The demonstration of a hydraulic jump in rectangular open channel part- 2 !! Fluid mechanics -2


What is the hydraulic jump and its use? Industrial. The hydraulic jump is the most commonly used choice of design engineers for energy dissipation below spillways and outlets. A properly designed hydraulic jump can provide for 60-70% energy dissipation of the energy in the basin itself, limiting the damage to structures and the streambed. Types of Hydraulic Jumps – Undular Hydraulic Jump – Weak Jump – Oscillating Hydraulic Jump – Steady Hydraulic Jump – Strong Hydraulic Jump – What does Froude's number mean? The Froude number is a measurement of bulk flow characteristics such as waves, sand bedforms, flow/depth interactions at a cross-section or between boulders. The denominator represents the speed of a small wave on the water surface relative to the speed of the water, called wave celerity. What is the length of a hydraulic jump? In civil engineering, the hydraulic jump is used to dissipate stream energy. It is usually, so-called, the submerged hydraulic jump, maintained in the stilling basin downstream the flow control device. ... The length of the hydraulic jump (L0) is measured starting from a cross-section of the first conjugate depth (h1). Why does energy loss occur in hydraulic jumps? About hydraulic jumps The depth of supercritical flow, y1, 'jumps' up to its subcritical conjugate depth, y2, and the result of this abrupt change in flow conditions is considerable turbulence and Energy Loss, EL


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                                                                     Hydraulic jump practical part-1 Loss of Kinetic Energy. The velocity of subcritical flow is less than supercritical flow. The depth of subcritical flow is greater than the depth of supercritical flow. Calculation part For discharge= Q= volume/time Q= A * V Q= b * Y1 * V1 Q= b * Y2 * V2 Fr1 = V/ root ( g*y1) loss of enenrgy= (y2-y1)^3 ------------- 4y1*y2 A hydraulic jump is a phenomenon in the science of hydraulics that is frequently observed in open channel flow such as rivers and spillways. When liquid at high velocity discharges into a zone of lower velocity, a rather abrupt rise occurs in the liquid surface. Types of Hydraulic Jumps – Based on Froude's Number: Undular Hydraulic Jump – Froude Number (1 to 3): ... Weak Jump – Froude Number (3 to 6) ... Oscillating Hydraulic Jump – Froude Number (6-20) ... Ste
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Hydraulic jump explanation

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hydraulic jump A  hydraulic jump  is a phenomenon in the science of  hydraulics  that is frequently observed in open channel flow such as rivers and spillways. When liquid at high velocity discharges into a zone of lower velocity, a rather abrupt rise occurs in the liquid surface. What causes a hydraulic jump? A  hydraulic jump  occurs when the upstream flow is supercritical (F>1). To have a  jump , there must be a flow impediment downstream. The downstream impediment could be a weir, a bridge abutment, a dam, or simply channel friction. Water depth increases during a  hydraulic jump  and energy is dissipated as turbulence. How do you calculate hydraulic jump? How do you calculate hydraulic jump? Equations for  Hydraulic Jump Calculations y2/y1 = (1/2)[-1 + (1 + 8Fr12)1/2] ; V1 = Q/(by1) ; and Fr1 = V1/(y1g)1/2. The upstream velocity, V1 and upstream Froude number, Fr1, need to be  calculated  first, using the last two equations, then the downstream depth of flow, y2 can be  calcula
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