Temperature considerations in non-spherical bubble collapse near a rigid wall

9th International Symposium on Cavitation

Beig, Shahaboddin Alahyari^1 ; Johnsen, Eric^1

Mechanical Engineering Department, University of Michigan, Ann Arbor

MI

48109, United States^1

关键词: Bubble collapse;    Cavitation bubble;    Computational approach;    Heat diffusions;    Interface capturing scheme;    Non-dimensional parameters;    Pressure and temperature;    Temperature rise;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012044/pdf
DOI  :  10.1088/1742-6596/656/1/012044

来源: IOP

【 摘 要 】

The inertial collapse of cavitation bubbles is known to be capable of damaging its surroundings. While significant attention has been dedicated to investigating the pressures produced by this process, less is known about heating of the surrounding medium, which may be important when collapse occurs near objects whose mechanical properties strongly depend on temperature (e.g., polymers). Using a newly developed computational approach that prevents pressure and temperature errors generated by naively implemented shock- and interface-capturing schemes, we investigate the dynamics of shock-induced collapse of gas bubbles near rigid surfaces. We characterize the temperature fields based on the relevant nondimensional parameters entering the problem. In particular, we show that bubble collapse causes temperature rises in neighboring solid objects via two mechanisms: the shock produced at collapse and heat diffusion from the hot bubble close to the object.