Study on flow and heat transfer performance and entropy generation in concave-convex channel with frustum of a cone
In order to improve the structural strength of heat exchanger and reduce the contact thermal resistance,a new concave-convex plate of frustum of a cone with hot stamping process was proposed.Numerical studies were carried out on the concave-convex structure channels of frustum of a cone with diameter height ratio of 3,6 and 12 and on those of cylinder and spherical shape structure with diameter height ratio of 6.The flow and heat transfer performance and entropy generation distribution of channels with one and two concave-convex surfaces under different Reynolds numbers were studied.The results showed that the heat transfer distribution on the heat transfer wall of channels with one and two concave-convex surfaces was similar,but the flow and heat transfer performance of the former was better than that of the latter.When the Reynolds number increased from 5 000 to 20 000,the friction coefficient ratio and comprehensive heat transfer factor increased with the increasing diameter height ratio of frustum of a cone.When the diameter height ratio was constant,the comprehensive heat transfer factor of the channel was a spherical shape,frustum of a cone and cylinder concave-convex structure from large to small.In addition,the ratio of heat transfer and friction entropy generation decreased with the increase of Reynolds number.
concave-convex structure of frustum of a coneheat transfer performancecomprehensive heat transfer factorheat transfer entropy generationfriction entropy generation
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