UNSTEADY FREE-CONVECTION FLOW OVER A CONTINUOUS MOVING VERTICAL SURFACE

The problem of heat transfer in the unsteady free convection flow over a continuous moving vertical sheet in an ambient fluid has been inves tigated. Both constant surface temperature and constant surface heat f lux conditions have been considered. The nonlinear coupled partial dif ferential equations governing the flow have been solved numerically us ing the Keller box method and the Nakamura method which both give clos ely similar solutions. The results indicate that the cooling rate of t he sheet can be enhanced by increasing the buoancy parameter or the ve locity of the sheet. It is found that a better cooling performance cou ld be achieved by using a liquid as a cooling medium rather than a gas . The overshoot in the velocity occurs near the surface when the buoya ncy parameter exceeds a certain critical value.