CORRELATION BETWEEN HEAT-TRANSFER AND DISSIPATION OF FLOW ENERGY IN PACKED SPHERES

The paper describes a new approach to generalization of experimental d ata on heat- and mass transfer in packed spheres, based on the correla tion between heat- and mass transfer and dissipation of flow energy, t hat enables one to describe the known experimental data for diverse st ructures of packed spheres for given hydraulic resistance. The correla tion between heat transfer and hydraulic resistance of packed spheres is confirmed. The herein described procedure is convenient in that it is universal, that is, suitable for estimation of heat- and mass trans fer in diverse porous media, and does not involve any fitting ''form f actors.'' The role of form factor is played by the coefficient of hydr aulic resistance of the given porous structure or by the power require d to pump through the heat-transfer agent, which are very sensitive to the structure of the porous medium and can be measured relatively eas ily and fairly accurately. Estimates are made of the relative pressure losses for friction and of the rate of friction that defines heat tra nsfer in the spheres. It is shown that the proposed model of correlati on between heat- and mass transfer in the spheres and their hydraulic resistance is applicable at Re-e > 100.