Enhancement of heat transfer in forced convection by using dual low-high frequency ultrasound

Combined sonication with dual-frequency ultrasound has been investigated to enhance heat transfer in forced convection. The test section used for this study consists of a channel with, on one hand, heating blocks normal the water flow, equipped thermocouples, and, other two ultrasonic emitters. One is facing blocks, thus field perpendicular, and second collinear flow. Two types waves were used: low-frequency (25 kHz) generate mainly acoustic cavitation high-frequency (2 MHz) well-known induce Eckart’s streaming. A thermal approach was conducted investigate enhancement presence ultrasound. This completed PIV measurements assess hydrodynamic behavior modifications under Sonochemiluminescence experiments performed account location within results have shown synergetic effect using combined low-and-high-frequency sonication. Enhancement related greater induced turbulence flow by comparison single-frequency However, ultrasonically-induced not homogeneously distributed synergy depends generation along wall. For optimal configuration work, local factor up 366% observed Turbulent Kinetic Energy enhanced 84% when compared silent regime.