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首页> 外文期刊>International Journal of Heat and Mass Transfer >THE EFFECTS OF DUCT INCLINATION ANGLE ON LAMINAR MIXED CONVECTIVE FLOWS OVER A BACKWARD-FACING STEP
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THE EFFECTS OF DUCT INCLINATION ANGLE ON LAMINAR MIXED CONVECTIVE FLOWS OVER A BACKWARD-FACING STEP

机译：管道倾角对向后跨步层流混合对流的影响

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Three-dimensional numerical simulations were carried out for mixed convective flows over a backward-facing step in a rectangular duct. Reynolds number, expansion ratio and aspect ratio were kept constant at Re=125, ER=2 and AR=16, respectively. Heat flux at the wall downstream of the step was dept uniform, while other walls were kept at adiabatic condition. Effect of the inclination angles, 0_1,0_2,was the main objective in this study. It was found that when 0_1 was varied, the effect of buoyancy became prominent at 0_1=0 deg, 180 deg, while the effect was relatively small for the two horizontal cases (0=90 deg,270 deg).However, there was still small difference between 0_1=90 deg and 270d eg in the region immediately after the step where the flow was relatively slow. When θ_2 was varied, flow and thermal fields became asymmetric about the duct centerline, except when 0_2=0 deg,180 deg. The maximum Nusselt number, which appears symmetrically near the side walls in pure forced convection cases, was obtained at only one location close to the lower side wall.
机译：对矩形管道中向后台阶上的混合对流进行了三维数值模拟。雷诺数，膨胀比和纵横比分别保持恒定，分别为Re = 125，ER = 2和AR = 16。在该步骤下游的壁处的热通量是均匀的，而其他壁则保持在绝热条件下。倾斜角0_1,0_2的影响是本研究的主要目标。结果发现，当0_1变化时，浮力作用在0_1 = 0度，180度时显着，而在两个水平情况下（0 = 90度，270度）则浮力作用相对较小。在0_1 = 90度和270d之间有一个很小的差异，例如在紧随流动较慢的步骤之后的区域中。当θ_2变化时，除了0_2 = 0度，180度以外，流场和热场都围绕管道中心线不对称。在仅强制对流情况下，在侧壁附近对称出现的最大Nusselt数仅在靠近下侧壁的一个位置获得。

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