Experimental determination of shell side heat transfer coefficient and pressure drop for an oil cooler shell-and-tube heat exchanger with three different tube bundles |
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| Affiliation: | 1. Faculty of Mechanical Engineering Amirkabir University of Technology, 424 Hafez Avenue, P.O. Box 15875-4413, Tehran, Iran;2. Mechanical Systems Department, Niroo research Institute (NRI), End of Pounak Bakhtari Blvd., P.O. Box 14665-517, Shahrak Gharb, Tehran, Iran;1. Institute of Combustion and Thermal Systems, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, People''s Republic of China;2. School of Mechanical and Power Engineering, Haibin College of Beijing Jiaotong University, Huanghua 061199, Hebei, People''s Republic of China;1. Department of Mechanical Engineering, College of Engineering, Tikrit University, Tikrit, Iraq;2. Faculty of Mechanical Engineering, Universiti Malaysia Pahang, 26600 Pekan, Pahang, Malaysia;3. Automotive Engineering Centre, Universiti Malaysia Pahang, 26600 Pekan, Pahang, Malaysia;1. Dokuz Eylul University, The Graduate School of Natural and Applied Sciences, Izmir, Turkey;2. Dokuz Eylul University, Faculty of Engineering, Department of Mechanical Engineering, Izmir, Turkey;1. School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2. School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China |
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| Abstract: | In this paper, the heat transfer coefficient and pressure drop on the shell side of a shell-and-tube heat exchanger have been experimentally obtained for three different types of copper tubes (smooth, corrugated and with micro-fins). Also, experimental data has been compared with theoretical data available. Correlations have been suggested for both pressure drop and Nusselt number for the three tube types. A shell-and-tube heat exchanger of an oil cooler used in a power transformer has been modeled and built for this experimental work in order to investigate the effect of surface configuration on the shell side heat transfer as well as the pressure drop of the three types of tube bundles. The bundles with the same geometry, configuration, number of baffles and length, but with different external tube surfaces inside the same shell were used for the experiment. Corrugated and micro-fin tubes have shown degradation of performance at a Reynolds number below a certain value (Re < 400). At a higher Reynolds number the performance of the heat exchanger greatly improved for micro-finned tubes. |
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