編込み細線を有する極細管熱交換器

概要

論文の詳細を見る
A new-type compact heat exchanger has been suggested, and the fundamental heat transfer performance has been studied chiefly from experimental aspects. The design concept is based on the new principles for heat transfer enhancement, namely, "reducing the size of heat transfer surfaces" and "arranging a couple of turbulence promoters to cause drastic change in turbulence structure". To satisfy such requirements, the heat exchanger consists of fine tubes (o. d.- 1 mm) and woven threads (d.- 0.3 mm) : the latter play a combined role of both turbulence promoter and fin. The maximum heat transfer coefficient obtained in the experiment is fourteenfold larger than that around a cylinder without threads. Since the fin-effect contribution to the heat transfer enhancement is theoretically estimated to be less than tenfold, the turbulence-promoter effect is also considered significant. Owing to the combination of the woven threads and the very small characteristic length, the heat transfer coefficient per unit projected area is about 5 × 10^3 W/(m^2K), and that per unit volume reaches 3 × 10^6W/ (m^3K).
一般社団法人日本機械学会の論文
1990-10-25