矩形管内脈動流の熱・物質輸送特性 : 第1報脈動周波数が管内に設置された平板面の熱伝達に及ぼす影響

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This study deals with flow behavior and associated heat transfer in pulsating duct flow. As well as mechanical engineers, researchers in bioengineering field also focus on heat and mass transport characteristics of pulsating flow from the viewpoint of life science. In spite of more than thirty-year history of pulsating flow and heat transfer studies, flow structure with periodical flow rate change and its effect on heat transfer are still at question. Researchers showed conflicting results. Some of them showed heat transfer enhancement due to flow pulsation, the others reported heat transfer prevention or no impact of flow pulsation on heat transfer. In order to make clear the complicated unsteady flow structure with periodical velocity fluctuation and its effect on heat transfer, it must be necessary to have macroscopic observation and image processing analysis of both the flow and temperature fields. The objective of this study, therefore, is to make clear the pulsating flow structure and heat transfer characteristics based on the visualizations of flow and temperature fields. Particle Image Velocimetry (PIV) and color schlieren visualization was applied to flow and temperature fields, respectively. Results showed that flow pulsation induced complicated spatial velocity distributions. Series vortices were formed in flow direction and they moved in span-wise direction from the sidewalls to the center of the duct. Such flow behavior caused locally high and low speed regions. From these results, it is concluded that heat transfer enhancement or prevention depends on increase or decrease of local flow rate induced by flow pulsation.
社団法人日本伝熱学会の論文
2007-10-01

矩形管内脈動流の熱・物質輸送特性 : 第1報脈動周波数が管内に設置された平板面の熱伝達に及ぼす影響

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矩形管内脈動流の熱・物質輸送特性 : 第1報 脈動周波数が管内に設置された平板面の熱伝達に及ぼす影響

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矩形管内脈動流の熱・物質輸送特性 : 第1報脈動周波数が管内に設置された平板面の熱伝達に及ぼす影響