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首页> 外文期刊>Journal of Heat Transfer >Combined Buoyancy Effects of Thermal and Mass Diffusion on Laminar Mixed Convection in Vertical and Horizontal Semicircular Ducts
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Combined Buoyancy Effects of Thermal and Mass Diffusion on Laminar Mixed Convection in Vertical and Horizontal Semicircular Ducts

机译：热和质量扩散对垂直和水平半圆管层流混合对流的联合浮力效应

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摘要

The development of laminar mixed convection with heat and mass transfer in vertical and horizontal semicircular ducts has been investigated for the case of thermal boundary conditions of uniform heat input, concentration at the fluid-solid interface axially, and uniform peripheral wall temperature at any axial station. The governing equations were solved numerically over the following conditions: Pr = 0.7, Le =1, Re = 500, Gr_t = 1.66× 10~5, and Gr_c = 7.66 × 10~5. The combined effects of solutal and thermal Gra-shof numbers on the flow and thermal fields were observed in terms of the axial velocity, temperature, and concentration distributions, as well as, friction factor, Nusselt number, and Sherwood number. Further, the development of velocity, temperature, and concentration at different axial stations was found to be influenced by the solutal and thermal Gra-shof numbers. The results also showed that the forced-convection boundary layer development dominates very close to the duct inlet, while further downstream, the heat and mass transfer rates are enhanced due to the effect of solutal buoyancy.
机译：在均匀的热输入，轴向上的固-液界面处集中以及任何轴向站的周壁温度均匀的热边界条件下，研究了在垂直和水平半圆形管道中具有传热和传质的层流混合对流的发展。 。在以下条件下对控制方程进行数值求解：Pr = 0.7，Le = 1，Re = 500，Gr_t = 1.66×10〜5和Gr_c = 7.66×10〜5。从轴向速度，温度和浓度分布，以及摩擦系数，努塞尔数和舍伍德数，可以观察到固溶和热格拉索夫数对流场和热场的综合影响。此外，发现不同轴向站的速度，温度和浓度的发展受固溶和热Grashof数的影响。结果还表明，强迫对流边界层的发育在非常靠近管道入口处占主导地位，而在更下游，由于溶质浮力的作用，传热和传质速率得以提高。

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