Experimental Investigation of Heat Transfer and Pressure Drop inside Elliptic Tube with Inserted Helical Coils.
Ibrahim, E., Mohamed, M., Omara, M., Badawy, A. (2020). Experimental Investigation of Heat Transfer and Pressure Drop inside Elliptic Tube with Inserted Helical Coils.. EKB Journal Management System, 43(3), 24-33. doi: 10.21608/bfemu.2020.95738
Emad Zidan Ibrahim; Mohamed Abd Halim Mohamed; Mohamed Omara; Ahmed ElSaid Badawy. "Experimental Investigation of Heat Transfer and Pressure Drop inside Elliptic Tube with Inserted Helical Coils.". EKB Journal Management System, 43, 3, 2020, 24-33. doi: 10.21608/bfemu.2020.95738
Ibrahim, E., Mohamed, M., Omara, M., Badawy, A. (2020). 'Experimental Investigation of Heat Transfer and Pressure Drop inside Elliptic Tube with Inserted Helical Coils.', EKB Journal Management System, 43(3), pp. 24-33. doi: 10.21608/bfemu.2020.95738
Ibrahim, E., Mohamed, M., Omara, M., Badawy, A. Experimental Investigation of Heat Transfer and Pressure Drop inside Elliptic Tube with Inserted Helical Coils.. EKB Journal Management System, 2020; 43(3): 24-33. doi: 10.21608/bfemu.2020.95738

Experimental Investigation of Heat Transfer and Pressure Drop inside Elliptic Tube with Inserted Helical Coils.

MEJ- Mansoura Engineering Journal
Article 7, Volume 43, Issue 3, September 2018, Page 24-33  XML PDF (487.82 K)
Document Type: Research Studies
DOI: 10.21608/bfemu.2020.95738
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Authors
Emad Zidan Ibrahim1; Mohamed Abd Halim Mohamed2; Mohamed Omara2; Ahmed ElSaid Badawy email 3
1Mechanical Engineering Department, Faculty of Engineering Zagazig University
2Mechanical Department, Faculty of Industrial Education, Suez University
3Teacher, Industrial Technical School, Zagazig, Egypt
Abstract
The paper deals with an experimental study of the influence of varying helical coil cross section diameter and pitches of helical coil on heat transfer and friction characteristics in an elliptical tube. The present work studies the effects of copper helical coils of circular cross section formed with different diameters of 2 and 6 mm at varying pitches (20, 45, 135 and 225 mm) inside elliptic tube. In the experiments, cold air at ambient condition is passed through the uniform heat flux circular tube for Reynolds numbers in a range of 11000 to 37500. The experimental results demonstrate that the use of helical coil inserts in elliptic tube leads to a higher heat transfer rate than that of the plain surface tube. Also, increasing helical coil cross section diameter and decreasing pitches of the helical yield a better heat transfer than the plain tube. The enhancement efficiencies of the helical coil cross section 6 mm over wire cross section 2 mm diameter at a pitch of 20 mm is 2.3% at Re=11000. The results are also correlated in the form of Nusselt number, friction factor and enhance efficiency as a function of Reynolds number, pitches and diameter of helical coil
Keywords
Heat transfer; Turbulent flow, Helical coil; Elliptic tub
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