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在纵槽表面膜状冷凝传热中,其传热量几乎仅由波峰区域形成。作者以该域为传热面,进行了传热分析与计算。计算结果表明,管长对平均传热膜系数影响很小。这一结果与Ozgen对有关实验现象的解释基本一致,可在一定程度上证实他的看法。对波谷区冷凝液流动做了数值解。对该区液膜厚度与管长做了数值关联,进而得到了三角形纵槽管最大有效管长及波峰区域面积计算公式。 本文方法与结果,为三角形槽管的管长设计提供了一种简便可行的方法。同时,该类纵槽管的传热计算也因之易于进行。
In the longitudinal groove membrane surface film condensation heat transfer, the heat transfer is almost only formed by the peak area. The author uses the domain as the heat transfer surface and analyzes the heat transfer. The calculation results show that the tube length has little effect on the average heat transfer coefficient. This result is basically consistent with Ozgen’s explanation of the experimental phenomena, to a certain extent, to confirm his view. Numerical solution of condensate flow in trough region. The relationship between the thickness of the liquid film and the tube length is numerically related, and the formula of the maximum effective tube length and the area of the peak area of the triangular slot tube is obtained. The method and result of this paper provide a simple and feasible method for designing the tube length of triangular slotted tube. At the same time, the heat transfer calculation of this type of slotted tube is also easy.