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Establishment of the falling film evaporation model and correlation of the overall heat transfer coefficient

机译：降膜蒸发模型的建立及总传热系数的相关性

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In order to study the heat transfer of the falling film evaporator with phase change on both sides, in this paper we built the mathematical model and the physical model where the liquid film inside the tube is laminar and turbulent. The film thickness of the condensate at different axial positions, total condensate volume and velocity distribution, and temperature distribution of condensate outside the tube can be obtained by calculating the proposed model. Meanwhile, the liquid film thickness, velocity distribution and temperature distribution inside the tube were obtained by numerical simulation by considering the influence of the liquid film with different compositions on the heat transfer during fluid flow. With ethanol–water as the system, the overall heat transfer coefficient and heat transfer quantity of the falling film evaporator were obtained by the calculation of the model. The accuracy of the proposed model was confirmed by experiments. The model and the calculation of heat transfer proposed in this paper have enormous significance for the basic data and theoretical guidance of the heat transfer performance prediction and operational optimization of the evaporator.
机译：为了研究两侧相变的降膜蒸发器的传热，本文建立了管内液膜为层流湍流的数学模型和物理模型。通过计算模型，可以得到不同轴向位置的凝结水的膜厚，总凝结水的体积和速度分布以及管外凝结水的温度分布。同时，通过考虑具有不同组成的液膜对流体流动过程中的热传递的影响，通过数值模拟获得了管内液膜的厚度，速度分布和温度分布。以乙醇-水为系统，通过模型计算获得了降膜式蒸发器的总传热系数和传热量。实验证明了所提模型的准确性。本文提出的传热模型和计算对蒸发器传热性能预测和运行优化的基础数据和理论指导具有重要意义。

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