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Pressure of Fluids01:14

Pressure of Fluids

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There are many examples of pressure in fluids in everyday life, such as in relation to blood (high or low blood pressure) and in relation to weather (high- and low-pressure weather systems). A given force can have a significantly different effect, depending on the area over which the force is exerted. For instance, a force applied to an area of 1 mm2 has a pressure that is 100 times greater than the same force applied to an area of 1 cm2. That's why a sharp needle is able to poke through...
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Vapor Pressure of Fluid01:28

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The vapor pressure of a fluid is a crucial concept in fluid mechanics, influencing phenomena such as boiling and cavitation. Vapor pressure refers to the pressure exerted by a vapor at a state of thermodynamic equilibrium with its corresponding liquid phase at a specific temperature. It represents the tendency of molecules to escape from the fluid surface into the vapor phase.
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Constant Pressure Calorimetry03:02

Constant Pressure Calorimetry

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Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
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When a plane surface is submerged in a fluid, hydrostatic forces develop on the surface due to the fluid's pressure. For horizontal surfaces, the pressure exerted by the fluid is uniform because the depth remains constant. The resultant force is determined by the pressure at the given depth multiplied by the area of the surface, and it acts through the centroid of the surface. For vertical surfaces, the pressure varies with depth, increasing as the distance from the fluid's free surface...
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Pressure Variation in a Fluid at Rest01:11

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In a fluid at rest, the pressure at any point beneath the fluid surface depends solely on the depth, not on the container's shape or size. This principle, known as hydrostatic pressure, arises because, in stationary fluids, there is no acceleration, meaning the forces within the fluid balance out. Only vertical forces, caused by the weight of the fluid above, contribute to pressure changes with depth.
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Vapor Pressure Lowering03:28

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The equilibrium vapor pressure of a liquid is the pressure exerted by its gaseous phase when vaporization and condensation are occurring at equal rates:
 
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Cryogenic helium subsurface pressurization in terrestrial and low-gravity: experiments and flow visualization.

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Helium subsurface pressurization (HSP) in cryogenic tanks involves injecting helium gas into liquid propellants. This study presents new data on HSP in liquid nitrogen, revealing gravity

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Area of Science:

  • Cryogenic fluid management
  • Thermodynamics
  • Aerospace engineering

Background:

  • Pressurization of cryogenic propellant tanks is crucial for conditioning and transfer.
  • Helium subsurface pressurization (HSP) involves injecting helium gas into liquid propellants.
  • HSP in microgravity presents unknowns regarding evaporation, bubble dynamics, and pressurization rates.

Purpose of the Study:

  • To present new experimental data and flow visualization of subsurface gaseous helium injection into liquid nitrogen.
  • To investigate the effects of varied injector sizes, flow rates, and temperatures.
  • To analyze the influence of gravity, buoyancy, and inertial forces on cryogenic subsurface parameters.

Main Methods:

  • Experimental investigation of helium subsurface injection into liquid nitrogen.
  • Utilized terrestrial gravity and low-gravity conditions.
  • Varied injector sizes (0.25, 1.0 mm), injection flow rates (10^-9–10^-5 kg/s), and helium temperatures (170–260 K).
  • Flow visualization techniques were employed.

Main Results:

  • New experimental data and flow visualization of HSP in liquid nitrogen were obtained.
  • Demonstrated the significant role of gravity, buoyancy, and inertial forces.
  • Quantified rates of evaporation, helium temperature change, bubble growth, and boil-off/pressurization.

Conclusions:

  • Experimental data provides critical insights into HSP phenomena in cryogenic propellants.
  • Gravity, buoyancy, and inertial forces are key factors influencing HSP dynamics.
  • The findings are essential for designing and optimizing cryogenic propellant management systems in space.