臭化リチウム水溶液膜への水蒸気吸収に及ぼす管表面形状の影響

概要

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Absorption chillers are becoming attractive since they do not use Freon gases which destroy ozone layer, and can be driven by heat. Improvement of the absorber is necessary to make absorption chillers compact. In this paper, heat transfer surfaces which show maximum absorption performance are sought. Grooved pipes are known to be effective for promoting gas absorption into falling water. They are tested for water vapor absorption with four different groove depths as well as two different knurled surfaces. The pipe with the deepest groove shows enhancement of about 1.5-1.9 in the Reynolds number range of 200-500. The knurled surfaces are not effective for the absorption, but they have better wettability at a lower flow rate and furthermore for higher knurl height, absorption increases at larger flow rate. Film thickness is measured by the contact probe method. The average film thickness curve has large undulation for deeper grooves but it is flat for the shallow grooves.
一般社団法人日本機械学会の論文
1995-04-25