Experimental and numerical investigations of heat transfer characteristics for impinging swirl flow

Sami D. Salman, Abdul Amir H. Kadhum, Mohd Sobri Takriff, Abu Bakar Mohamad

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

This paper reports experimental and computational fluid dynamics (CFD) modelling studies to investigate the effect of the swirl intensity on the heat transfer characteristics of conventional and swirl impingement air jets at a constant nozzle-to-plate distance (L=2D). The experiments were performed using classical twisted tape inserts in a nozzle jet with three twist ratios (y=2.93, 3.91, and 4.89) and Reynolds numbers that varied from 4000 to 16000. The results indicate that the radial uniformity of Nusselt number (Nu) of swirl impingement air jets (SIJ) depended on the values of the swirl intensity and the air Reynolds number. The results also revealed that the SIJ that was fitted with an insert of y=4.89, which corresponds to the swirl number Sw = 0.671, provided much more uniform local heat transfer distribution on the surface. The CFD-predicted results help to explain the experimental measurements in terms of the turbulence intensity. Furthermore, the predicted and measured local Nusselt numbers were consistent with each other.

Original languageEnglish
Article number631081
JournalAdvances in Mechanical Engineering
Volume2014
DOIs
Publication statusPublished - 2014

Fingerprint

Heat transfer
Nusselt number
Air
Nozzles
Computational fluid dynamics
Reynolds number
Die casting inserts
Tapes
Turbulence
Experiments

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Experimental and numerical investigations of heat transfer characteristics for impinging swirl flow. / Salman, Sami D.; Kadhum, Abdul Amir H.; Takriff, Mohd Sobri; Mohamad, Abu Bakar.

In: Advances in Mechanical Engineering, Vol. 2014, 631081, 2014.

Research output: Contribution to journalArticle

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