HGL and EGL at gradual contract region

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Homework Help Overview

The discussion revolves around the graphical representation of Hydraulic Grade Line (HGL) and Energy Grade Line (EGL) in the context of fluid dynamics, specifically at a gradual contraction region. Participants are comparing different graphical shapes presented in two images and questioning which representation accurately reflects the behavior of HGL and EGL.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants are attempting to determine the correctness of two different graphical representations of HGL and EGL. They are questioning the significance of the shapes and gradients shown in the images, with some suggesting that the exact shape may not be critical as long as certain trends, like EGL drop and velocity increase, are observed.

Discussion Status

The discussion is ongoing, with participants actively seeking clarification on which graphical representation is correct. There is no explicit consensus yet, and multiple interpretations of the graphs are being explored. Some guidance is being offered regarding the potential irrelevance of the exact shapes if certain conditions are met.

Contextual Notes

Participants are working with limited information, primarily focusing on the visual differences in the graphs without additional context or data to support their claims. The nature of the homework may impose constraints on how these concepts are to be interpreted.

foo9008
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Homework Statement


in the two notes , the shape of graph at the gradual contraction region is are different , which is correct ? the first one ? or the second one ?
in the first picture , we can see that the gradient of graph of HGL is increasing downwards , whereas in the second photo , the gradient of HGL is decreasing downwards? in the second picture , the shape of EGL at gradual contaction region is also different with the first one ? which is correct ?

Homework Equations

The Attempt at a Solution

 

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anyone can comment which one is correct ?
 
i have another example here , in this example we can see that the shape of HGL at nozzle is different with the one in 176 , so which shape is correct ?.
 

Attachments

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or the shape of graph is not important here ? as long as the EGL drop and velocity increse , both graph are correct ?
 
anyone know to answer ?
 
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