J056032 微細気泡を含む管内気液二相流の流動伝熱特性([J05603]乱流における運動量,熱,物質の輸送現象(3))

概要

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It is known that small quantities of surfactant additives can greatly reduce the friction factors during the flow of a heat transfer medium. The friction factors are reduced because the generation of turbulent vortices is suppressed by the formation of rod-like micelles, and the flow remains laminar in the high Reynolds number range. However, the values of heat transfer coefficients decrease during flow laminarization. The research objective is to study the heat transfer enhancement effect of micro-bubble injection. This paper presents an experimental investigation of the heat transfer and flow characteristics of an air-surfactant solution two-phase flow through a vertical pipe. In the experiment, micro-bubble was injected through three types of porous metal. The experimental results are as follows. The heat transfer coefficient is promoted by micro-bubble injection, but the effect depends on the flow rate for air-water two-phase flow or the size of micro-bubble. The Effect of Heat transfer enhancement in small size bubble injection is more effective than that in large size bubble injection.
一般社団法人日本機械学会の論文
2011-09-11