Effect bore liquid flow rate

Liquid 2 is introduced through the bore of the porous hollow fibers from one end and flows out to the other side, in effective countercurrent flow to liquid However, locally on both sides of the baffle, liquid ti is in crossflow around each hollow fiber and therefore around liquid 4-Since crossflow introduces very efficient liquid-phase mass transfer at a low Reynolds number in such systems, it is preferable to introduce that liquid phase to the shell side whose resistance is likely to control the mass-transfer/ solvent extraction rate. Further, the liquid phase wetting the pores of the membrane should prefereably be the lower resistance phase. These considerations are described in detail in Prasad and Sirkar (2001) for both porous hydro-phobic as well as porous hydrophilic membranes. 

One thus sees that, if the molecular shaping forces did not exist, the channel with a liquid wall would present in hollow, and upwards, a form similar to that which is presented in relief, and from top to bottom, by the seemingly smooth part of a hquid stream running out from a circular opening bored in a thin wall in the horizontal base of a vessel, and we know that, in all the extent of this smooth part, the effect of the shaping forces remains very marked moreover, just as the smooth part of a liquid stream all the more approaches to be cylindrical as the rate of flow is larger, in the same way our channel would aU the more approach to constitute a hollow cylinder as the speed of gas would be more considerable. 

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