Heat Transfer and Pressure Drop of an Angled Discrete Turbulator at Elevated Reynolds Numbers Up to 900,000

Author:

Ghazi-Hesami Sam12,Wise Dylan3,Taylor Keith4,Ireland Peter3,Robert Étienne5

Affiliation:

1. Department of Mechanical Engineering, Polytechnique Montréal, Montréal, Québec H3T 1J4, Canada;

2. Siemens Energy Canada Ltd., Montréal, Québec H9P 1A5, Canada;

3. Oxford Thermo-Fluids Institute, Department of Engineering Science, University of Oxford, Osney Mead, Osney Mead Industrial Estate, Oxford OX2 0ES, UK

4. Siemens Energy Canada Ltd., Montréal, Québec H9P 1A5, Canada

5. Department of Mechanical Engineering, Polytechnique Montréal, Montréal, Québec H3T 1J4, Canada

Abstract

Abstract Turbulators are a promising avenue to enhance heat transfer in a wide variety of applications. An experimental and numerical investigation of heat transfer and pressure drop of a broken V (chevron) turbulator is presented at Reynolds numbers ranging from approximately 300,000 to 900,000 in a rectangular channel with an aspect ratio (width/height) of 1.29. The rib height is 3% of the channel hydraulic diameter, while the rib spacing to rib height ratio is fixed at 10. Heat transfer measurements are performed on the flat surface between ribs using transient liquid crystal (LC) thermography. The experimental results reveal a significant increase of the heat transfer and friction factor of the ribbed surface compared with a smooth channel. Both parameters increase with Reynolds number, with a heat transfer enhancement ratio of up to 2.15 (relative to a smooth channel) and a friction factor ratio of up to 6.32 over the investigated Reynolds number range. Complementary computational fluid dynamics (CFD) Reynolds-averaged Navier–Stokes (RANS) simulations are performed with the κ-ω shear-stress transport (SST) turbulence model in ansys fluent® 17.1, and the numerical estimates are compared against the experimental data. The results reveal that the discrepancy between the experimentally measured area-averaged Nusselt number and the numerical estimates increases from approximately 3% to 13% with increasing Reynolds number from 339,000 to 917,000. The numerical estimates indicate turbulators enhance heat transfer by interrupting the boundary layer as well as increasing near surface turbulent kinetic energy (TKE) and mixing.

Funder

Natural Sciences and Engineering Research Council of Canada

Publisher

ASME International

Subject

Fluid Flow and Transfer Processes,General Engineering,Condensed Matter Physics,General Materials Science

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