The Effect of Air Injection in a Shell and Tube Heat Exchanger
Shaheed Mahdi Talib†, Farhan Lafta Rashid‡, and Muhammad Asmail Eleiwi‡†*
†General Directorate of Education in Kerbala / Ministry of Education-Iraq
‡College of Engineering / University of Kerbala-Iraq
‡†Department of Mechanical Engineering, College of Engineering, Tikrit University, Tikrit-Iraq
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In this study, the performance of heat transfer and analysis of exergy with different points of air injection in a shell and tube heat exchanger has been carried out. Various cases were taken into consideration with and without air injection through the shell, tube, and both shell and tube and the results are compared. In this study, it was given a higher amount of Nusselt number (Nu) for the (HE) with air bubble injection than the amount of (Nu) for the (HE) without air bubble injection about 2.41% – 25.5 %. Maximum (NTU) was occurred for air bubble injection through both shell and tube at high amount of Reynolds number (Re) about 15000. The enhancement in the heat transfer rate for air injection through shell, tube, both shell and tube are 4.45%, 8.42%, 13.63%, respectively with respect to the case of no air bubble injection. The enhancement in the effectiveness of air injection through the shell, tube, both shell and tube are 32.4%, 45.6%, 54.8%, respectively regarding the case of no air bubble injection