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对固定床中流体与换热管呈错流流动的传热进行了实验研究,并以二维传热模型进行模拟.比较模拟结果与实验测得数据得到如下结论:错流传热影响区域主要在换热管的后方,在前方几乎没有影响;错流传热过程与流体流动方向密切相关,热量传递顺流体流动方向进行,逆流动方向几乎不发生热量传递;随着Reynolds数增大,等温线范围变窄,被加热区宽度变小.拟合关联得到了壁给热系数hw和床层有效导热系数lb的关系式:hwDP/lf=14.77+0.058RePr,l/l=15.14+0.296RePr.
The heat transfer of the fluid in the fixed bed and the heat transfer tube flowed in a cross flow was experimentally studied and simulated by a two-dimensional heat transfer model. Comparing the simulation results with the experimental data, the following conclusions were drawn: The rear of the heat transfer tube has almost no effect on the front. The cross-flow heat transfer process is closely related to the flow direction of the fluid. The heat transfer follows the flow direction of the fluid and almost no heat transfer takes place in the direction of the flow. As the Reynolds number increases, The width of the zone to be heated becomes smaller, and the width of the zone to be heated becomes smaller. The relationship between the wall heat transfer coefficient hw and the effective heat transfer coefficient lb of the bed is obtained by the fitting correlation. HwDP / lf = 14.77 + 0.058RePr, l / l = 15.14 + 0.296RePr.