円管群を過ぎる流れの遷移と熱伝達(安定性(1),一般講演)

概要

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Heat transfer in the flow through a bundle of tubes and its transition are investigated numerically, in which the heated tubes are arranged in lines parallel as well as perpendicular to the flow, making two-dimensional lattice arrangement. The Nusselt number for the heat transfer from the tubes to the fluid and the pressure loss in the flow are evaluated from the numerical data, and confirmed to obey the empirical equations which have been utilized before at large Reynolds numbers. However, it is found that for smaller Reynolds number both the physical quantities show a discontinuous change while the Reynolds number changes continuously. The sudden changes in the Nusselt number and the pressure loss are well explained by the existence of multiple stable solutions and are shown to lead a hysteresis in these quantities.
2008-09-04