application of fluid mechanics Discussion What causes the hydraulic jump to occu

Question

application of fluid mechanics Discussion What causes the hydraulic jump to occur in the horizontal channel and what factors determine the precise location of the jump? 1. Present and discuss reasons for agreement, or lack thereof, between the theoretical results and those obtained experimentally. 2. From your observations of the hydraulic jump for a range of Froude numbers, particularly the downstream profile, compare your observations of the flows with those described above by Round and Garg (1986). 3. 4. Is the mechanical energy E greater before or after the jump? Is the total energy (including all forms) conserved in a hydraulic jump? If so, what happens to the lost mechanical energy

Explanation / Answer

(1) When the flow reaches from super-critical flow to sub-critical flow in horizontal channel hydraulic jump occurs.

Factors affecting the hydraulic jump are channel width, discharge, velocity of flow and Froude number.

(2) We know that Froude No. = ( Inertia / Gravity )0.5

When considering model and prototype in hydraulic jump scenario the scale ratio is kept in mind to get the maximum similarity between the both.

But in theory we consider the value of gravity as a fixed value, but in reality it may differ according to the places.

(3) The Froude No. can be calculated using below equation

  Froude No. = ( Inertia / Gravity )0.5

(4) Mechanical energy E is greater before the hydraulic jump.

Yes the total energy is conserved in a hydraulic jump.

The lost mechanical energy is converted to turbulance, heat or other forms, so one can make use of it in aeration process or any chemical mixing etc,.

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