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首页> 外文会议>HT2008;ASME summer heat transfer conference >NUMERICAL INVESTIGATION ON FORCED CONVECTION IN CIRCULAR TUBES WITH SEPTA
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NUMERICAL INVESTIGATION ON FORCED CONVECTION IN CIRCULAR TUBES WITH SEPTA

机译：带有SEPTA的圆管强制对流的数值研究

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摘要

Heat transfer in fluids is very important in many industrial heating and cooling equipments. Convective heat transfer can be enhanced passively by changing flow geometry, boundary conditions or by increasing thermal conductivity of the fluid. Another possibility to increase heat transfer with gas is to employ extended surfaces. When gas flows in a tube, septa with one or more openings can be used as fins. Furthermore, if the openings are arranged to give a spiral motion around the cylinder axis wall-fluid contact area increases. As a consequence the presence of the septa can significantly augment pressure drops. In this paper a numerical investigation is carried out on forced convection in circular isothermal tubes. The fluid is air and ideal gas model is employed. Septa are introduced and several shapes and arrangements are analyzed. The investigation is accomplished by means of the commercial code Fluent. A turbulence model is used. Results are presented in terms of temperature and velocity fields, local and average heat transfer coefficients and pressure drops. The aim of this study is to find the shape and arrangement of septa such to give high heat transfer coefficients and low pressure drops.
机译：在许多工业加热和冷却设备中，流体中的热传递非常重要。对流传热可以通过改变流的几何形状，边界条件或通过增加流体的热导率来被动地增强。增加与气体的热传递的另一种可能性是采用扩展的表面。当气体在管中流动时，可以将具有一个或多个开口的隔垫用作散热片。此外，如果将开口布置成绕圆柱轴线进行螺旋运动，则流体接触面积会增加。结果，隔垫的存在会大大增加压降。本文对圆形等温管中的强制对流进行了数值研究。流体是空气，并且采用了理想的气体模型。介绍了隔垫，并分析了几种形状和布置。该调查是通过商业代码Fluent完成的。使用了湍流模型。结果以温度和速度场，局部和平均传热系数以及压降表示。这项研究的目的是找到隔板的形状和布置，以使其具有较高的传热系数和较低的压降。

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