Effect of vibration of the condensation plate on the heat transfer during the dropwise condensation on a hybrid hydrophilic-hydrophobic plate using electrostatic spray

Abstract

ABSTRACT This research addressed the effect of dynamic stimulation and vibration at different frequencies on the heat transfer in a condensation substrate coated by Danphobix commercial coating containing aluminum particles while using deionized water as functioning fluid. The required vibrations were generated by a DC motor and measured by evaluating the rate of the DC vibration motor using a laser tachometer. Data collection was conducted in each frequency for different temperature differences. After the calculations, the heat transfer coefficient (HTC) and the heat flux were determined for each frequency and a definite temperature difference. A comparison of the results indicated an improvement in the condensation heat transfer coefficient and heat flux of these coatings under various frequencies. Such an improvement reached 22.3% around 120 Hz (compared to the vibration-free case) by increasing the vibration frequency for a fixed motor, followed by a decline. Potential applications of this research’s outcome can be in improving the performance of heat exchangers.