Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
651972 | Experimental Thermal and Fluid Science | 2011 | 11 Pages |
Abstract
Laminar free convection heat transfer from two vertical arrays of five isothermal cylinders separated by flow diverters is studied experimentally using a Mach-Zehnder interferometer. The width of flow diverters is kept constant to two-cylinder diameters and the cylinders vertical center-to-center spacing is equal to three-cylinder diameter. Effect of the ratio of the horizontal spacing between two cylinder arrays to their diameter (Sh/D) on heat transfer from the cylinders is investigated for various Rayleigh numbers. The experiments are performed for Sh/DÂ =Â 2-4, and the Rayleigh number based on the cylinder diameter ranging from 103 to 3Â ÃÂ 103. It is observed that for small Sh/D ratios, the flow diverters have a negative effect on the total rate of heat transfer from the arrays; while by increasing the horizontal center to center spacing, they tend to enhance the overall cooling rate of the array. Moreover, increasing Ra and Sh/D generally results in a higher average Nusselt number for each cylinder in the array.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Hossein Rezvantalab, Osameh Ghazian, Tooraj Yousefi, Mehdi Ashjaee,