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Experimental investigation on flow boiling bubble motion under ultrasonic field in vertical minichannel by using
1School of Intelligent Manufacturing, Dongguan University of Technology-City College, Guangdong 523419, China.
Ultrasonics Sonochemistry
|March 16, 2023
Summary
Ultrasound significantly enhances bubble detachment frequency, velocity, and travel distance in minichannel flow boiling. This study investigates bubble dynamics under ultrasonic fields, revealing complex behaviors and increased kinetic energy with higher frequencies.
Area of Science:
- Multiphase flow
- Heat transfer
- Acoustic cavitation
Background:
- Bubble dynamics are crucial in minichannel flow boiling.
- The impact of ultrasonic fields on bubble behavior in minichannels is under-researched.
- Understanding these effects is vital for optimizing heat transfer processes.
Purpose of the Study:
- To experimentally investigate the effects of ultrasonic fields on bubble dynamics during flow boiling in minichannels.
- To analyze bubble growth, trajectories, velocities, and travel distances under varying ultrasonic frequencies (23, 28, 32, and 40 kHz).
- To quantitatively explore the underlying mechanisms using numerical simulations.
Main Methods:
- Experimental study capturing bubble motion in minichannel flow boiling.
- Development of a bubble tracking algorithm to analyze bubble growth, trajectories, velocities, and travel distances.
- Numerical simulations to quantitatively investigate bubble motion mechanisms under ultrasonic fields.
Main Results:
- Application of ultrasound significantly increased bubble detachment frequency, velocity, and travel distance.
- Observed complex bubble growth behaviors and trajectories, leading to unstable two-phase gas-liquid flow.
- Bubble kinetic energy increased with rising ultrasound frequency.
Conclusions:
- Ultrasonic fields profoundly influence bubble dynamics in minichannel flow boiling.
- The study provides a qualitative and quantitative understanding of ultrasound-induced bubble motion.
- Findings suggest potential for enhanced heat transfer and process control using ultrasonic fields.
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