Friction loss due to exit pipe to reservoir

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Homework Help Overview

The discussion revolves around the concept of head loss in fluid dynamics, specifically focusing on the coefficient k when water is discharged from a pipe into a reservoir versus the atmosphere. Participants are exploring the implications of these scenarios on head loss calculations.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning whether the coefficient k remains equal to 1 when water is discharged into the atmosphere, as opposed to a reservoir. There is an exploration of the conditions under which k might differ, particularly concerning flow characteristics at the exit point.

Discussion Status

The discussion is ongoing, with some participants expressing confidence that k should remain 1 in both scenarios. However, there are questions about the clarity of previous answers, indicating a need for further exploration of the topic.

Contextual Notes

There is a language barrier noted by one participant, which may affect the clarity of communication and understanding within the discussion.

foo9008
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Homework Statement


we know that the formula of head loss is k(V^2) /2g , the k = 1 when the water is discharged from pipe to reservoir ...However , how if the water from pipe is released into atmosphere ? is it necessary to include the head loss due to exit ? if so , is the k still =1 ? in the example , the author take k=1 when water is released to atmosphere from pipe , is he correct ?

Homework Equations

The Attempt at a Solution

 

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foo9008 said:
No, can you try to answer and reply?
Greg's post is automated. It just bumps your thread back up to somewhere it is more likely to get noticed. He will not have seen your reply.
I see no reason why k should be anything but 1 here. k not equal to 1 represents losses caused by messy flows at the junction. On egress to a wide reservoir or to atmosphere, there is no reason to suppose any eddy currents.
 
haruspex said:
Greg's post is automated. It just bumps your thread back up to somewhere it is more likely to get noticed. He will not have seen your reply.
I see no reason why k should be anything but 1 here. k not equal to 1 represents losses caused by messy flows at the junction. On egress to a wide reservoir or to atmosphere, there is no reason to suppose any eddy currents.
Is the head loss due to water discahrged from pipe to reservoir same as head loss due to water discharged from pipe to atmosphere? The k is 1?
 
foo9008 said:
Is the head loss due to water discahrged from pipe to reservoir same as head loss due to water discharged from pipe to atmosphere? The k is 1?
I thought I just answered that. What in my answer did you not understand?
 
haruspex said:
I thought I just answered that. What in my answer did you not understand?
I am not native emglish speaker... Just to be sure, the k is. 1 when water discharged from pipe to atmosphere??
 
foo9008 said:
I am not native emglish speaker... Just to be sure, the k is. 1 when water discharged from pipe to atmosphere??
Yes.
 
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