ねじれ板を挿入された管内流の熱伝達特性(その2) : ねじれ板後の流れ

概要

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There are many ways to improve heat transfer on a flow in a tube. Most ways are not cheap and easy at use. A way to insert screw bar into a tube is simple and cheap. Because it can be made very easily and at use we only insert it into a tube. We can expect that it becomes to be very good system. We studied heat transfer of a flow with the screw bar experimentally and reported the results at previous paper. But we didn't discuss about a flow behind a screw in the paper. The part of a flow is important on heat transfer. Then we studied heat transfer of a flow including the part behind screw experimentally. As results, we obtain followings 1) Best twist numbers of the screw a meter are 2 or 3. 2) Heat transfer coefficient of a flow with the best twist number screw is 10 times as much as that of the flow without screw.
八代工業高等専門学校の論文
2004-03-01