A CFD study on the effect of spacer orientation on temperature polarization in membrane distillation modules

Influence of the boundary conditions on heat and mass transfer in spacer-filled channels

“…Yet another alternative is to replace the bulk temperature in the definition (6) of h with a different reference value, e.g. the fluid's temperature at the channel midplane [9] or the fluid's inlet temperature [10]. In the case of mass transfer, temperature is replaced by concentration and h is replaced by a mass transfer coefficient k (in m s -1 ).…”

“…(7) with r ext =0.00625 m 2 K/W (corresponding to R=0.75 for the geometry investigated) at one of the walls (active, top wall), the opposite wall being adiabatic. Only Shakaib et al [10] explicitly simulated both the hot and the cold fluid, thermally coupled through a membrane of prescribed thickness and thermal conductivity.…”

“…Among computational studies of membrane processes, both the one-side configuration (a) [7,10,14,23,24] and the two-side, symmetric configuration (c) [11,9,13] have been considered. For the case of a spacerless plane channel subjected to hydrodynamically and thermally fully developed flow, the difference in the Nusselt numbers for one-side and two-side heat transfer is illustrated in Figure A.1.…”

Experimental and theoretical analyses of temperature polarization effect in vacuum membrane distillation

“…Researchers has taken advantage of the availability of powerful computers along with advanced Computational Fluid Dynamic (CFD) modeling packages and started to simulate the behavior of the fluid thin film near the membrane surface [11][12][13][14][15][16][17][18][19]. The central focus of these simulation studies has been to investigate the turbulence promoter's effect on the fluid temperature, velocity and pressure profiles near the membrane surface to see how these promoters could enhance the water vapor flux.…”

CFD prediction of scalar transport in thin channels for reverse electrodialysis

“…It is commonly employed for studying other membrane separation processes such as Membrane Distillation (MD) [21][22][23] and Reverse Osmosis (RO) [24,25].…”