The Effects of Dimples on Heat Transfer and Fluid Flow on a Circular Tube: A Computational Investigation.

The use of similar sort of dimples with different arrangements i.e., by changing the linear and angular distance between the dimples have different effects of their own. This present work is analyzed numerically for a three-dimensional circular tube with different types of dimples with different arrangements on its inner surface. In this paper, it was found that using spherical dimples leads to a great amount of increase in the heat transfer rate as compared to that of a normal tube without dimples. It was also found that the change of shape from spherical to rectangular box type of dimples of similar size didn't create much considerable difference in the improvement of heat transfer characteristics. Eventually, the spherical dimples were found to be more efficient than the rectangular box type dimples. However, the change of dimple arrangement from inline to staggered arrangement enhances the heat transfer characteristics to a noticeable amount, which was not of very high in magnitude compared to others but may further be studied for higher scale implementation with some corresponding moderations. [ABSTRACT FROM AUTHOR]