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Application of Pascal's Law01:03

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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

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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

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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.
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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 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

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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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Membrana de limpieza automática impulsada que responde a la presión hidráulica

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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Resumen

Una nueva membrana hidráulica sensible a la presión (PiezoMem) genera pulsos eléctricos a partir de las fluctuaciones de presión para la autolimpieza in situ. Esta tecnología degrada y repele efectivamente varios contaminantes sin productos químicos, ofreciendo una solución sostenible para aplicaciones de membrana.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Ingeniería Química
  • Ciencias del medio ambiente

Sus antecedentes:

  • Las membranas impulsadas por presión son tecnologías de separación cruciales en todas las industrias.
  • El ensuciamiento de la membrana sigue siendo un desafío importante, que aumenta los costos operativos y reduce la eficiencia.
  • Las soluciones actuales a menudo implican tratamientos químicos o estímulos externos, lo que lleva a desperdicios secundarios y mayores gastos.

Objetivo del estudio:

  • Desarrollar un sistema de membrana autolimpiante que aborde el desafío de la contaminación de la membrana.
  • Introducir una membrana hidráulica sensible a la presión (PiezoMem) con capacidad de limpieza in situ.
  • Demostrar la eficacia de PiezoMem en la degradación y repulsión de los foulantes sin agentes externos.

Principales métodos:

  • Fabricación de una membrana hidráulica sensible a la presión (PiezoMem).
  • Aplicación de fluctuaciones transitorias de la presión hidráulica para inducir respuestas electroactivas.
  • Evaluar el rendimiento de la membrana contra varios contaminantes, incluyendo moléculas orgánicas, aceite, proteínas, bacterias y coloides inorgánicos.

Principales resultados:

  • PiezoMem transformó con éxito los pulsos de presión en oscilaciones significativas de corriente y voltaje (+5.0/-3.2 V).
  • Las respuestas eléctricas generadas efectivamente degradaron y rechazaron un amplio espectro de impurezas de membrana.
  • La acción antiincrustante se atribuyó a la producción de especies reactivas de oxígeno (ROS) y a la repulsión dielectroforética.

Conclusiones:

  • PiezoMem ofrece una solución innovadora de limpieza automática para sistemas de membrana accionados por presión.
  • La tecnología elimina la necesidad de agentes de limpieza químicos, reduciendo el impacto ambiental y los costos operativos.
  • PiezoMem demuestra una amplia aplicabilidad para mitigar el ensuciamiento en diversos procesos de separación industrial.