Flow and Heat Transfer in a Pinched Helical Coil

Nilesh S. Hasabnis, Vivek V. Ranade*

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In a laminar flow regime, heat transfer performance of a helical coil is better than straight pipes due to secondary flows. This advantage of helical coil over straight pipe however vanishes for a turbulent flow regime. Recently, a concept of pinched pipe has been proposed to enhance heat transfer in laminar as well as turbulent flow regimes. Here, a combination of these two passive methods of heat transfer augmentation, helical coil and pinching of pipes, (pinched helical coils) is proposed and computationally investigated for its performance in laminar as well as in turbulent flow regimes. Initially, a computational model was developed to solve fully developed flow and heat transfer in helical coils. The method was validated by reproducing published experimental results for a helical coil. The computational model was further used to investigate flow and heat transfer characteristics of a pinched helical coil. The simulations were carried out in laminar and turbulent regimes (Re range of 100–30,000). It was observed that in a turbulent regime, the heat transfer performance of a pinched helical coil is slightly better (10–20%) compared to a normal helical coil. The computational model and results will be useful for devising better passive intensification strategies.

Original languageEnglish
Pages (from-to)1-14
Number of pages14
JournalIndian Chemical Enginer
Volume57
Issue number1
Early online date21 Oct 2014
DOIs
Publication statusPublished - Mar 2015
Externally publishedYes

Keywords

  • Computational Fluid Dynamics (CFD)
  • Heat transfer
  • Pinched helical coil
  • Pressure drop

ASJC Scopus subject areas

  • Chemical Engineering(all)

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