Loss of head at submerged discharge

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Homework Help Overview

The discussion revolves around the concept of fluid dynamics, specifically focusing on the loss of head at submerged discharge. Participants are examining the implications of velocity in a tank and its relation to the velocity in a pipe.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning the meaning of "negligible velocity" as stated by the author, particularly whether it refers to the water velocity in the tank or the pipe. There is also inquiry into the reasoning behind the water becoming 'stilled' and how viscosity affects this process.

Discussion Status

The discussion is active, with participants seeking clarification on the author's statements and exploring the physical principles involved. Some guidance has been provided regarding the interpretation of velocity in the context of the problem.

Contextual Notes

Participants are navigating assumptions about fluid behavior, particularly regarding the mixing of inflowing water with the water in the tank and the effects of viscosity on momentum sharing.

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Homework Statement


in the notes , author said that the velocity within it is negligible? does the author mean the water velocity in the tank ?
so the velocity (v^2)/2g in the 4.24 means the velocity in the pipe ?

Homework Equations

The Attempt at a Solution

 

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foo9008 said:
in the notes , author said that the velocity within it is negligible? does the author mean the water velocity in the tank ?
so the velocity (v^2)/2g in the 4.24 means the velocity in the pipe ?
Yes, the author means that the inflowing water effectively becomes stilled by the water in the tank.
And yes, as the diagram shows, v is the inlet velocity.
 
haruspex said:
Yes, the author means that the inflowing water effectively becomes stilled by the water in the tank.
And yes, as the diagram shows, v is the inlet velocity.
why the water will become ' stilled' ?
 
foo9008 said:
why the water will become ' stilled' ?
Water has some viscosity. It becomes mixed with the water in the tank, sharing its momentum.
 
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