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Related Concept Videos

Application of Pascal's Law01:03

Application of Pascal's Law

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Pascal's experimentally proven observations—that a change in pressure applied to an enclosed fluid is transmitted undiminished throughout the fluid and to the walls of its container—provide the foundations for hydraulics, one of the most important developments in modern mechanical technology.
Hydraulic systems are used to operate automotive brakes, hydraulic jacks, and numerous other mechanical systems. We can derive a relationship between the forces in a simple hydraulic system...
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Fluid Pressure01:14

Fluid Pressure

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In mechanical engineering, fluid pressure plays a critical role in designing systems that utilize liquid flow, such as hydraulic systems, pumps, and valves. When designing these systems, engineers must ensure they can withstand the forces created by fluid pressure to avoid damage or failure.
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Fluid Pressure over Flat Plate of Constant Width01:05

Fluid Pressure over Flat Plate of Constant Width

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When a body is submerged in water, it experiences fluid pressure acting normal on its surface and distributed over its area. For better design structures, it is crucial to determine the magnitude and location of the resultant force acting on the surface. In the case of a rectangular plate of constant width submerged in water, the pressure increases with depth, resulting in a linearly varying trapezoidal pressure distribution from the upper to the lower edge of the plate.
The resultant force...
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Hydrostatic Pressure Force on a Plane Surface01:04

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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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Hydrostatic Pressure Force on a Curved Surface01:04

Hydrostatic Pressure Force on a Curved Surface

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Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
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Applications of Integration to Find Hydrostatic Pressure01:30

Applications of Integration to Find Hydrostatic Pressure

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Hydrostatic force is a fluid's total force at rest on a surface. For a horizontal surface submerged at a fixed depth, the pressure is constant and calculated as the product of fluid density, gravitational acceleration, and depth. In the case of a vertical dam wall submerged in water, this force is not evenly distributed due to the increasing pressure with depth. This variation arises from the cumulative weight of the water above each point. Integration is used to account for the continuous...
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Pulsed hydraulic-pressure-responsive self-cleaning membrane.

Yang Zhao1, Yuna Gu1, Bin Liu1

  • 1State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, China.

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|August 3, 2022
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Summary
This summary is machine-generated.

A novel hydraulic-pressure-responsive membrane (PiezoMem) generates electrical pulses from pressure fluctuations for in situ self-cleaning. This technology effectively degrades and repels various foulants without chemicals, offering a sustainable solution for membrane applications.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Pressure-driven membranes are crucial separation technologies across industries.
  • Membrane fouling remains a significant challenge, increasing operational costs and reducing efficiency.
  • Current solutions often involve chemical treatments or external stimuli, leading to secondary waste and higher expenses.

Purpose of the Study:

  • To develop a self-cleaning membrane system that addresses the challenge of membrane fouling.
  • To introduce a hydraulic-pressure-responsive membrane (PiezoMem) capable of in situ cleaning.
  • To demonstrate the efficacy of PiezoMem in foulant degradation and repulsion without external agents.

Main Methods:

  • Fabrication of a hydraulic-pressure-responsive membrane (PiezoMem).
  • Applying transient hydraulic pressure fluctuations to induce electroactive responses.
  • Evaluating the membrane's performance against various foulants, including organic molecules, oil, proteins, bacteria, and inorganic colloids.

Main Results:

  • PiezoMem successfully transformed pressure pulses into significant current and voltage oscillations (+5.0/-3.2 V).
  • The generated electrical responses effectively degraded and repelled a broad spectrum of membrane foulants.
  • Antifouling action was attributed to reactive oxygen species (ROS) production and dielectrophoretic repulsion.

Conclusions:

  • PiezoMem offers an innovative, self-cleaning solution for pressure-driven membrane systems.
  • The technology eliminates the need for chemical cleaning agents, reducing environmental impact and operational costs.
  • PiezoMem demonstrates broad applicability in mitigating fouling across diverse industrial separation processes.