Flow and heat transfer over a trapezoidal cylinder: steady and unsteady regimes

Dhiman, Amit and Hasan, Mudassir (2012) Flow and heat transfer over a trapezoidal cylinder: steady and unsteady regimes. Asia-Pacific Journal of Chemical Engineering, 8 (3). pp. 433-446. ISSN 1932-2135


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Official URL: http://dx.doi.org/10.1002/apj.1678


: Two-dimensional unconfined flow and heat transfer across a long tapered trapezoidal bluff body are investigated for the range Re = 1 to 150 (thereby covering both steady and unsteady periodic regimes) and Pr = 0.7 (air). A number of engineering parameters, e.g. drag and lift coefficients, Strouhal and Nusselt numbers, and others, is calculated for the above range of conditions. No flow separation occurs from the surface of the trapezoidal cylinder for the range Re ≤ 5; however, flow starts to separate from the rear surface of the cylinder at Re = 6. Therefore, the onset of flow separation exits between Re = 5 and 6. The critical value of the Reynolds number (i.e. transition from steady to unsteady) exists between Re = 46 and 47. The drag coefficient decreases with increasing Reynolds number in the steady regime; however, the drag increases with Reynolds number in the unsteady regime. The Strouhal number and the average Nusselt number increase with increasing value of the Reynolds number. Finally, the simple correlation for the average Nusselt number is obtained in the steady flow regime.

Item Type: Article
Subjects: Chemical Engineering
Divisions: College Of Engineering > Chemical Engineering
Depositing User: MUDASSIR HASAN
Date Deposited: 26 Nov 2017 11:22
Last Modified: 26 Nov 2017 11:22
URI: http://eprints.kku.edu.sa/id/eprint/1352

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