| 水平管外壁液膜流动状态及其对传热的影响 |
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| 引用本文： | 许莉,王世昌,王宇新,凌毅.水平管外壁液膜流动状态及其对传热的影响[J].化工学报,2002,53(6):555-559. |
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| 作者姓名： | 许莉 王世昌 王宇新 凌毅 |
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| 作者单位： | 天津大学化工学院; 天津市产品质量监督检验所 |
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| 摘 要： | 采用智能化薄膜厚度测试仪对水平管外液膜流动状态进行了研究 ,得到液膜厚度的几率分布和平均厚度 .液膜的平均厚度不仅随液体负荷的增加而加大 ,而且与管外壁不同角度有关 ;液膜的波动状态受制于液体负荷与管径的共同影响 .定义了量纲 1波高 ,并通过实验数据回归得到量纲 1波高的经验关系式 .还进行了初步的传热实验 ,得到水平管外蒸发侧传热膜系数随量纲 1膜厚和量纲 1波高的变化 ,为进一步揭示蒸发侧传热的决定因素提供实验依据
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| 关 键 词： | 流动状态 传热 海水淡化 液膜测量 水平管 降膜蒸发 蒸馏淡化 外壁蒸发 蒸馏装置 |
| 文章编号： | 0438-1157(2002)06-0555-05 |
| 修稿时间： | 2000年9月16日 |
FLOWING STATE OF LIQUID FILMS OVER HORIZONTAL TUBES AND ITS INFLUENCES ON HEAT- TRANSFER CHARACTERISTICS |
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| XU Li,WANG Shichang,WANG Yuxin,LING Yi.FLOWING STATE OF LIQUID FILMS OVER HORIZONTAL TUBES AND ITS INFLUENCES ON HEAT- TRANSFER CHARACTERISTICS[J].Journal of Chemical Industry and Engineering(China),2002,53(6):555-559. |
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| Authors: | XU Li WANG Shichang WANG Yuxin LING Yi |
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| Abstract: | The film thickness distribution outside a horizontal test tube was measured with a film-thickness meter,to obtain the average thickness.The average film thickness increased with irrigation density of water.It was also relative to θ ,and the waving intensity was controlled by both irrigation density and tube radius.Dimensionless wave amplitude was defined and correlated in terms of Reynolds number and tube diameter,by regression of experimental data.Experiments of the evaporation heat-transfer coefficient on a horizontal-tube were conducted with various irrigation density,boiling point,temperature difference, heat flux and tube diameter.The influences of dimensionless film thickness and dimensionless wave amplitude on heat- transfer coefficients were obtained.These would provide a basis for further developing high efficiency heat- transfer process and evaporator. |
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| Keywords: | desalination film thickness measurement horizontal-tube falling film evaporator |
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