8. pelimpah (weir).ppt
TRANSCRIPT
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PELIMPAH (WEIR)
Ali MasduqiHidrolika
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Fungsi Weir
Dalam bidang teknik lingkungan, weir banyak digunakan :pada terjunan airpada outlet pada bak sedimentasisebagai alat ukur debit
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Bentuk PenampangSegi empat(rectangular weir)
Segi tiga(triangular weir)
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Weir Segi Empat
Q = V.AV = Cd √(2 g h)dA = b . dh
dQ = Cd √(2 g h) . b . dh∫dQ = Cd b√(2 g) . ∫ h1/2 dhQ = 2/3 . Cd √(2 g) .b. h3/2
h
b
23
23
..
: ,2.3
2
..2.3
2
hbcQ
makacgCbila
hbgCQ
d
d
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Nilai Cd pada weir segi empatBentuk Ambang (tampak samping) Nilai Cd
Kepala lebar ambang tajam 0,49 – 0,51
Kepala lebar ambang tumpul 0,50 – 0,55
Ambang dihaluskan sempurna
0,65 – 0,73
Ambang tumpul, satu sisi miring
0,73 – 0,75
Bentuk atap, dihaluskan 0,75 – 0,79
Ambang tipis/tajam 0,64
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Weir Segi Tiga (V-notch)
Q = V.AV = Cd √(2 g x)dA = b/h . (h – x) . dx
dQ = Cd √(2 g x) . b/h . (h – x) . dx∫dQ = Cd b√(2 g) . b/h . ∫ (h-x). x1/2 dxQ = 8/15 . Cd √(2 g) . h5/2 . tan (θ/2 )
)2
1tan(..2.
15
8 25
hgCQ d
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V-notch 90o (Thomson)
25
.2.15
8hgCQ d
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Proportional Weir
)3.(..2..
'arctan
21
aHagbCQ
a
z
b
x
d
H
a
z’
b
x
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Diffuser wall
settler
pelimpah
d
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