Numerical simulation of transport phenomena due to array of round jets impinging on hot moving surface

ABSTRACT

An attempt has been made to numerically evaluate the heat transfer from a moving surface due to impingement of array of round jets. This paper reports the effect of surface velocity on heat transfer. Transition SST model has been used for simulation to predict heat transfer under laminar, transition, and turbulent regimes. This model has been used as it bridges all flow conditions seamlessly. The computational domain considered in this study is a 3D model with symmetric planes on two sides and periodic interface on two sides, so as to represent an array of round jets. The range of Reynolds number adopted here is 100–5,000. Results were first validated with the correlation given by Martin^[1] for array of round nozzles with stationary isothermal surface under turbulent conditions with an average error of 5.88%. It is observed that at higher surface velocities, the heat transfer from the moving surface is more than the case of heat transfer from a stationary surface. The value of surface velocity at which the heat transfers from moving surface is minimum decreases with increase in Reynolds number. An artificial neural network has been trained to accurately predict the Nusselt number for the given Reynolds number and surface velocity.

KEYWORDS:

• ANN
• array of round jets
• impingement of jets
• transition flow