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Experimental Study of Temperature Distribution in Turbulent Flow through Tubes with Longitudinal Perforated X-Shaped Inserts

By Md. Mizanuzzaman, Nusrat Jahan, Amina Ahmed, Suraia Rahman and Md. Almostasim Mahmud

Abstract

Abstract—Considering different industrial applications an experimental investigation has been carried out for turbulent flow in a circular tube with perforated x-shaped inserts with perforations of 0.0%, 5.7%, 10.15 % and 15.87%. Air velocities, air temperatures, tube wall temperatures were collected to analyze the surface or wall temperature and the bulk temperature distribution for the plain tube as well as for the tube with inserts. Temperature distribution profile is a dominant factor for overall heat transfer performance and to alter that profile inserts with different perforations were used. The results indicated that local surface temperature decreases with the increasing Reynolds number at corresponding point on each tube surface and the average surface temperature for tubes with perforated inserts is 1.03-1.25 times lower than smooth tube and about 1.15 times lower than the tube with imperforated insert and it is much lower for insert with porosity, R p=15.87%. For tubes with perforated insert, local bulk temperature at each corresponding point is about 1.01-1.18 fold compared to smooth tube and about 1.01-1.05 fold compared to the tube with imperforated insert and local bulk temperature distribution along the length of test section is higher for insert with porosity, R p=15.87%. Keywords—X-shaped insert, porosity, Reynolds number, turbulent flow, temperature distribution

Year: 2014
OAI identifier: oai:CiteSeerX.psu:10.1.1.413.3720
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