设置三角形阻流件的通道内流动阻力特性数值研究

Numerical study on friction factor in the channel with triangle baffles

为了深入研究设置三角形阻流件的水平矩形通道内传热强化机理,采用k-ε两方程模型以及SIMPLE算法,对Re在1500～35 000范围内,流体流过该通道时的流动问题进行了数值求解.模拟计算的结果表明,当Re＞8 000时,阻力系数,随着阻流件顶角α的增大而减少;当Re≤8 000时,阻力系数,随顶角α和Re数的变化不明显;阻力系数.厂随着阻流件的高度h的增大而增加;在一定的高度范围内,与不设阻流件的光滑通道相比,设置阻流件通道的Webb性能因子田得到了改善.

In order to study the heat transfer enhancement mechanism of the fluid flow through the rectangular channel with triangle baffles deeply, numerical solution has been made by S1MPLE algorithm using the k-ε two equations model of turbulent flow for Re in the range of 1 500 ～ 35 000. The simulation results show that when Re 〉 8 000, the friction factor f decreases with the increasing of the top angle α; when Re ≤ 8 000, the friction factorfvaries with the top angle α inapparently. And the factor f increases with the increasing of the height of the baffle. Compared with the no-baffle channel, the Webb performance evaluation factor is improved under certain ranges of the baffle height for the baffles channel.