Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 20    No. 5    May 2010

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Surface treatment of 3D outside serrated integral-fin tube
manufactured by rolling and extrusion
BAI Peng-fei(白鹏飞), LIU Xiao-kang(刘小康), YAN Hui(燕 辉), TANG Biao(唐 彪)

School of Mechanical and Automotive Engineering, South China University of Technology,
Guangzhou 510640, China

Abstract:The outside serrated integral-fin tubes fabricated by rolling−plowing−extrusion processing were surface-treated through different processes of annealing in hydrogen atmosphere, electrochemical corrosion or sandblasting. The purpose was to eliminate residual stress, clear secondary micro-fins and enhance heat transfer performance. By comparing the surface characteristics, it is found that the finned tubes treated by electrochemical corrosion have the most glabrous surfaces where the fins are almost perfectly reserved. Clear layer cracks can be observed on the top of the fins. These structures are effective in enhancing heat transfer performance when being applied to flow heat exchange. Therefore, the finned tubes treated by electrochemical corrosion are proper for the tubular exchanger with water coolant. The finned tubes treated by sandblasting have rougher surfaces with layer cracks and micro gaps removed. As these structures are useful to clearing adhesive feculence, the tubes are more suitable for the tubular heat exchanger with oil coolant.

 

Key words: finned tube; surface treating; heat transfer; multi-dimensional surface

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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