| Effect of Surface Treatment on Flow Boiling Heat Transfer Coefficient in CaSO4 Containing Water |
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| 作者姓名： | RENXiaoguang |
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| 作者单位： | [1]Department of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China [2]College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China [3]Department of Chemical Engineering, University of Surrey, Guildford, Surrey GU25XH, England |
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| 基金项目： | Supported by the Special Fund for Excellent Talents from Beijing Communist Party 0rganization Division, fund for Excellent Talents Reinforce Education Plan for Universities under Beijing City Administration （Z03-16）. |
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| 摘 要： | This paper reports the influence of heat transfer surface treatment on the formation of calcium sulphate deposit during flow boiling heat transfer. The surface of several test heaters was treated by surface modification techniques, such as dynamic mixing magnetron sputtering DLC （diamond-like carbon）, DLC-F （diamond-like carbon-fluorine） and AC （amorphous carbon）] and polishing to reduce surface energy. The results showed that heat transfer surface with low surface energy experienced significant reduction of formation of CaSO4 deposit. （1） Magnetron sputtering stainless steel heat transfer surface with DLC, DLC-F and plasma arc sputtering with AC did not change the surface roughness, but they reduced surface energy and improved heat transfer coefficient, so hindered CaSO4 deposit formation significantly. The DLC-F surface performed better than the DLC surface. （2） Surface energy played an important pole in improving heat transfer coefficient. The less the surface energy the more significant the heat transfer coefficient improved with other experimental conditions identical. （3） The polished surface improved the roughness of the heater, but owing to the high surface energy it was not better than the DLC-F surface for a long-term consideration on improving the heat transfer coefficient.
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| 关 键 词： | CaS04溶液 表面处理 流动沸腾 传热系数 表面能 |
| 收稿时间： | 2005-03-28 |
| 修稿时间： | 2005-03-282005-11-29 |
Effect of Surface Treatment on Flow Boiling Heat Transfer Coefficient in CaSO4 Containing Water |
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| Xiaoguang REN, Tiefeng LI,Qi ZHAO.Effect of Surface Treatment on Flow Boiling Heat Transfer Coefficient in CaSO4 Containing Water[J].Chinese Journal of Chemical Engineering,2006,14(1):122-126. |
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| Authors: | Xiaoguang REN Tiefeng LI Qi ZHAO |
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| Affiliation: | aDepartment of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China;bCollege of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;cDepartment of Chemical Engineering, University of Surrey, Guildford, Surrey GU2 5XH, England |
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| Abstract: | This paper reports the influence of heat transfer surface treatment on the formation of calcium sulphate deposit during flow boiling heat transfer. The surface of several test heaters was treated by surface modification techniques,such as dynamic mixing magnetron sputtering DLC (diamond-like carbon), DLC-F (diamond-like carbon-fluorine) and AC (amorphous carbon)] and polishing to reduce surface energy. The results showed that heat transfer surface with low surface energy experienced significant reduction of formation of CaSO4 deposit. (1) Magnetron sputtering stainless steel heat transfer surface with DLC, DLC-F and plasma arc sputtering with AC did not change the surface roughness, but they reduced surface energy and improved heat transfer coefficient, so hindered CaSO4 deposit formation significantly. The DLC-F surface performed better than the DLC surface. (2) Surface energy played an important pole in improving heat transfer coefficient. The less the surface energy the more significant the heat transfer coefficient improved with other experimental conditions identical. (3) The polished surface improved the roughness of the heater, but owing to the high surface energy it was not better than the DLC-F surface for a long-term consideration on improving the heat transfer coefficient. |
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| Keywords: | deposit surface modification surface energy flow boiling |
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