文章基本信息

标题：Development of Exchangeable Fins for Heat Transfer Enhancement in Existing Shell and Tube Heat Exchangers
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作者：Hiroyuki TANAKA ; Koichi NAKASO ; Naoyuki FURUMOTO 等
期刊名称：Journal of Environment and Engineering
电子版ISSN：1880-988X
出版年度：2011
卷号：6
期号：2
页码：400-411
DOI：10.1299/jee.6.400
出版社：The Japan Society of Mechanical Engineers
摘要：To conventionally extend heat transfer area in shell-and-tube heat exchangers, a method is proposed where sheet materials with high thermal conductivities are stretched among tubes. The numerical simulations are carried out to predict the performance of heat exchanger with or without the sheets. As a result, it is found that thermal contact resistances between the sheet and tubes rather than thickness and thermal conductivity of the sheet influence overall heat transfer coefficient. In the experiments, the carbon fibers clothes (27 W m^-1 K^-1) are pass zigzag though the tubes whose pitch is 20 mm. The heat transfer rate between hot water flowing in the tube side and air in the shell side are measured. No substantial improvement of heat transfer is unfortunately observed experimentally due to contact thermal resistance. The method proposed in this study conclusively has a potential that the heat transfer rate improves no less than a few ten percents.
关键词：Thermal Engineering;Heat Transfer Enhancement;Heat Exchanger