Laser-Enhanced Bubble Detachment Velocity and Heat Dissipation on Abrasive Surfaces

Area of Science:

• Heat Transfer
• Fluid Dynamics
• Optics

Background:

• Bubble detachment is key to boiling heat transfer efficiency.
• Light-regulation technology offers precise, remote control for bubble detachment.
• Research on bubble detachment velocity and millimeter-scale bubbles is limited.

Purpose of the Study:

• To systematically investigate light-regulated detachment velocity of millimeter-scale bubbles.
• To explore the effects of laser power density and surface roughness on bubble detachment.
• To confirm the impact of enhanced bubble detachment on heat transfer efficiency.

Main Methods:

• Utilized light-regulation technology to control bubble detachment.
• Varied laser power density and surface roughness.
• Conducted comparative heat transfer experiments.

Main Results:

• Bubble detachment velocity shows a non-monotonic relationship with laser power density.
• Reduced surface roughness enhances bubble detachment velocity.
• Optimized conditions yielded average and maximum velocities of 49.03 and 51.31 mm/s.
• Laser-induced bubble detachment improved heat transfer efficiency.

Conclusions:

• Light-regulation technology effectively controls millimeter-scale bubble detachment velocity.
• Optimized parameters significantly enhance bubble detachment and heat transfer.
• Findings have implications for microscale heat conduction, hydrogen production, and chemical flotation.