 0.2 ms to 10 s under saturated conditions at liquid temperatures ranging from 2.2 to 4.2 K, and subcooled conditions for the subcooling of 1.0 and 2.0 K at atmospheric pressure. The Kapitza conductance in He I is higher for higher saturation temperatures but little dependent upon heat flux, liquid subcooling, and heat input increasing rate. The temperature drop due to the Kapitza conductance for the wall superheat becomes more significant with the increase in heat flux and in saturation temperature. It was confirmed that the Kapitza conductance in He I can be estimated correctly based on the Kapitza conductance value for the same surface in He II.