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首页> 外文会议>ASME/JSME Thermal Engineering Joint Conference >EFFECT OF FLUID TEMPERATURES ON THREE-DIMENSIONAL MIXED CONVECTION IN A HORIZONTAL SQUARE CHANNEL WITH HEATED AND COOLED SIDE WALLS
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EFFECT OF FLUID TEMPERATURES ON THREE-DIMENSIONAL MIXED CONVECTION IN A HORIZONTAL SQUARE CHANNEL WITH HEATED AND COOLED SIDE WALLS

机译：流体温度对水平侧壁水平方沟道三维混合对流的影响

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摘要

In the present analysis, the characteristics of heat transfer and flow on three-dimensional mixed convection in a horizontal square channel with heat transfer side walls (Tw = 20°C and 40°C, Fig. A-1) were examined numerically for five kinds of fluid temperatures. The working fluid was water and the flow was assumed to be laminar and incompressible. The SIMPLE procedure and QUICK scheme were used to solve the governing equations through a control volume. The kinetic viscosity and thermal conductivity depending on temperature were considered in governing equations. Various fluid temperatures affected the generation of swirl flow, the number and the intensity of vortices at cross section. Flow reversal was generated at the entrance section. The intensity of secondary flow and pressure drop between entrance and exit depended on Gr/Re{sup}2. Heat flow reversal from and to the side wall existed simultaneously on the same wall in the case of higher or lower fluid temperature than both side walls temperatures (Fig. A-2).
机译：在本分析中，数值检查了与传热侧壁（Tw = 20℃和40℃的水平方径中的三维混合对流的传热和流量的特性。各种液体温度。工作流体是水，并且假设流动是层状和不可压缩的。简单的过程和快速方案用于通过控制量来解决控制方程。根据控制方程考虑了根据温度的动力学粘度和导热率。各种流体温度影响横截面的旋流，数量和涡流的数量和强度。流动反转在入口部分产生。入口和出口之间的二次流量和压降的强度依赖于GR / RE {SUP} 2。在比侧壁温度更高或更低的流体温度的情况下，在相同的壁上同时存在热流和到侧壁的热流反转在相同的壁上存在（图A-2）。

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