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BAB V
ANALISA DATA, TABEL DAN GRAFIK
A. UNTUK ALIRAN LAMINAR
Analisa data :
Data No. = 3
Q ( debit ) dalam m3/s = 23 liter/m = 4.10-4 = 0,00038 m3/s
Temperatur = 28 ˚C = 273 + 28 = 301 ˚K
Viskositas kinematis = 20 . 10-6
ΔP dalam Pa = ( 0,054 – 0,099 ) .105 = 4100 Pa
ΔL dalam m = ( 3,39 – 0,75 ) m = 2,64 m
ρair berdasarka T = 996,4 kg/m2
ρoli ( SGoli = 0,835 ) = SGoli x ρair = 831,994 kg/m2
1. Kecepatan rata-rata aliran fluida dalam pipa ( V )
V = (m/s)
=
= 1,353 m/s
2. Bilangan Reynolds ( Re )
Re =
=
= 1285,060
3. Faktor Gesek ( fg )
fg =
=
= 0,050
4. Energi Kinetik Aliran fluida ( Ek )
Ek = (j/s) Apipa = π.D2/4
= = = 2,83385.10-
4 m2
= 0,289 J/s m = ρoli. V . Apipa
= 831,994. 1,353. 2,83385.10-4
= 0,319 kg/s
5. Menghitung Tegangan Geser ( σ0 )
σ0 = (N/m2)
=
= 8,097 N/m2
6. Kerugian Gesek ( hf )
hf = m
=
= 0,027 m
7. Kecepatan Aliran Fluida Maksimal ( Vmaks )
Vmaks = 2 . V (m/s)
= 2 . 1,353
= 2,705 m/s
8. Gaya Gesek pada Dinding Pipa
F = m . V (N)
= 0,319 . 1,353
= 0,432 N
9. Menghitung Distribusi Kecepatan ( Urn )
Urn = 2 . V . (m/s)
Ur0 = 2. 1,353 .
= 2. 1,353 .
= 2,705 m/s
Ur1 = 2. 1,353.
= 2. 1,353.
= 2,594 m/s
Ur2 = 2. 1,353.
= 2. 1,353.
= 2,273 m/s
Ur3 = 2. 1,353.
= 2. 1,353.
= 1,731 m/s
Ur4 = 2. 1,353.
= 2. 1,353.
= 0,974 m/s
Ur5 = 2. 1,353.
= 2. 1,353.
= 0 m/s
10. Distribusi Tegangan geser ( σrn )
σrn =
σr0 =
=
= 0 N/m2
σr1 =
=
= 3,239 N/m2
σr2 =
=
= 4,858 N/m2
σr3 =
=
= 4,858 N/m2
σr4 =
=
= 6,477 N/m2
σr5 =
=
= 8,097 N/m2
B. UNTUK ALIRAN TURBULEN
Analisa data :
Data No. = 10
Q ( debit ) dalam m3/s = 44 liter/m = = 7,33.10-4 m3/s
Temperatur = 30 ˚C = 273 + 30 = 303 ˚K
Viskositas kinematis = 17. 10-6 m2/s
ΔP dalam Pa = ( 0,270 – 0,114 ) .105 = 15600 Pa
ΔL dalam m = ( 3,39 – 0,75 ) m = 2,64 m
ρair berdasarka T = 996 kg/m2
ρoli ( SGoli = 0,835 ) = SGoli x ρair = 831,826 kg/m2
1. Kecepatan rata-rata aliran fluida dalam pipa ( V )
V = (m/s)
=
= 2,588 m/s
2. Bilangan Reynolds ( Re )
Re =
=
= 2892,206
3. Faktor Gesek ( fg )
fg =
=
= 0,022
4. Energi Kinetik Aliran fluida ( Ek )
Ek = (j/s) Apipa = π.D2/2
= = =
2,83385.10-4 m2
= 2,042 j/s m = ρoli. V . Apipa
= 831,827. 2,588. 2,83385.10-4
= 0,61 kg/s
5. Menghitung Tegangan Geser ( σ0 )
σ0 = (N/m2)
=
= 31,667 N/m2
6. Kerugian Gesek ( hf )
hf = m
=
= 0,05 m
7. Kecepatan Aliran Fluida Maksimal ( Vmaks )
Vmaks = U*.(2,44) Ln + 1,34 (m/s) U* =
= 0,180143. 2,44. Ln + 1,34 =
= 3,650 m/s = 0,180143
8. Gaya Gesek pada Dinding Pipa
F = m . V (N)
= 0,61 . 2,588
= 1,363 N
9. Menghitung Distribusi Kecepatan ( Urn )
Urn = Vmaks – 5,75 U* . (m/s)
Ur0 = 3,560 – 1,0358
= 3,560 - 0= 3,560 m/s
Ur1 = 3,560. – 1,0358
= 3,560 - 0,12067= 3,539 m/s
Ur2 = 3,560. – 1,0358
= 3,560 - 0,26076 = 3,401 m/s
Ur3 = 3,560. – 1,0358
= 3,71546 - 0,467378 = 3,203 m/s
Ur4 = 3,560. – 1,0358
= 3,560 – 0,8215798 = 2,865 m/s
Ur5 = 3,560. – 1,0358
= 3,71546 - 3,71546 = 0 m/s
10. Distribusi Tegangan geser ( σrn )
σrn =
σr0 =
=
= 0 N/m2
σr1 =
=
= 6,433 N/m2
σr2 =
=
= 12,667 N/m2
σr3 =
=
= 19 N/m2
σr4 =
=
= 25,333 N/m2
σr5 =
=
= 31,667 N/m2
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