Evaporating surface

(Steam Boilers) that part of the heating surface with which water is in contact.

See also: Evaporate

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
By increasing the flow rate of air over an evaporating surface, the rate of evaporation can be increased with a corresponding increase in cooling.
Faster mixing is also achieved by evaporating surface moisture, which can act as a barrier to wetout of the filler by the polymer.