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Related Concept Videos

Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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Phase Transitions: Sublimation and Deposition02:33

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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
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Phase Diagram01:24

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A phase diagram is a graphical representation of the physical states of a substance under different conditions of temperature and pressure. It shows the boundaries between solid, liquid, and gas phases and the conditions at which these phases coexist in equilibrium. An area in a phase diagram represents a single phase, whereas lines or phase boundaries represent the equilibrium between two phases.In the phase diagram of water, the boundary line between the solid and liquid states illustrates...
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Two Components: Liquid–Liquid Systems01:27

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A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...
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Distillation: Vapor–Liquid Equilibria01:01

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Distillation is a separation technique that takes advantage of the boiling point properties of disparate elements in a mixture. To perform distillation, we begin by heating a miscible mixture of two liquids with a significant difference in boiling points (at least 20°C). As the solution heats up and reaches the bubble point of the more volatile component, some molecules of the more volatile component transition into the gas phase and travel upward into the condenser, which is a glass tube...
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Pattern Evolution during Double Liquid-Vapor Phase Transitions under Weightlessness.

Ana Oprisan1, Yves Garrabos2,3, Carole Lecoutre4,5

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Phase transitions in fluids were studied in microgravity using sulfur hexafluoride (SF₆). Researchers observed droplet growth dynamics, revealing distinct evolution patterns for liquid droplets and vapor bubbles.

Keywords:
binary coalescencemicrogravityphase separation

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Area of Science:

  • Fluid dynamics
  • Thermodynamics
  • Materials science

Background:

  • Phase transitions in fluids are crucial for industrial applications like heat transfer and extraction.
  • Earth's gravity complicates the study of fundamental phase transition dynamics.
  • Microgravity environments offer a unique opportunity to investigate these phenomena without gravitational interference.

Purpose of the Study:

  • To investigate the dynamics of liquid-vapor phase separation in sulfur hexafluoride (SF₆) under microgravity conditions.
  • To analyze the evolution of droplet and bubble radii distributions during phase separation.
  • To understand the growth mechanisms of droplets and bubbles in the absence of significant gravitational effects.

Main Methods:

  • Direct imaging of phase separation in SF₆ aboard the International Space Station (ISS).
  • Utilizing both full-view and microscopic imaging to capture phase separation dynamics.
  • Analyzing droplet and bubble radii distributions using lognormal functions and time-evolution studies.

Main Results:

  • Radii distributions of separated phases were accurately modeled by a lognormal function.
  • Over time, smaller droplets decreased in number while larger droplets increased.
  • Liquid droplets exhibited a mean radii evolution proportional to t^(1/3), consistent with Brownian coalescence.
  • Vapor bubbles showed a mean radii evolution proportional to t^(1/2), suggesting directional motion influenced by residual gravity or Marangoni forces.

Conclusions:

  • Microgravity experiments provide critical insights into fluid phase transition dynamics.
  • Droplet and bubble growth mechanisms differ, with distinct time evolutions observed.
  • Residual gravitational effects or surface tension gradients may influence bubble dynamics even in microgravity.