Recent advancement in heat transfer and fluid flow characteristics in cross flow heat exchangers

The cross-flow heat exchanger is a special type of heat exchanger involving the exchange of heat in the case of two fluids flowing in an orthogonal direction. The heat exchanger often comprises of a number of cylinders carrying hot fluid, along with the colder fluid flowing across/over the tubes or cylinders. The system also comprises of additional fins across the tube cross-section along with delta winglets so as to generate the additional turbulence for increasing the rate of heat transfer. The addition of vortex generators helps in promoting system miniaturization. Moreover, the implementation of the passive techniques in cross-flow heat exchangers significantly escalates the pumping power requirement. Thereby, the objective of this paper is to carry out a review on the recent developments and their potential candidature for improving the thermal performance of heat exchanger. The latest state-of-the-art developments are deeply discussed with its evaluating parameters and some recommendations are made for further investigation in this area.