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《化学科学与工程前沿(英文)》 >> 2018年 第12卷 第3期 doi: 10.1007/s11705-018-1703-1

Tubes with coated and sintered porous surface for highly efficient heat exchangers

1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
2. Wuxi Chemical Equipment Co., Ltd, Wuxi 214131, China
3. Department of Material Science and Engineering, University of California in Irvin, CA 92697, USA

录用日期: 2018-04-19 发布日期: 2018-09-18

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摘要

Surface modification is a direct and effective way to enhance the efficiency of heat exchangers. Surface modification by forming a microporous coated layer can greatly enhance the boiling heat transfer and thus achieve a high performance. In this paper, we systematically investigate the boiling behavior on a plain surface with/without sintered microporous coatings of copper powder. The results demonstrated that the sintered surface has a better performance in nucleate boiling due to the increased nucleation sites. The superheat degree is lower and the bubble departure diameter is larger for the sintered surface than for the plain surface, so the heat can be carried away more efficiently on the sintered surface. In addition, the heat transfer capacity on the sintered surface depends on both the powder size and the coating thickness for a high flux tube. The optimum heat transfer capacity can be obtained when the thickness of the microporous coating layer is 3–5 times of the sintered powder diameter. As a result, the heat transfer coefficient tube can be up to 3 times higher for the tube with a sintered surface than that with a plain surface, showing a pronounced enhancement in heat transfer and a high potential in chemical engineering industry application.

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