Abstract
This article presents heat transfer characteristics of circular and elliptic cylinders in cross flow for various Reynolds numbers. Numerical investigations as well as wind tunnel experiments are carried out to study the convective heat transfer of in-line cylinder banks. In particular, the heat transfer characteristics of upstream and downstream cylinders are compared in terms of local and average Nusselt numbers. The effects of turbulence induced by upstream cylinders on the heat transfer of downstream cylinders are discussed with the help of detailed numerical results.
Highlights
With increasing demands for energy saving in recent years, it is of great importance to design efficient heat exchangers which have high heat transfer rate and low pressure loss
The heat transfer characteristics of single circular and single elliptic cylinders are compared for Reynolds number ranging from 7150 to 50,350
The undershoot of the local Nusselt number at the position of the flow separation is more pronounced at the circular cylinder than the elliptic cylinder
Summary
With increasing demands for energy saving in recent years, it is of great importance to design efficient heat exchangers which have high heat transfer rate and low pressure loss. Heat transfer characteristics of cylinders in cross flow have been the subject of particular interest for the development of efficient heat exchangers. Achenbach[2] measured local and total heat transfer of single circular cylinder in cross flow for high Reynolds number ranging from 30,000 to 4,000,000. He measured the local static pressure and skin friction to investigate the boundary-layer effect on the heat transfer. Scholten and Murray[3] had measured timeresolved local velocity and local heat flux on the surface of single circular cylinder, and the details of the flow and heat transfer characteristics were discussed. Analytical approach for heat transfer of circular cylinder bank has been investigated by Khan et al.[6]
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