A hydrophobic surface has been produced on condenser tube surfaces by injection of montan wax and related chemicals into the‐condensing steam. The extent and duration of the increase in the overall heat‐transfer coefficient of the condenser, that results from the condensation of steam in discrete drops on the hydrophobic surface, have been measured. It is shown that the most successful dropwise condensation promoters are those waxes with the highest proportion of acidic groups, and that these are most effective when used with copper or copper alloy condenser tubes.
A method of removing the soluble part of a gas mixture by foam is described. The foam bed is formed by passing the mixture through a porous plate over which a suitable absorbent liquid is caused to flow. The process is illustrated by some results from experiments designed to remove carbon dioxide from the air. It is shown that high coefficients of absorption are obtained and that for the conditions specified the method is superior to the use of the conventional packed tower.
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