TED-AJ03-146 BOILING HEAT TRANSFER IN A NARROW RECTANGULAR CHANNEL OF SMALL ASPECT RATIO

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概要

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• An experimental investigation was ok conducted to elucidate boiling heat transfer and flow regime in a narrow-flat rectangular channel, 20mm wide and 100mm in the flow length, the gap of which is variable as 0.5,1.0 and 2.0mm (refer to Fig.A-1). Using R-133 as a test fluid, the influences of mass velocity, heat flux and vapor quality on heat transfer coefficient were evaluated along with an identification of flow patterns. It was found that heat transfer coefficient is a complex function of mass velocity, heat flux and vapor quality for a givens gap size (refer to Fig.A-2). The region of nucleate boiling dominance following the onset of boiling is rather short in narrow channels, and replaced by successive regimes of slug and annular flows where convective evaporation becomes dominant. Heat transfer coefficient in the bubbly flow regime is enhanced in comparison with nucleate pool boiling. Heat transfer coefficient in the slug and annular flow regimes increases in the flow direction under some conditions until dry-out[figure] quality is approached, while under another conditions heat transfer coefficient decreases steadily in the flow direction. This continuous decrease of heat transfer coefficient is considered as one of boiling heat transfer characteristics in narrow channels. It occurs when heat flux is high for a given mass velocity, i.e., when boiling number is around Bo=q/Gh_<fg>=3^*(10)^<-3>. A smaller gap size of narrow channels gives higher heat transfer coefficients at low heat fluxes, while deterioration of heat transfer begins at lower quality as heat flux becomes higher. Five flow patterns are identified : (a) bubbly flow of spherical bubble, (b) bubbly flow of two-dimensionally flattened bubble, (c) slug and bubbly flow, (d) slug flow, and (e) annular flow. Flow pattern transition from the bubbly to the slug and annular flows occurs at lower quality as the gap size is decreased. Thus the length of the bubbly flow, i.e., the region of nucheate boiling dominance is limited to the saturated region of low vapor quality less than 0.2 at most.[figure]

• 一般社団法人日本機械学会の論文

著者

• YANG Yang

  Department of Biochemistry and Molecular Biology, Peking University Health Science Center

• Fujita Yasunobu

  Department Of Energy And Mechanical Engineering Faculty Of Engineering Kyushu University

• Fujita Yasunobu

  Department Of Mechanical Engineering Science Kyusyu University

• FUJITA NAMI

  Department of Mechanical Engineering Science, Kyusyu University

• Fujita Nami

  Department Of Mechanical Engineering Science Kyusyu University

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