Dynamic Pressure Enhancement upon Disk Impact on a Boiling Liquid.

Area of Science:

• Fluid Dynamics
• Thermodynamics
• Phase Transitions

Background:

• Understanding liquid-vapor interactions is critical for industrial safety.
• Previous models often assume non-condensable environments, limiting applicability to boiling systems.

Purpose of the Study:

• To experimentally investigate the impact dynamics of a solid disk on a boiling liquid.
• To analyze the high impact pressures and vapor pocket behavior.
• To elucidate the underlying physical mechanisms, particularly condensation effects.

Main Methods:

• Experimental setup involving a flat, horizontal disk impacting a boiling liquid.
• High-speed visualization and pressure measurements.
• Analysis of vapor pocket dynamics and collapse.

Main Results:

• Observed exceptionally high impact pressures, deviating from inertial scaling.
• Coincident rapid collapse of the entrapped vapor pocket.
• Evidence of significant vapor condensation driving the pocket contraction.

Conclusions:

• Vapor condensation is the primary mechanism for accelerated vapor pocket contraction during high-velocity impacts.
• Findings provide critical insights into the safe handling and transportation of cryogenic fuels.
• The study highlights the limitations of models neglecting condensation in boiling systems.