Holding water in a sieve-stable droplets without surface tension

Area of Science:

• Thermodynamics
• Fluid Dynamics
• Materials Science

Background:

• Supercritical fluids were traditionally considered structureless, but recent findings show distinct liquid and gaseous states.
• A higher-order phase transition, pseudo-boiling, occurs between these states across the Widom line.
• Previously, observed interfaces and droplets in supercritical mixtures were attributed to surface tension.

Purpose of the Study:

• To introduce and explain a novel physical mechanism for interface formation in supercritical fluids.
• To challenge the conventional understanding of droplets and phase interfaces.
• To explore the potential applications of this new phenomenon in engineering.

Main Methods:

• Theoretical analysis based on first principles.
• Computational simulations of fluid behavior under supercritical conditions.

Main Results:

• Stable droplets, bubbles, and planar interfaces can form in supercritical fluids without surface tension.
• This phenomenon is driven by thermal gradient induced interfaces (TGIIF).
• TGIIF demonstrates unexpected behaviors of supercritical fluids, distinct from gases or liquids.

Conclusions:

• Supercritical fluids exhibit complex interfacial phenomena beyond traditional surface tension models.
• TGIIF offers a new perspective on phase behavior and interface formation in supercritical systems.
• This discovery has potential applications in optimizing fuel injection and heat transfer in high-pressure systems.