Hydraulic Principle
Hydraulic Principle - Related Videos
09:15
Hydraulic Jumps
0 Views •
2023
Source: Alexander S Rattner and Mahdi Nabil; Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA When liquid flows along an open channel at high velocity, the flow can become unstable, and slight disturbances can cause the liquid upper surface to transition abruptly to a higher level (Fig. 1a). This sharp increase in the liquid level is called a hydraulic jump. The increase in the liquid level causes a reduction in the average flow velocity.
01:16
Hydraulic Jump: Problem Solving
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2025
To analyze a hydraulic jump in a rectangular channel with a flow speed of 6 meters per second, follow these steps:Calculate Effective Upstream Velocity:When the downstream gate closes, a hydraulic jump forms, traveling upstream at 2 meters per second. This wave speed combines with the initial channel flow velocity, creating an effective upstream velocity.Identify Flow Velocities Before and After the Hydraulic Jump:Upstream of the hydraulic jump, the effective flow velocity includes both the...
01:29
Hydraulic Jump
0 Views •
2025
A hydraulic jump is a sudden rise in fluid depth in open channels, occurring when high-velocity (supercritical) flow transitions to low-velocity (subcritical) flow. This phenomenon requires an upstream Froude number greater than 1, as flows with Fr1<1 remain subcritical, making a hydraulic jump impossible due to the need for negative head loss, which violates thermodynamic principles.The characteristics of a hydraulic jump depend on the upstream Froude number and are classified as...
08:10
Hydraulic Extrusion of the Spinal Cord and Isolation of Dorsal Root Ganglia in Rodents
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Cited by 110 •
2017
Here, we present a protocol for hydraulic extrusion of the spinal cord as well as identification and isolation of specific dorsal root ganglia (DRGs) in the same rodent. Compared to standard spinal cord isolation methods, this method is significantly faster and reduces the risk of tissue damage.
08:37
Le Châtelier's Principle
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2023
Source: Laboratory of Dr. Lynne O'Connell — Boston College When the conditions of a system at equilibrium are altered, the system responds in such a way as to maintain the equilibrium. In 1888, Henri-Lewis Le Châtelier described this phenomenon in a principle that states, "When a change in temperature, pressure, or concentration disturbs a system in chemical equilibrium, the change will be counteracted by an alteration in the equilibrium composition." This experiment demonstrates Le Châtelier's...
FAQs
Pressure is found by dividing force by piston area. When the input force acts on a smaller piston, it establishes pressure in the confined fluid. The same pressure acts on the larger piston, where multiplying that pressure by the larger area produces a greater output force. This area relationship explains the system’s mechanical advantage.
Hydraulic force multiplication is accompanied by a motion tradeoff: the larger piston produces greater force, but it moves a shorter distance than the smaller input piston. This paired behavior matters when evaluating a device, because the principle does not simply increase force without affecting piston movement. It links output force to piston displacement.
A confined, nearly incompressible fluid carries applied pressure from one piston to the other. Confinement keeps the fluid positioned between the pistons, while near incompressibility supports pressure transmission through the system. This behavior makes the fluid essential for transferring an input force to an output piston in hydraulic equipment.
The forces differ because force depends on both pressure and surface area. The pressure transmitted through the fluid can act on each piston, but a larger piston has more area over which that pressure acts. Consequently, it produces a larger force than a smaller piston under the same transmitted pressure.
Begin by identifying the input force and the area of the small piston. Divide force by area to determine the applied pressure, then consider that pressure acting on the larger piston. Multiplying the transmitted pressure by the output piston’s area gives the output force, while the piston sizes also indicate the relative movement.
Hydraulic lifts, brakes, presses, and excavators apply this principle in different mechanical settings. In each case, pressure transmission allows a relatively compact system to transfer force between pistons. The resulting force multiplication supports demanding tasks such as lifting, pressing, braking, or operating excavation equipment.
The principle connects several central physics ideas: fluid pressure, force, piston area, and mechanical advantage. Studying their relationship shows how changing the area over which pressure acts affects output force and piston movement. It therefore provides a practical way to understand how compact hydraulic systems perform tasks requiring substantial mechanical force.