Unsteady heat transfer of steam flow with condensation in porous media

A fundamental study is performed experimentally and theoretically to evaluate the transient heat transfer fbr a steam flow injected into a porous medium with condensation and re-evaporation. A porous plane board made of calcium silicate was used. Transient changes of the temperature distributions on the surface of porous board are measured by the infrared ray therm,graph. The board temperature at the opposite surface of the steam impinging point increases with increasing the steam pressure, however, no obvious influences is not bund by changing the nozzle diameter. A three dimensional numerical analysis is performed: Momentum equation for steam based on Darcy's model is employed. By introducing an enthalpy transforming scheme, energy equation is converted into a non-linear equation with the enthalpy being single dependent variable. The three dimensional model to treat the diffusion of condensed water affecting porous material properties is newly developed to estimate the saturation of condensed water. The SIMPLE algorithm is used. Both experimental and numerical results show good agreement in terms of temperature transients induced by steam flow with phase change in the porous media.