| Two-phase flow patterns for flow condensation in small-diameter tubes |
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| 作者姓名： | WANG Buxuan DU Xiaoze |
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| 作者单位： | Thermal Engineering Department. Tsinghua University. Beijing 100084. China,Thermal Engineering Department. Tsinghua University. Beijing 100084. China |
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| 摘 要： | Two-phase flow patterns have been observed visually to investigate the effects of tube diameter, mass flux and tube inclination on flow condensation in small-diameter tubes. For horizontal or inclined small-diameter tubes, gravity-domination is decreased by shear stress and surface tension on phase change interface, which weakens the stratification of condensate and vapor flow due to the action of gravity perpendicular to flow direction. As decreasing the tube diameter from 5. 79 mm to 2.18 mm. the annular or sub-annular flows become prevailing in flow regime map. The existing flow regime maps for macro scale cannot predict the experimental data in the present study.
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| 关 键 词： | small-diameter tube flow condensation two-phase flow pattern. |
Two-phase flow patterns for flow condensation in small-diameter tubes |
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| WANG Buxuan,DU Xiaoze.Two-phase flow patterns for flow condensation in small-diameter tubes[J].Progress in Natural Science,2002,12(1):55-59. |
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| Authors: | WANG Buxuan DU Xiaoze |
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| Institution: | Thermal Engineering Department, Tsinghua University, Beijing 100084, China |
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| Abstract: | Two-phase flow patterns have been observed visually to investigate the effects of tube diameter, mass flux and tube inclination on flow condensation in small-diameter tubes. For horizontal or inclined small-diameter tubes, gravity-domination is decreased by shear stress and surface tension on phase change interface, which weakens the stratification of condensate and vapor flow due to the action of gravity perpendicular to flow direction. As decreasing the tube diameter from 5. 79 mm to 2.18 mm. the annular or sub-annular flows become prevailing in flow regime map. The existing flow regime maps for macro scale cannot predict the experimental data in the present study. |
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| Keywords: | small-diameter tube flow condensation two-phase flow pattern |
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