Abstract
Owing to the mechanisms of bubble formation and detachment during boiling, the concentration of impurities contained in the liquid can increase locally by several orders of magnitude. This may cause severe fouling even for low foulant concentrations. As the nucleation site density increases with increasing heat flux, a similar trend is expected for the deposition rates. High heat fluxes, however, are desirable as they allow smaller equipment. Using a precision pool boiling test apparatus in conjunction with a microprocessor-controlled camera and video equipment, the effects of heat flux and of CaSO 4 concentration on the formation and growth of deposits are investigated. The transient change in heat transfer is closely related to changes in bubble departure diameter, bubble frequency and bubble site density.
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