Homework Help: HGL and EGL at gradual contract region

1. The problem statement, all variables and given/known data
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 ?
2. Relevant equations


3. The attempt at a solution

 

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 ?.

 

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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