Numerical Study of Convection Air Currents Around a Hot Cylinder Inside a Triangular Cavity

A. A. Mohammed, Ansam Adil Mohammed, S. Channapattana
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Abstract

A numerical study was performed of natural laminar convective heat transfer to its concentrated triangular enclosure around a horizontal circular cylinder. The air-filled enclosure kept the inner and outer cylinders at uniform temperatures. The Boussinesq density approximation to the momentum problem and the control volume approach iteratively resolved the governing equations to explain buoyancy. CFD results show that the velocity behavior increases by increasing Ra, so the stream lines becomes more sluggish and less uniform behavior and vortices gets less circulated pattern. The rotation angle ? has significant effect on vortices, at 90o gives the higher range of velocity zones of free convection with higher range. The thermal boundary layer seems to be larger in rr=0.455 as compared with rr=0.345 and decreases by increasing ?. The larger variation of isotherms and thermal boundary layer appears at lower ? because the higher heat transfer rate occurs at higher ? and becomes maximum at 90o. Eight correlations of average Nusselt number have been deduced as a function of Rayleigh number for the taken values of aspect ratio and enclosure angles of rotation and inclination.
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三角形空腔内热圆柱周围对流气流的数值研究
数值研究了自然层流对流换热的集中三角圈地水平圆柱体。充气外壳保持内在与外在的圆柱体在均匀温度。动量问题的Boussinesq密度近似和控制体积方法迭代求解了解释浮力的控制方程。CFD结果表明,随着Ra的增大,速度特性增大,流线变得更加缓慢,均匀性降低,涡的循环模式减少。旋转角度?对涡旋有显著的影响,在90度处给出的自由对流速度区范围较大,范围较大。与rr=0.345相比,当rr=0.455时,热边界层增大,随着r=0.345的增大而减小。等温线和热边界层的变化较大。因为更高的传热率发生在更高的地方?并成为最大在90 o。对所取的纵横比和围合转角、倾斜角的值,推导出平均努塞尔数与瑞利数之间的8种相关关系。
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