シャープターンをもつ長方形流路内の局所熱(物質)伝達特性 : 流路入口形状の影響

概要

論文の詳細を見る
Heat/mass tranfer characteristics in rectangular cross-sectioned serpentine ducts with a sharp 180-degree turn have been measured by the naphthalene sublimation method, directing special attention to the influence of the flow-inlet condition on the local mass transfer. The test duct has relatively short straight sections, (7.9〜9.1) d_h, before and after the turn. Two contrasrive flow-inlet conditions, contracted-flow inlet and uniform-flow inlet, have been tested for three turn clearances at Reynolds number of 3.5×10^4. The distributions of local Sherwood numbers on all walls of the test ducts are shown in the form of 2-D maps. In the straight section before the turn, the influence of the flow-inlet condition on the local mass transfer characteristics appears very clearly. After the turn section, the local mass transfer is also influenced by the flow-inlet condition in a duct with a large turn clearance. As the turn clearance is decreased, however, the influence of the flow-inlet condition becomes weaker.
一般社団法人日本機械学会の論文
1999-07-25