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+clc;

+clear all;

+disp("different types of processes for condensation of capours on a solid surface")

+disp("there are two types of methods for condensation")

+disp("filmwise - in which condensation wets the surface forming a continuous film whic corners the entire surface")

+disp("dropwise - in which vapour condenses into small droplets of various sizes which fall down the surface in a random fashion")

+disp("filmwise - generally occurs on clean uncontaminated surfaces.")

+disp("in this type of condensation the film covering the entire surface grows in thickness as it moves down the surface by gravity.")

+disp("There exists a thermal gradient in the film and so it acts as a resistance to heat transfer")

+disp("Although a dropwise condensation would be preferred to filmwise condensation yet it is extremely difficult to achieve and maintain")

+disp("This is because most surface become wetted after being exposed to condensing vapours over a period of time. ")

+disp("Dropwise condensation can be obtained under controlled conditions with the help of certain additives to the condensate and various surface coatings,")

+disp("But its commercial viability has not yet been proved")

+disp("For this reason the condensaing equipments in use are designed on the basis of filmwise condensation.")

+