Abstract
Application of ultrasound to the heat exchanger handling supersaturated solution of CaSO4 has been investigated with an objective reducing scale formation and in-situ cleaning. A lab-scale double pipe heat exchanger, equipped with 6 transducers each of 33 kHz, was applied to understand effect of various process and ultrasonic parameters. Application of ultrasound for 10 min at 200 W power at every 4 h resulted in reduction in average fouling resistance by 36.82 %, 42.87 % and 43.74 % at flow rate of 150 ml/min, 300 ml/min and 600 ml/min respectively. Quantity of salts precipitated in the bulk under these conditions were 1.4 to 2.6 times more than without the application of ultrasound confirming intensification. SEM analysis revealed that formed scale was dominated by platelets and needle type of CaSO4 crystals. Application of ultrasound on the heat exchanger surface was elucidated as an effective approach for intensified heat transfer.
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