| Marangoni effect of cracked liquid film of an aqueous electrolyte flowing over a vertical heated plate |
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| 作者姓名： | ZHAO XianGuang ZHANG Feng PENG Jing GENG Jiao ZHANG ZhiBing |
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| 作者单位： | [1]School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China [2]Department of Pharmaceutical Engineering, China Pharmaceutical University, Nanjing 210009, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China （Grant No. 20576050） |
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| 摘 要： | An experimental investigation was performed on Marangoni effect of cracked liquid film of aqueous Na_2SO_4 flowing over a vertical heated plate by using a sensitive infrared imaging technique. The results show that the thermal and solutal Marangoni effects, which result from the non-uniform distributions of surface temperature and concentration of the film, respectively, occur in the streamwise and transverse directions of the film, generating different influences on the film heat transfer. Taking account of the Marangoni number (Ma) and the solution concentration (c_0), a correlation of the Nusselt number (Nu) for the cracked liquid film is proposed.
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| 关 键 词： | 水电解质 硅化钠 红外线成像技术 热转移 |
| 收稿时间： | 22 December 2006 |
| 修稿时间： | 2006-12-22 |
Marangoni effect of cracked liquid film of an aqueous electrolyte flowing over a vertical heated plate |
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| ZHAO XianGuang ZHANG Feng PENG Jing GENG Jiao ZHANG ZhiBing.Marangoni effect of cracked liquid film of an aqueous electrolyte flowing over a vertical heated plate[J].Chinese Science Bulletin,2007,52(21):2887-2891. |
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| Authors: | Zhao XianGuang Zhang Feng Peng Jing Geng Jiao Zhang ZhiBing |
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| Institution: | (1) School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China;(2) Department of Pharmaceutical Engineering, China Pharmaceutical University, Nanjing, 210009, China |
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| Abstract: | An experimental investigation was performed on Marangoni effect of cracked liquid film of aqueous Na_2SO_4 flowing over a vertical heated plate by using a sensitive infrared imaging technique. The results show that the thermal and solutal Marangoni effects, which result from the non-uniform distributions of surface temperature and concentration of the film, respectively, occur in the streamwise and transverse directions of the film, generating different influences on the film heat transfer. Taking account of the Marangoni number (Ma) and the solution concentration (c_0), a correlation of the Nusselt number (Nu) for the cracked liquid film is proposed. |
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| Keywords: | aqueous electrolyte Na2SO4 Marangoni effect cracked falling film infrared imaging technique heat transfer |
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