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首页> 外文期刊>Journal of Heat Transfer >Study of Laminar Forced Convection of Radiating Gas Over an Inclined Backward Facing Step Under Bleeding Condition Using the Blocked-Off Method
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Study of Laminar Forced Convection of Radiating Gas Over an Inclined Backward Facing Step Under Bleeding Condition Using the Blocked-Off Method

机译：用阻塞法研究在放气条件下倾斜向后倾斜台阶上的辐射气体层流强迫对流

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摘要

This paper presents a numerical investigation for laminar forced convection flow of a radiating gas over an inclined backward facing step in a horizontal duct subjected to bleeding condition. The fluid is treated as a gray, absorbing, emitting, and scattering medium. The two-dimensional Cartesian coordinate system is used to simulate flow over inclined surface by considering the blocked-off region in regular grid. The governing differential equations consisting the momentum and energy are solved numerically by the computational fluid dynamics techniques to obtain the velocity and temperature fields. Discretized forms of these equations are obtained by the finite volume method and solved using the SIMPLE algorithm. Since the gas is considered as a radiating medium, convection, conduction, and radiation heat transfer mechanisms take place simultaneously in the gas flow. For computation of the radiative term in the gas energy equation, the radiative transfer equation is solved numerically by the discrete ordinate method to find the radiative heat flux distribution inside the radiating medium. The effects of bleeding coefficient, inclination angle, optical thickness, albedo coefficient, and the radiation-conduction parameter on the flow and temperature distributions are carried out.
机译：本文提出了在水平管道中经过放气条件下，辐射气体在倾斜的向后台阶上的层流强迫对流流动的数值研究。流体被视为灰色，吸收，发射和散射的介质。考虑到规则网格中的阻塞区域，使用二维笛卡尔坐标系来模拟倾斜表面上的流动。利用计算流体力学技术对由动量和能量组成的控制微分方程进行数值求解，得到速度场和温度场。这些方程的离散形式通过有限体积法获得，并使用SIMPLE算法求解。由于气体被视为辐射介质，因此对流，传导和辐射传热机制在气流中同时发生。为了计算气体能量方程中的辐射项，通过离散坐标法对辐射传递方程进行数值求解，以求出辐射介质内部的辐射热通量分布。进行了渗流系数，倾角，光学厚度，反照率系数和辐射传导参数对流量和温度分布的影响。

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