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Heat Transfer Research
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ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v41.i2.60
pages 187-205

Flow Diverter Optimum Angle to Enhance Free Convection Heat Transfer from a Vertical Array of Isothermal Tubes

Mehdi Ashjaee
Department of Mechanical Engineering, University of Tehran, Tehran, Iran
Siamak Farahmand
Faculty of Mechanical Engineering, University of Tehran, Tehran, Iran
Ehsan Chavoshi
Faculty of Mechanical Engineering, University of Tehran, Tehran, Iran
Tooraj Yousefi
Mechanical Engineering Department, Razi University, Kermanshah, Iran

RÉSUMÉ

Effect of a flow diverter inclination angle on free-convection heat transfer from a vertical array of five isothermal horizontal tubes has been investigated experimentally using a Mach-Zehnder interferometer. Four fiberglass flow diverters with the width of a 3-cylinder diameter are placed parallel and midway between the tubes at an inclination angle of 30°, 45°, and 60°. The tubes vertical spacing (centre-to-centre) is kept constant to a 3-cylinder diameter. The experiments are carried out for various Rayleigh numbers based on the cylinder diameter in the range of 103 to 2.5 × 103 . Also the flow diverters of a 45° inclination angle which are made of copper are used in the experiments to study the effect of diverters' thermal conductivity on heat transfer from the array. Up to a maximum of 30% increase in heat transfer from the array is observed with a fiberglass flow diverter at an angle of 45°. Also a 10% decrease in the Nusselt number is occurred for the copper diverters with respect to fiberglass ones. The enhancement in heat transfer decreases as the flow diverter angle deviates from 45° for all Rayleigh numbers.


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