Enhancement of Free Convection Heat Transfer from a Vertical Array of Isothermal Cylinders by Flow Diverters |
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| Authors: | Mehdi Ashjaee Tooraj Yousefi Siamak Farahmand Ehsan Chavoshi |
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| Affiliation: | 1. Mechanical Engineering Department , University of Tehran , Iran;2. Mechanical Engineering Department , Razi University , Kermanshah, Iran |
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| Abstract: | Free convection heat transfer from a vertical array of five horizontal isothermal cylinders separated by flow diverters is investigated experimentally through a Mach-Zehnder interferometer. Flow diverters with widths of 1, 2, and 3 cylinder-diameter are placed midway between the cylinders with a 45-degree inclination angle. The cylinders vertical center to center spacing is kept constant to three-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 and for different flow diverter width. It is observed that the flow diverters enhance the heat transfer of the array from 10% to 27%, depending on their width. By increasing the width of the diverters and the Rayleigh number, enhancement of the heat transfer from the array increases. |
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