No abstract

In industrial devices like heat recovery systems, heat pumps, as well as symmetric and complex engineering systems, a nano fluid mixture is used. Regarding the nature of the energy sources (thermal or thermal and electrical), many physical systems could represent possible applications in manufactural activities. The presence of nanoparticles inside a solvent is of great interest in order to optimize the efficacy of the nano-technology systems. The present work deals with heat and mass transfer through a vertical channel where an alumina/water film mixture flows on one of its plates. For simulation, we use a numerical method under mixed convection during water/alumina nano fluid evaporation. We heat the flown plate uniformly while the other is dry and exchange heat with a constant coefficient. The gas mixture enters channel with a constant profile. Results show that an augmentation of the volume rate of the nanoparticle disadvantages evaporation if the heating is absent. Otherwise, if the heating exists, an increasing volume rate of the nanoparticle advantages evaporation. We found also that the film velocity behavior when the volume rate of the nanoparticle varies, independent of the heating.

In this paper, we analyze the evaporation of a seawater film by mixed convection of humid air. The flown plate is heated and the second plate is dry and can exchanges heat with the environment, be isothermal or adiabatic. Using adequate approximations, we build up a nonlinear form of the Navier–Stokes equations, which is specific for the boundary layer case. We take into account the variation of the salt concentration because of the phase change along the vertical channel. Consequently, to find a solution for combined heat and mass transfers through the channel, we use a numerical finite difference method. The effect of salinity on transfer is taken into account. We found that adding salt to freshwater economizes energy to enhance the film temperature, and the latent heat flux is lower. In addition, we show that the influence of film matter quantity is clearer for saltwater when compared with freshwater case. However, we demonstrate that the effect of the film temperature at the entry and supply heating variations reminds constantly if we compare saltwater and freshwater.