交叉三角形波纹板流道在过渡流状态下的传热与阻力特性

TRANSITIONAL HEAT TRANSFER AND RESISTANCE PROPERTIES OF CROSS-CORRUGATED TRIANGULAR DUCTS

交叉三角形波纹板流道中流动常处于过渡态。本文研究了交叉波纹板中的周期性完全发展流动及热传递。利用周期性降低几何流道的复杂性以及简化模拟对象。为了模拟这个拓扑结构中的过渡流,利用了已经验证的低雷诺数k-ε,湍流模型来说明流动中的湍流流动。得到了三维复杂计算区的温度、速度以及湍流场。计算了在恒壁温和恒热流密度两种边界条件下的摩擦系数和平均Nusselt数及其与雷诺数的关系。湍流中心从上层壁面的波纹处移向下层壁面的波纹处并逐步增强。

Periodic fully developed fluid flow and heat transfer in a cross-corrugated triangular duct is numerically studied. To model the transitional flow in the topology, a validated low Reynolds number k-omega （LKW） turbulence model is employed to account for the turbulence in the flow. The temperature, velocity, and turbulence contours are obtained in the three-dimensional complex domain. The friction factors and the segment mean Nusselt numbers are calculated and correlated with Reynolds numbers, for both uniform temperature and uniform heat flux boundary conditions. The turbulence center intensifies and moves from the upper wall corrugation to the lower wall corrugation with increasing Reynolds numbers.