Irreversibility analysis of induced swirl flow inside the pipes of flat-plate solar collector using dual tangential nozzles

Cao Y. Ayed H. Issakhov A. Sene N. Bouallegue B.
2022 Oxford University Press

International Journal of Low-Carbon Technologies
2022 #17 222 - 232 pp.

In the present research, dual-nozzle swirl generator was installed at the blocked end of the straight tube to inject flow tangential to the wall of the pipe with various injection inclinations compared to the longitudinal axis. This causes a swirl flow inside the pipe. Altering some decisive variables, including injection angle, side of nozzle cross-section, pipe diameter, and flow rate, caused to attain various cases with unique hydraulic-geometrical characteristics. Classes A⋯-D50-N⋯-M⋯ and A⋯-D20-N⋯-M⋯ bear the main characteristics of the cases embodied in their sub-classes. Entropy generation (St), Nu∗, NE, Heat Transfer Improvement (HTI) index and ηw-s were used as effective tools for the basement of the system based on the irreversibility concept. The results showed that all of the cases of class A⋯-D50-N⋯-M⋯ cause lower frictional-contributed and higher thermal-contributed entropy generation compared to the class A⋯-D20-N⋯-M⋯. The highest values of the HTI index are 1.5 and 1.763 obtained by A30-D20-N5-M0.4 and A90-D20-N6.25-M0.1, respectively.

entropy generation , irreversibility , nozzle , swirl flow

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School of Computer Science and Engineering, Xian Technological University, Xian, 710021, China
Department of Civil Engineering, College of Engineering, King Khalid University, Abha, 61421, Saudi Arabia
Department of Mathematical and Computer Modelling, al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Département de Mathématiques de la Décision, Université Cheikh Anta Diop de Dakar, Faculté des Sciences Economiques et Gestion, Dakar Fann, BP 5683, Senegal
Department of Computer Engineering, College of Computer Science, King Khalid University, Abha, Saudi Arabia

School of Computer Science and Engineering
Department of Civil Engineering
Department of Mathematical and Computer Modelling
Département de Mathématiques de la Décision
Department of Computer Engineering

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