AUGMENTATION OF CONVECTIVE HEAT-TRANSFER BY AN EFFECTIVE UTILIZATION OF DROPLET INERTIA

Flow characteristics and heat transfer of a water droplets laden how b ehind a backward-facing step have been experimentally and numerically investigated for the condition of isothermally heated dry wall. Two si zes of step heights were employed corresponding to Re-H = 5.3 x 10(3), 1.1 x 10(4). Numerical simulations were performed by a standard k-eps ilon model for the gas phase and a Lagrangian stochastic model for the trajectories of droplets. The experimental and numerical results show ed that large heat transfer enhancement existed downstream of the reat tachment region and was correlated well with the ratio of time scale b etween an appropriate time scale of the turbulent flow and the relaxat ion time of droplet.