沈胜强.水平管外海水降膜蒸发传热特殊现象分析[J].,2013,53(4):485-489 |
水平管外海水降膜蒸发传热特殊现象分析 |
Analysis of special heat transfer phenomenon outside horizontal-tube falling film evaporation for sea water |
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DOI:10.7511/dllgxb201304004 |
中文关键词: 水平管降膜蒸发 传热系数 海水淡化 海水 |
英文关键词: horizontal-tube falling film evaporation heat transfer coefficient desalination |
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中文摘要: |
以低温多效蒸发海水淡化装置中的水平管降膜蒸发过程为研究对象,对海水水平管降膜蒸发的
传热系数在不同蒸发温度、雷诺数(Re)等条件下沿圆周角方向的分布特征进行了实验研究.
研究结果表明:海水作为实验流体时,传热系数随蒸发温度的升高而降低,随Re的增大而呈现
先升高,达到最大值后略微降低的趋势,随圆周角的增大而先减小后增大. |
英文摘要: |
The study is focused on the heat transfer process of the horizontal-tube
falling film evaporation in a low temperature and multiple effect distillation (MED)
desalination plant. The distribution characteristics of heat transfer coefficient of
horizontal-tube falling film evaporation for sea water along the tube circumference
direction are investigated at different evaporation temperatures and different
Reynolds numbers (Re). Analytical results indicate that the growth of
evaporation temperature is disadvantageous to the average heat transfer coefficient
of sea water falling film evaporation. The heat transfer coefficient increases with
the growth of Reynolds number until it reaches the maximum value, and then a little
decrease will appear in it. The local heat transfer coefficient decreases along the
tube circumference angle, but at the bottom of the tube, it shows an increasing
trend. |
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