| 张梦超,牟兴森,沈胜强.水平管外降膜蒸发气水对流过程换热量数值模拟分析[J].,2022,62(2):172-178 |
| 水平管外降膜蒸发气水对流过程换热量数值模拟分析 |
| Numerical simulation analysis of heat transfer in falling film evaporation process of air-water convection outside horizontal tube |
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| DOI：10.7511/dllgxb202202009 |
| 中文关键词: 蒸发式冷凝器 降膜蒸发 传热传质 |
| 英文关键词: evaporative condenser falling film evaporation heat and mass transfer |
| 基金项目:国家自然科学基金资助项目(重点项目51936002)；辽宁省科技重大专项(2019JH1/10300003)；大连市科技创新基金重大课题(2019J11CY020). |
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| 中文摘要: |
| 对水平管外降膜蒸发气水对流过程进行了三维数值模拟．模拟了迎面风速分别为1.0、1.6、2.2 m/s以及喷淋密度从0.036 kg/(m·s)增加至0.084 kg/(m·s)工况下气水对流传热传质过程，计算了气水对流过程的平均换热系数与Sh．结果表明，研究工况范围内汽化换热量在总换热量中占比为71%~77%；同一迎面风速空气条件下，随着喷淋雷诺数的增加，Sh先增大后缓慢减小；迎面风速的增大可以显著提高传热传质效果． |
| 英文摘要: |
| A three-dimensional numerical simulation was carried out for the falling film evaporation process of air-water convection outside horizontal tube. In the simulation, air face velocity was 1.0, 1.6, 2.2 m/s and the spray density increased from 0.036 kg/(m·s) to 0.084 kg/(m·s). Under the working conditions, the average heat transfer coefficient and Sh were calculated. The results show that the vaporization heat transfer accounts for 71%-77% of the total heat transfer under the working conditions of the study. Under the same air face velocity condition, as the spray Reynolds number increases, the Sh first increases and then slowly decreases. The increase of the air face velocity can significantly improve the heat and mass transfer effect. |
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