Numerical investigation of flow and heat transfer characteristics from an impinging jet on a circular cylinder

Author

Faghani, Pedram ; Eskandari, Mehrdad ; Faghani, Ehsan

Author_Institution

Depts. of Civil Eng., Univ. of Tehran, Tehran, Iran

fYear

2010

fDate

2-5 June 2010

Firstpage

1

Lastpage

7

Abstract

A study has been made of the flow and heat transfer to a circular cylinder from an isothermal impinging air jet. Numerical solutions of the governing conservation equations have been obtained utilizing a non-orthogonal curvilinear coordinate grid. The study focused on low Reynolds numbers (based on nozzle average exit velocity and cylinder diameter) in the range of 132-1315 and H/W = 2, 4, 6 and 8 which corresponds to the ratio of distance between the nozzle and cylinder to nozzle width. The flow is stable and symmetric over the range of parameters studied. The effects of buoyancy, diffusion and cooling of the cylinder, the development of the wall jet, and the recirculating bubble all affect the flow and heat transfer. The average Nusselt number increases with increasing Reynolds. Also the distance between the nozzle and the cylinder has a strong effect on the heat transfer.

Keywords

confined flow; heat transfer; jets; laminar flow; nozzles; average Nusselt number; circular cylinder; heat transfer; isothermal impinging air jet; low Reynolds numbers; non-orthogonal curvilinear coordinate grid; nozzle; Cooling; Engine cylinders; Equations; Heat engines; Heat transfer; Isothermal processes; Temperature; Thermal conductivity; Thermal engineering; Thermal expansion; Circular Cylinder; Heat Transfer; Impinging Jet; Nusselt Number;

fLanguage

English

Publisher

ieee

Conference_Titel

Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm), 2010 12th IEEE Intersociety Conference on

Conference_Location

Las Vegas, NV

ISSN

1087-9870

Print_ISBN

978-1-4244-5342-9

Electronic_ISBN

1087-9870

Type

conf

DOI

10.1109/ITHERM.2010.5501360

Filename

5501360