Study of acoustic emission due to vaporisation of superheated droplets at higher pressure
| Autor: | Prasanna Kumar Mondal, Rupa Sarkar, Barun K. Chatterjee |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Physics - Instrumentation and Detectors Physics::Instrumentation and Detectors Bubble nucleation FOS: Physical sciences General Physics and Astronomy Thermodynamics Instrumentation and Detectors (physics.ins-det) Mechanics Threshold energy 01 natural sciences Signal 030218 nuclear medicine & medical imaging Physics::Fluid Dynamics Superheating 03 medical and health sciences 0302 clinical medicine Amplitude Acoustic emission 0103 physical sciences Supersonic speed 010306 general physics Ambient pressure |
| Zdroj: | Physics Letters A. 381:2531-2537 |
| ISSN: | 0375-9601 |
| Popis: | The bubble nucleation in superheated liquid can be controlled by adjusting the ambient pressure and temperature. At higher pressure the threshold energy for bubble nucleation increases and we have observed that the amplitude of the acoustic emission during vaporisation of superheated droplet decreases with increase in pressure at any given temperature. Other acoustic parameters such as the primary harmonic frequency and the decay time constant of the acoustic signal also decrease with increase in pressure. It is independent of the type of superheated liquid. The decrease in signal amplitude limits the detection of bubble nucleation at higher pressure. This effect is explained by the microbubble growth dynamics in superheated liquid. Comment: 11 pages, 9 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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