ENHANCEMENT OF FORCED CONVECTIVE HEAT TRANSFER IN NARROW CONCENTRIC ANNULI BY TURBULENCE PROMOTERS |
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| Authors: | Koichi Ichimiya Shu Hasegawa |
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| Institution: | 1. Department of Mechanical Engineering , Yamanashi University , Takeda-4, Kofu, Yamanashi, 400, Japan;2. Department of Applied Nuclear Engineering , Kyushu University , Hakozaki, Higashi-ku, Fukuoka, 812, Japan |
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| Abstract: | Abstract Forced convective heat transfer in a narrow concentric annulus was enhanced by turbulence promoters to improve the heat removal from a high-temperature gas-cooled reactor, a gas-cooled fusion reactor, and other narrow flow passages. The present experiments, which differed from those performed in conventional research, were carried out to examine the effect of turbulence promoters on the inner insulated wall opposite the outer smooth heated wall. This was achieved by changing the ratio of the pitch and the height P/ε, the ratio of the height and the space ε/ε1, and the type of turbulence promoters used. Experimental results were examined for the local heat transfer coefficient distribution on the smooth outer tube, the average heat transfer coefficient, the friction factor, and the thermal performance. Five kinds of evaluations for thermal performance were carried out.P24 |
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