The Use of Volume Averaging Theory (VAT) for Evaluation of Surface Heat Transfer Augmentation

A model, based on Volume Averaging Theory (VAT), was developed to predict friction and heat transfer over augmented surfaces. The objective is to find augmentation that produces a higher heat removal relative to the increase in pumping power necessary to overcome the additional friction that is generated. This was accomplished with a numerical solution of the VAT transport equations for describing fully developed turbulent flow in a channel with augmented surfaces. Friction factor and Nusselt number results produced by the numerical simulation are compared with experimental data to validate the model and which of the augmented surfaces performs the best is clearly show.