Volume 20, Issue 2 (February 2020)
Modares Mechanical Engineering 2020, 20(2): 341-352 |
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Yousefi A, Hossein Nezhad A. Numerical Investigation of the Effects of Fin Pitch, Transverse, and Longitudinal Pitchs and their Numbers in a Plate-Fin Flat-Tube Heat Exchanger. Modares Mechanical Engineering 2020; 20 (2) :341-352
URL: http://mme.modares.ac.ir/article-15-27683-en.html
URL: http://mme.modares.ac.ir/article-15-27683-en.html
1- Mechanical Engineering Department, Engineering Faculty, University of Sistan and Baluchestan, Zahedan, Iran
2- Mechanical Engineering Department, Engineering Faculty, University of Sistan and Baluchestan, Zahedan, Iran , nezhadd@hamoon.usb.ac.ir
2- Mechanical Engineering Department, Engineering Faculty, University of Sistan and Baluchestan, Zahedan, Iran , nezhadd@hamoon.usb.ac.ir
Abstract: (2449 Views)
In the present work, the effects of fin pitch, transverse pitch, longitudinal pitch and the number of the longitudinal pitch in a plate-fin flat tube heat exchanger were studied. The fluid flow was assumed laminar, steady, and incompressible. Continuity, momentum, and energy equations for fluid flow and conduction equation for fin were solved, using the finite volume method. Dimensionless results showed that increasing the fin pitch causes to increase of the j-Coulburn coefficient by 132.68% and reduces the friction coefficient rate by 13.35%. Also, increasing transverse tube pitch causes to increase of j coefficient by 203.83% and reduces 24.22% of the f coefficient. By increasing longitudinal tube pitch, j and f coefficients are reduced 84% and 32%, respectively. Dimensional results showed that by increasing fin pitch, heat transfer is reduced 2.2% and thermal performance is increased by 75%. Increasing transverse tube pitch causes to increase heat transfer and thermal performance about 341% and 255%, respectively. Increasing longitudinal tube pitches result in decreasing the heat transfer and thermal performance about 71% and 79%, respectively. Increasing the number of longitudinal tube pitches, N, causes to increase of the heat transfer rate, but for N>28, no sensible increase in heat transfer rate is observed therefore, N>28 is not recommended. Maximum thermal performance is achieved at N=5 and for N>5 thermal performance is decreased.
Article Type: Original Research |
Subject:
Heat & Mass Transfer
Received: 2018/12/2 | Accepted: 2019/05/19 | Published: 2020/02/1
Received: 2018/12/2 | Accepted: 2019/05/19 | Published: 2020/02/1
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