Local and average heat transfer by forced convection from a circular cylinder is studied for Reynolds number from 2 × 103 to 9 × 104 and Prandtl number from 0.7 to 176. For subcritical flow, the local heat transfer measurement indicates three regions of flow around the cylinder: laminar boundary layer region, reattachment of shear layer region and periodic vortex flow region. The average heat transfer in each region is calculated and correlated with the Reynolds number and the Prandtl number. The Nusselt number in each region strongly depends on the Reynolds number and the Prandtl number with different power indices. An empirical correlation for predicting the overall heat transfer from the cylinder is developed from the contributions of heat transfer in these three regions.
|Original language||English (US)|
|Number of pages||11|
|Journal||International Journal of Heat and Mass Transfer|
|State||Published - Oct 2004|
Bibliographical noteFunding Information:
Support from the Engineering Research Program of the Office of Basic Energy Science at the US Department of Energy and from the King Mongkut's University of Technology Thonburi (KMUTT) in the form of a fellowship for S. Sanitjai is gratefully acknowledged.
- Circular cylinder
- Heat transfer
- Prandtl number
- Reynolds number