A parametric study into a passively enhanced heat separation system

In the interest of minimising the amount of work required to enhance thermal separation, a passively induced thermal separation has been investigated. This work is motivated by the recently introduced mechanism of Azanov and Osiptsov (Int J Heat Mass Trans, 106, 1125-1133, 2017) [1]. Two methods of reducing the adiabatic wall temperatures have been proposed. Firstly, a modification to the de Laval nozzle from single to dual and triple supersonic nozzles to reduce the degree of aerodynamic heating at the supersonic channel walls. The latter is conducted with a separation to the supersonic flow regime into three parallel interfacing flow sub-regimes. Secondly, the introduction of water droplets into the supersonic flow channel to absorb the evaporation latent heat equivalent energy. The droplet evaporation has shown a noticeable enhancement in the cooling effects with up to 8℃ temperature drops. The model has been compared to the experimental data for compatible results.