Morphological evolution and spreading flow of hollow oil droplet impact on a heated wall
| Autor: | Wei Wang, De-yu Tu, Qing-min Pan, Jian-hong Zhou, Baohong Tong, Guo-tao Zhang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Fluid Flow and Transfer Processes
Jet (fluid) Materials science Bubble digestive oral and skin physiology Flow (psychology) technology industry and agriculture General Engineering Computational Mechanics Mechanics Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics Surface tension Heat flux Oil droplet 0103 physical sciences Heat transfer Lubrication 010306 general physics |
| Zdroj: | Theoretical and Computational Fluid Dynamics. 35:209-227 |
| ISSN: | 1432-2250 0935-4964 |
| Popis: | A coupled level set and volume–of–fraction method is applied to investigate hollow oil droplet impacts on heated walls. Results show that given the increase in impact velocity, three evolutionary processes of spreading, transition, and central jet occur after the hollow oil droplet impact on a heated wall. The variation in the spreading length of hollow oil droplets is similar in different evolutionary processes, but the variation in the center height of hollow oil droplets is relatively different. The wall heat flux and the position of the maximum heat flux increase with impact velocity. In addition, the wall temperature influences the flow and heat transfer characteristics of the hollow oil droplet impingement. Considering the viscosity–temperature characteristics of the lubricating oil, the spreading length of the hollow oil droplet increases with the wall temperature, but the central height of the hollow oil droplet is unaffected by the wall surface temperature. The wall heat flux and the position of the maximum heat flux also increase with the impact velocity. Pressure and velocity distribution indicate that the bubble rupture at the central jet originates from the combined effect of inertial force and surface tension. The results of this study provide a basis for an improved understanding of the flow and heat transfer characteristics of hollow oil droplet impact on a heated wall and serve as a theoretical reference for investigating the effect of bubbles on oil–gas lubrication processes. |
| Databáze: | OpenAIRE |
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