عنوان مقاله [English]
In most of the chemical engineering processes, the phenomena of mass and heat transfer are among their inseparable parts. In the present paper, simultaneous heat and mass transfer has been studied experimentally by a laboratory set up. In this apparatus, the existence of condensation and evaporation created due to heat transfer causes mass transfer and finally influences the coefficient of heat transfer. Also, mass transfer changes heat distribution in heat transfer phenomena that causes total change in heat flux. Thus, in this apparatus, some experiments have been carried out through changing different parameters such as temperature and flow rate for two fluids, water and air. Comparing the results obtained from these experiments and the ones gained from the process modeling, the existence of wall effect and its influence on the temperature of output water from the system were realized and process modeling was corrected again through applying wall effect. The studies conducted in the present research paper indicate that if the temperature and flow rate of air rises, the influence of wall effect increases and the change of wall effect has no significant change due to rise of the water temperature and flow rate, therefore, it is not an influential parameter.