flow area, this can be equated to the shell diameter. this is not a perfect comparison but it does show the relative parameters for each exchanger. with regard to flow patterns, the paraflow advantage over shell and tube designs is the ability to have equal passes on each side in full counter-current...
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nozzle. the steam leaves the nozzle at a very high velocity in the order of m/s and a proportion of the kinetic energy in the steam jet transferred, by interchange of momentum, to the body of air which is entrained and passes along with the operating steam through a diffuser in which the kinetic energy...