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首页> 美国政府科技报告 >THE ANALYTICAL DETERMINATION OF THE LOCAL HEAT TRANSFER CHARACTERISTICS OF GASES FLOWING TURBULENTLY IN THE THERMAL ENTRANCE REGION OF A CIRCULAR DUCT WITH LARGE TEMPERATURE DIFFERENCES BETWEEN THE GAS AND THE DUCT WALL
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THE ANALYTICAL DETERMINATION OF THE LOCAL HEAT TRANSFER CHARACTERISTICS OF GASES FLOWING TURBULENTLY IN THE THERMAL ENTRANCE REGION OF A CIRCULAR DUCT WITH LARGE TEMPERATURE DIFFERENCES BETWEEN THE GAS AND THE DUCT WALL

机译：气体与管壁温差大的圆形管道热流区湍流气体局部传热特性的分析测定

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The mathematical description of flow with heat transfer is pre-sented for a fluid flowing through a circular duct of constant area, under laminar and turbulent flow conditions. A review of the published literature is included that summarizes the analytical work pertinent to the calculation of heat transfer in the entrance region. A calculation of the heat transfer characteristics for air and carbon dioxide in the entrance region has been made employing the boundary layer equations of Eckert (2)* that were non-dimensionalzed accord¬ing to the method of Deissler (19). The calculations were performed for the boundary conditions of constant heat flux (heating the gas), and constant wall temperature (cooling the gas);it was assumed that the velocity profile was fully developed and the temperature profile was uniform at the cross section where energy exchange was initiated

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