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HEAT TRANSFER CHARACTERISTICS OF A HORIZONTAL CYLINDER UNDER IMPINGMENT OF LAMINAR UPWARD-DIRECTED SLOT JET FLOW

DOI: 10.1615/ICHMT.2009.CONV.440
14 pages

Shahin Amiri
School of Mechanical Engineering University of Tehran, Tehran, Iran

Kaveh Habibi
Laser Diagnostics Laboratory − School of Mechanical Engineering University of Tehran PO14395, Tehran, Iran

Mehdi Ashjaee
Department of Mechanical Engineering, University of Tehran, Tehran, Iran

Résumé

An experimental and numerical study has been carried out to investigate the heat transfer characteristics of a horizontal circular cylinder exposed to a slot jet impingement of air. A square-edged nozzle is mounted parallel with the cylinder axis and jet flow impinges on the bottom of the cylinder. The study is focused on low Reynolds numbers ranging from 120 to 1210, Grashof numbers up to Gr = 10Re2 and slot-to-cylinder spacing from 2 to 8 of the slot width. The flow field is greatly influenced by the slot exit velocity and the buoyancy force due to density change. A Mach-Zehnder Interferometer is used for measurement of local Nusselt number around the cylinder at 10 degrees interval. It is observed that the average Nusselt number decreases with increasing the jet spacing and increases with rising the Reynolds number. Numerical modeling is performed using FLUENT code and its results show good agreement with the experimental results.

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