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Heat Transfer Research
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ISSN Druckformat: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v49.i18.80
pages 1867-1883

THERMOHYDRAULIC PERFORMANCE OF A CHANNEL EMPLOYING WAVY POROUS SCREENS

L. Cramer
Mechanical and Aeronautical Engineering Department, University of Pretoria, South Africa
Gazi I. Mahmood
Department of Mechanical and Aeronautical Engineering, University of Pretoria, Gauteng, RSA
Josua Petrus Meyer
Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria, Private Bag X20, Hatfield, 0028, South Africa

ABSTRAKT

Porous inserts are commonly employed in the heat exchanger channels to enhance the thermal performance. The present experimental investigations measure the pressure drop and heat transfer in a rectangular channel that employs a sinusoidally shaped porous screen mesh as inserts. Four screens with different forms of sinusoidal wave are employed: 68% porosity–12-mm period, 48% porosity–12-mm period, 68% porosity–18-mm period, and 48% porosity–18-mm period. The peak-to-peak height of the wave is 5 mm and touches the channel walls along the wave vectors that are parallel to the mean flow. Measurements in the smooth channel are used to normalize the friction factors and Nusselt numbers in the screen channel and provide the enhancements of friction factors f/f0 and Nusselt numbers Nu/Nu0 due to the screens. The Reynolds number Re based on the channel hydraulic diameter varies between 400 and 11,000. The results indicate that the friction factor f, average Nusselt number Nu, Nu/Nu0, and f/f0 in the screen channel depend strongly on Re. The screen porosity and wave period effects are significant on the f and f/f0 only. The thermal performance index, (Nu/Nu0)/(f/f0)(1/3), is also influenced strongly by Re. The present results thus indicate the viability of the wavy porous inserts for heat exchangers.


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