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.
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