CALCIUM-CARBONATE SCALE FORMATION DURING SUBCOOLED FLOW BOILING

Scale deposition on the heat transfer surfaces from water containing d issolved salts considerably reduces fuel economy and performance of th e heat transfer equipment. I, general, this problem is more serious du ring nucleate boiling clue to the mechanisms of bubble formation and d etachment. In this study, a large number of experiments were performed to determine the effect of fluid velocity, initial surface temperatur e, and bulk concentration on the rate of calcium carbonate deposition on heat transfer surfaces during subcooled flow boiling. A physically sound prediction model for the deposition process under these operatin g conditions has been developed which predicts the experimental data w ith good accuracy. Two previously published models are also discussed and used to predict the experimental data.