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Numerical evaluation and the effects of geometrical and operational parameters on thermal performance of the shell and double coil tube heat exchanger
Author(s) -
Noorbakhsh Mehdi,
Pourfallah Mohsen,
Ajarostaghi Seyed S. M.,
Zaboli Mohammad
Publication year - 2020
Publication title -
heat transfer
Language(s) - English
Resource type - Journals
eISSN - 2688-4542
pISSN - 2688-4534
DOI - 10.1002/htj.21847
Subject(s) - mechanics , nusselt number , heat transfer coefficient , electromagnetic coil , materials science , heat transfer , heat exchanger , concentric tube heat exchanger , shell and tube heat exchanger , plate heat exchanger , pressure drop , shell (structure) , convective heat transfer , thermodynamics , composite material , engineering , physics , electrical engineering , reynolds number , turbulence
Heat exchangers are extensively used in various industries. In this study, the impact of geometric and flow parameters on the performance of a shell and double helical coil heat exchanger is studied numerically. The investigated geometric parameters include external coil pitch, internal coil pitch, internal coil diameter, and coil diameter. The influences of considered geometrical parameters are analyzed on the output temperature of the hot and cold fluid, convective heat transfer coefficient, pressure drop, and average Nusselt number. Water is considered as working fluid in both shell and tube. As an innovation, double helical coils are used instead of one in the heat exchanger. To compare the obtained results accurately, in each section, the heat transfer area (coil outer surface) is kept constant in all models. The results show that the geometrical parameters of double helical coils significantly affect the heat transfer rate.