TJ530 : Experimental Investigation of Liquid Drop Impact on Solid Surface with Thermal Effects
Thesis > Central Library of Shahrood University > Mechanical Engineering > MSc > 2018
Authors:
Sahar Arshtabar [Author], Mohsen Nazari[Supervisor], Mohammad Mohsen Shahmardan[Supervisor]
Abstarct: Drop impact with a solid surface is a phenomenon that occurs in nature. It has many industrial applications in the fields of modern engineering. In the present study, an experimental study is performed to analyze the behavour of water impact on the copper surface by considering the thermal effects. The effects of effective parameters such as the surface type, the height of release, the impact velocity and the surface temperature on the droplet behavior during the spreading and receding are studied. The non-dimensional contact diameter, heat flux, the total thermal energy absorbed from the droplet and cooling effectiveness are also calculated. Water droplets at impact velocity of 0.352, 0.761, 1.272, 1.459 and 1.609 m/s are studied on the copper surface at different temperatures of 〖35.1〗^° C, 〖44.9〗^° C, 〖55.2〗^° C, 〖65〗^° C, and 〖79.8〗^°C. The experimental study shows that increasing of the Weber number leads to an increase in the non- dimensional contact diameters. In this condition, the time to reach the maximum spreading diameter is decreased. Also, the heat flux is decreased with time and the related maximum value is observed at the early stage of droplet impact. The heat flux is also by increasing the initial surface temperature. It is also observed that for constant Weber number, by increasing the surface temperature, the maximum spreading diameter is increased. However, the maximum recoil diameter is decreased which is due to decrease in the liquid viscosity.
Keywords:
#Drop impact #solid surface #impact velocity #surface temperature Link
Keeping place: Central Library of Shahrood University
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