CFD analysis for the performance improvement of a double pipe heat exchanger with twisted tape having triangular cut

ABSTRACT

This paper studied the thermal performance of a double pipe heat exchanger using triangular cut twisted tape. The triangular cut twisted tape used in the study has w/W of 0.31, 0.47, and 0.63, respectively. The range of Reynolds number undertaken for studies was in turbulent zone varying from 5500 to 15300. k–ε turbulence model has been used for computational studies. It has been found that the effect of twisted tape results in swirl flow in two regions near the tube wall, the twisted tape wall, and in the core region. Due to swirl phenomena, an improvement in fluid mixing was observed with the use of triangular cut twisted tape. The Nusselt number improved by about 2.45 times and the friction factor increased by 9.22 times as compared to plain tubes without twisted tape. The maximum value of 1.21 as thermal performance factor was observed at Reynolds number of 5500.

KEYWORDS:

• Triangular cut
• turbulent flow
• twisted tape
• nusselt number
• friction factor
• effectiveness
• TPF
• swirl flow

Acknowledgments

This research work was supported by Department of Mechanical engineering, Maulana Azad National Institute of technology, Bhopal.

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Notes on contributors

Bhrant Kumar Dandoutiya

Bhrant Kumar Dandoutiya received M tech degree From Maulana Azad National Institute of Technology, Bhopal, India in Mechanical engineering. He is currently pursuing PhD in Maulana Azad National Institute of Technology, Bhopal in mechanical engineering on nanofluid effect on heat transfer.

Arvind Kumar

Dr. Arvind Kumar has 11 year of experience of providing knowledge resource to students and expertise in participatory and innovative teaching learning methodologies. He has done Ph.D. from Maulana Azad National Institute of Technology, Bhopal and presently working as an Assistant Professor at Maulana Azad National Institute of Technology, Bhopal. His area of research is heat transfer. He has published more than 20 research paper in various reputed and peer reviewed international/national journals and conferences. He has attended and acted as resource person in various Faculty Development Program and Short Term Training Program. Author is an member of professional societies like ISHMT and ASME.