Flow and Heat Transfer Over a Moving Surface Due to Impinging Annular Jets

Abstract

In the present paper, fluid flow and heat transfer over a moving surface owing to an array of impinging annular jets at a constant temperature have been numerically studied at a Reynolds number of 5000. The flow field was resolved using the transition SST model with highly refined mesh. In the direction of the surface movement, a periodic element from a jet-bank design was chosen. Different nondimensional surface velocities were considered from zero (stationary surface) to two times of inlet jet velocity. It is observed that both the flow field and thermal performance of the jet is strongly affected by the surface motion. The initial symmetric distribution alters when the surface motion increases up to a particular degree of surface velocity, and the average heat transfer decreases. When surface motion exceeds this threshold, net heat transmission increases which leads to the more uniform and enhance heat transfer for high surface velocity cases.