Heat transfer augmentation and flow visualization with delta winglets in a tube: A numerical approach

Md Islam, Liang Guangda, Md Mahbub Alam

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

In this research, heat transfer and pressure penalty from a circular tube with delta winglets insert are numerically investigated through Computational Fluid Dynamics (CFD) methodology. Numerical analysis with and without vortex generators (VGs) insert in a tube are done for a turbulent air flow, Reynolds number ranging from 6000 to 33000, under constant heat flux condition on the circular tube model surface. In our current research, we employed the shear stress transport (SST) k-omega model. The Nusselt number and friction factor results show the influence of the VGs insert on thermal performance. Effects of different winglet attack angles and blockage ratios on thermal performance enhancement were examined. Thermal performance is enhanced 5.1-30.7% using winglets in a tube. It is observed that small blockage ratio, B= 0.1 performed better than its counterpart of 0.2 and 0.3 for all the Reynolds number and for the same attack angle. The attack angle β=15°and 30° showed better thermal performance enhancement at lower Re while at higher Re, β= 15° showed better performance. The maximum enhancement obtained for β= 30° and B = 0.1. Winglet vortex generator could create swirling flow when attack angle is 0 or 15°. When attack angle is increased, both swirling flow and longitudinal vortices appeared. At attack angle of 45°, large longitudinal vortices was found.

Original languageBritish English
Title of host publicationASME 2020 Heat Transfer Summer Conference, HT 2020, collocated with the ASME 2020 Fluids Engineering Division Summer Meeting and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels
ISBN (Electronic)9780791883709
DOIs
StatePublished - 2020
EventASME 2020 Heat Transfer Summer Conference, HT 2020, collocated with the ASME 2020 Fluids Engineering Division Summer Meeting and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels - Virtual, Online
Duration: 13 Jul 202015 Jul 2020

Publication series

NameASME 2020 Heat Transfer Summer Conference, HT 2020, collocated with the ASME 2020 Fluids Engineering Division Summer Meeting and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels

Conference

ConferenceASME 2020 Heat Transfer Summer Conference, HT 2020, collocated with the ASME 2020 Fluids Engineering Division Summer Meeting and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels
CityVirtual, Online
Period13/07/2015/07/20

Keywords

  • Circular tube
  • Delta winglet
  • Heat transfer enhancement
  • Winglet vortex generator

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