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++ Basic equation of Energy : E = y+V2/2g (y - Datum head ; v2/2g - velocity head : Pressure head = 0 as only atmospheric pressure is acting) E = y + Q2/2*A2g (V= Q/A) E = y + Q2/2*A2g (E is whole function of y i.e Area is also function y) for Specific Energy to be minimum Variation of E w.r.t y should be zero dE/dy should be zero. Q2T/A3g = 1 (T= Top width of section) condition for general section Froude Number = (V2/(gD)^1/2) (V= velocity of flow ; g= accln due to gravity; D= Hydraulic Depth i.e D=A/T) Emin is min specific energy at Yc if EEmin then Y>Yc then Froude number < 1 i.e. flow is subcritical (For Rectangular Section) : (q2/g)^1/3 = Yc (q=Q/B) (T=B for rectangular section) Vc= (gYc)^1/2 Emin = 1.5 Yc (For Triangular Section) : (2Q2/m2g)^1/5 = Yc (T= 2my) (m= cross slope of triangular section) Vc = (gYc/2)^1/2 Emin = 1.25 Yc Hope i have explained the lecture in bandy manner if something is wrong please correct me. Thank You
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++ Basic equation of Energy :
E = y+V2/2g (y - Datum head ; v2/2g - velocity head : Pressure head = 0 as only atmospheric pressure is acting)
E = y + Q2/2*A2g (V= Q/A)
E = y + Q2/2*A2g (E is whole function of y i.e Area is also function y)
for Specific Energy to be minimum Variation of E w.r.t y should be zero dE/dy should be zero.
Q2T/A3g = 1 (T= Top width of section) condition for general section
Froude Number = (V2/(gD)^1/2) (V= velocity of flow ; g= accln due to gravity; D= Hydraulic Depth i.e D=A/T)
Emin is min specific energy at Yc if
EEmin then Y>Yc then Froude number < 1 i.e. flow is subcritical
(For Rectangular Section) :
(q2/g)^1/3 = Yc (q=Q/B) (T=B for rectangular section)
Vc= (gYc)^1/2
Emin = 1.5 Yc
(For Triangular Section) :
(2Q2/m2g)^1/5 = Yc (T= 2my) (m= cross slope of triangular section)
Vc = (gYc/2)^1/2
Emin = 1.25 Yc
Hope i have explained the lecture in bandy manner if something is wrong please correct me.
Thank You
Nicely compiled .
1:42 Specific Energy Equation
6:27 Specific Energy Curve
10:49 Question -1
12:38 Critical Flow
27:15 Question-2
30:19 Critical Flow in Rectangular Channel
36:49 Question -3
40:00 Question -4
42:09 Critical Flow in Triangular Channel
47:40 Question-5 and 6
50:46 Question -7
53:23 Question -8
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Really excellent explaination sir 😍
Thank you sir