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《Sugarcane and Canesugar》 2003-06
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Research on the Twisted Strip with Teeth to Enhance Self-cleaning Ability of Condensing Tubes

Liu Guiying1 Peng Deqi2, Yu Xiumin2, Zhi Xiaoheng2, Jiang Shaoqing1, Yu Tianlan2 (1 Changsha Institute of Technology, Hunan 410015; 2 Mechanical Clean Institute, Zhuzhou Institute of Technology, Hunan 412008)  
The present smooth twisted strip without teeth cannot be used to self-clean away fouling for heat exchangers at low flowing velocity. For this reason, the authors develop a new kind of twisted strip with oblique teeth, which can enhance the force moment of self-cleaning. The principle is that there are dissymmetrical oblique teeth distributed evenly on both surfaces of strip and the heat transfer flowing fluid led by the strip has a dissymmetrical reacting force on the strip, thus the force moment of self-rotation is formed. The overall operation moment is increased by 277% and the overall heat transfer coefficient is increased by 30% over the smooth twisted strip. For a heat exchanger of 6m heat transfer tubes and 4 tube circuits, the flowing resistance is about 0.15 MPa at the flowing velocity of 0.5m/s. Therefore this new technique has a good application prospect.
【Fund】: 湖南省自然科学基金资助项目
【CateGory Index】: TS243
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