希薄流における熱線プローブの伝熱特性

概要

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The heat transfer characteristics of hot-wire sensors in rarefied gas flow have been investigated for Knudsen number K_n ranging from 0.01 to 10 while Mach number was kept constant below 0.075. The probe was mounted on a support arm which rotates in an evacuated chamber, so that the flow velocity is kept constant. The diameter of the sensor was changed from 1.25 to 10μm, covering the Reynolds number Re between 10^<-2> and 10. The Nusselt number Nu was determined from the CTA output voltage transmitted via mercury slip-ring. It has been indicated that Nu is expressed by the unique function of Re for K_n ≤ 0.06 ; the biasing effect due to the K_n-dependence of Nu can be successfully corrected using the Collis-Williams formula for 0.06 ≤ K_n ≤ 0.1. Nu is shown to be entirely independent of Re for K_n ≤ 1.3. The results have been compared with the linear solution of B-G-K equation and its validity and limit have been discussed.
社団法人日本機械学会の論文
1993-04-25