The Effect of Ultrasonic Vibration Frequency on Double Pipe Heat Exchangers During the Cooling Process
Bambang Sugiyono Purwono (State Polytechnics of Malang, Indonesia); Bambang Irawan (State Polytechnic of Malang, Indonesia)
We investigate the effect of ultrasonic vibrations on heat transfer of 1000 mm long double pipe heat exchangers in parallel flow configuration during experimental cooling processes. The PVC inner diameter of the heat exchanger utilizes a 4 mm brass, 0.75 mm thickness, and a 32.5 mm for the outer diameter and 2.75 mm thickness. The ultrasound is applied and controlled in the range of 20, 30 and 40 kHz frequencies and power of 35 W. Both radiator-coolant and the Aquades cleaning fluid flow in the inner tube, while the cold fluid (tap water) flows in the outer tube. By investigating the overall heat transfer coefficient with and without the influence of ultrasound vibrations, this study has found that the faster the fluid flow rate the higher the overall heat transfer coefficient. The higher overall heat transfer coefficient enhancement was about 44% and 31% with ultrasonic vibration for radiator-coolant and Aquades fluids respectively at a frequency of 20 kHz.
Journal: International Journal of Simulation- Systems, Science and Technology- IJSSST V20
Published: Feb 28, 2019