Specific ascension force

This is presented schematically in Fig. 6.3, which also shows that the kinetics of these processes is described by the transport rate of A from the wall to the adjacent media. Using Fig. 6.3, we can establish that two elementary processes are presented in this system. The first is the flow induced by the concentration gradient and the second is the mass transfer sustained by the processes on the surface (a chemical reaction in the case of the metal placket immersed in a specifically formulated liquid and the transport through the porosity in the case of the drying wall). The case presented here corresponds to the situation when, in respect of the bulk density, the fluid density begins to decrease near the wall. This generates the displacement of the media and the specific ascension force, which is equivalent to the density difference. This phenomenon depends on the concentration difference in fluid A Aca=(cap - c ). From Fig. 6.3 we can write a list of process variables ... 

Displacement properties specific ascension force (gP,.Ac ,). Interaction properties mass transfer coefficient (k,.). 

Specific ascension force gptAt Heat transfer coefficient a... 

If we analyze the case of the rectification column which loses heat by natural convection, then we change the list of variables by considering the specific ascension force, gPtAt, as an important variable and by removing the fluid velocity, w. In this case, the application of the pi theorem shows that ... 

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See also in sourсe #XX -- [ ]

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