Passive Augmentation Studies in a Double Pipe Heat Exchanger with Ellipsoidal Dimples

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Year : 2026 | Volume : 13 | 02 | Page :
    By

    Divya P Soman,

  • Jomi J Nalpat,

  • Berin Thomas,

  • Udith Mohan,

  1. Assistant Professor, Department of Safety and Fire Engineering, School of Engineering, Cochin University of Science and Technology, Kochi, Kerala, India
  2. Student, Department of Chemical Engineering, Amal Jyothi College of Engineering, P.O, Kanjirapally – Erumely Rd, Kanjirappally, Koovappally, Kerala, India
  3. Student, Department of Chemical Engineering, Amal Jyothi College of Engineering, P.O, Kanjirapally – Erumely Rd, Kanjirappally, Koovappally, Kerala, India
  4. Student, Department of Chemical Engineering, Amal Jyothi College of Engineering, P.O, Kanjirapally – Erumely Rd, Kanjirappally, Koovappally, Kerala, India

Abstract

In this work, the numerical studies of heat transfer augmentation of a counter-current double pipe heat exchanger with ellipsoidal dimples (inward-facing, raised dimples) on the inner tube was performed using SOLIDWORKS software. The effect of dimple depth, dimple pitch and number of dimples/angles between two dimples on heat transfer was investigated at a constant volumetric flow rate of 4 LPM for hot (water) and cold (water) fluids. The effect of dimple depth (1.25 & 1.5 mm), dimple pitch (10, 12 & 15 mm) and number of dimples on heat transfer was investigated and an optimum dimple configuration was obtained. Additionally, the heat transfer performance of the double pipe heat exchanger with optimum dimples in the inner tube was compared with smooth tube heat exchanger. The studies 2 revealed that all the 10 variants of ellipsoidal dimples increased the heat transfer coefficient significantly above those for the smooth tube. The heat transfer increased with increase in dimple depth and number of dimples and decreased with decrease in dimple pitch. The dimple configuration with dimple depth = 1.5 mm, dimple pitch = 12 mm and number of dimples = 744 is obtained as the optimum dimension of dimple (among the dimensions studied) that offers the highest heat transfer. From the comparison studies of double pipe heat exchanger with dimpled and smooth inner tube it was found out that the heat transfer coefficient of the former is 2.06 times higher than that of the latter with 3.2 times higher pressure drop.

Keywords: Computational fluid dynamics; double pipe heat exchanger; ellipsoidal dimple; heat transfer augmentation, heat transfer coefficient

How to cite this article:
Divya P Soman, Jomi J Nalpat, Berin Thomas, Udith Mohan. Passive Augmentation Studies in a Double Pipe Heat Exchanger with Ellipsoidal Dimples. Journal of Thermal Engineering and Applications. 2026; 13(02):-.
How to cite this URL:
Divya P Soman, Jomi J Nalpat, Berin Thomas, Udith Mohan. Passive Augmentation Studies in a Double Pipe Heat Exchanger with Ellipsoidal Dimples. Journal of Thermal Engineering and Applications. 2026; 13(02):-. Available from: https://journals.stmjournals.com/jotea/article=2026/view=250287


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Ahead of Print Subscription Review Article
Volume 13
02
Received 29/06/2026
Accepted 07/07/2026
Published 20/07/2026
Publication Time 21 Days
44

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