Effect of helical surface disc turbulator on thermal and friction characteristics of double pipe water to air heat exchanger

The effect of helix angle and pitch ratio of helical surface disc turbulators on the thermal performance of double pipe heat exchanger are discussed in this study. Tests are performed with air as working fluid for different pitch ratios, numerous helix angles, and various Reynolds number. Water and...

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Bibliographic Details
Published in:Experimental heat transfer 2021-01, Vol.34 (1), p.51-67
Main Authors: Yadav, Saurabh, Sahu, Santosh K
Format: Article
Language:English
Subjects:
Aerodynamics
Fluid dynamics
Fluid flow
heat exchanger
Heat exchangers
helical surface disc turbulators
Nusselt number
Pipes
Reynolds number
thermal enhancement factor
Working fluids
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Summary:The effect of helix angle and pitch ratio of helical surface disc turbulators on the thermal performance of double pipe heat exchanger are discussed in this study. Tests are performed with air as working fluid for different pitch ratios, numerous helix angles, and various Reynolds number. Water and air are allowed to flow along inner tube and through annulus, respectively. In each case, the thermal enhancement factor is observed to be higher than unit value. Smallest pitch ratio and highest helix angle yield highest thermo-hydraulic performance of 1.39 at Re = 3,500. Correlations are developed for various parameters.
ISSN:0891-6152
1521-0480
DOI:10.1080/08916152.2020.1714819