A molecular dynamics simulation of the abrupt changes in the thermodynamic properties of water after formation of nano-bubbles / nano-cavities induced by passage of charged particles
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866910803856195584 |
|---|---|
| author | Abolfath, Ramin Afshordi, Niayesh Rahvar, Sohrab van Duin, Adri Radler, Martin Taleei, Reza Parodi, Katia Lascaud, Julie Mohan, Radhe |
| author_facet | Abolfath, Ramin Afshordi, Niayesh Rahvar, Sohrab van Duin, Adri Radler, Martin Taleei, Reza Parodi, Katia Lascaud, Julie Mohan, Radhe |
| contents | We present a multi-scale formalism that accounts for the formation of nano-scale bubbles/cavities owing to a burst of water molecules after the passage of high energy charged particles that leads to the formation of hot non-ionizing excitations or thermal spikes (TS). We demonstrate the coexistence of a rapidly growing condensed state of water and a hot spot that forms a stable state of diluted water at high temperatures and pressures, possibly at a supercritical phase. Depending on the temperature of TS, the thin shell of a highly dense state of water grows by three to five times the speed of sound in water, forming a thin layer of shock wave (SW) buffer, wrapping around the nano-scale cylindrical symmetric cavity. The stability of the cavity, as a result of the incompressibility of water at ambient conditions and the surface tension, allows the transition of supersonic SW to a subsonic contact discontinuity and dissipation to thermo-acoustic sound waves. We further study the mergers of nanobubbles that lead to fountain-like or jet-flow structures at the collision interface. We introduce a time delay in the nucleation of nano-bubbles, a novel mechanism, responsible for the growth and stability of much larger or even micro-bubbles, possibly relevant to FLASH ultra-high dose rate (UHDR). The current study is potentially significant at FLASH-UHDRs. Our analysis predicts the black-body radiation from the transient supercritical state of water localized in nano-cavities wrapping around the track of charged particles can be manifested in the (indirect) water luminescence spectrum. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_05880 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A molecular dynamics simulation of the abrupt changes in the thermodynamic properties of water after formation of nano-bubbles / nano-cavities induced by passage of charged particles Abolfath, Ramin Afshordi, Niayesh Rahvar, Sohrab van Duin, Adri Radler, Martin Taleei, Reza Parodi, Katia Lascaud, Julie Mohan, Radhe Medical Physics Biological Physics Chemical Physics Computational Physics Fluid Dynamics We present a multi-scale formalism that accounts for the formation of nano-scale bubbles/cavities owing to a burst of water molecules after the passage of high energy charged particles that leads to the formation of hot non-ionizing excitations or thermal spikes (TS). We demonstrate the coexistence of a rapidly growing condensed state of water and a hot spot that forms a stable state of diluted water at high temperatures and pressures, possibly at a supercritical phase. Depending on the temperature of TS, the thin shell of a highly dense state of water grows by three to five times the speed of sound in water, forming a thin layer of shock wave (SW) buffer, wrapping around the nano-scale cylindrical symmetric cavity. The stability of the cavity, as a result of the incompressibility of water at ambient conditions and the surface tension, allows the transition of supersonic SW to a subsonic contact discontinuity and dissipation to thermo-acoustic sound waves. We further study the mergers of nanobubbles that lead to fountain-like or jet-flow structures at the collision interface. We introduce a time delay in the nucleation of nano-bubbles, a novel mechanism, responsible for the growth and stability of much larger or even micro-bubbles, possibly relevant to FLASH ultra-high dose rate (UHDR). The current study is potentially significant at FLASH-UHDRs. Our analysis predicts the black-body radiation from the transient supercritical state of water localized in nano-cavities wrapping around the track of charged particles can be manifested in the (indirect) water luminescence spectrum. |
| title | A molecular dynamics simulation of the abrupt changes in the thermodynamic properties of water after formation of nano-bubbles / nano-cavities induced by passage of charged particles |
| topic | Medical Physics Biological Physics Chemical Physics Computational Physics Fluid Dynamics |
| url | https://arxiv.org/abs/2403.05880 |