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HASIL PENGAMATAN DAN PERHITUNGAN
ACARA V
5.1. Hasil Pengamatan
Tabel 5.1. Hasil Pengamatan Aliran Laminar, Transisi, dan Turbulen
Aliran
Volume (m3)
Rata-rata (m3) Re
1 2 3
Laminar 42×10 ̄ 5 m3 41×10 ̄ 5 m3 5×10 ̄ 4 m3 4,4333×10 ̄ 4 m3 1526,8
Transisi 52×10 ̄ 5 m3 54×10 ̄ 5 m3 58×10 ̄ 5 m3 5,4667×10 ̄ 4 m3 2885,5
Turbulen 7×10 ̄ 4 m3 7×10 ̄ 4 m3 75×10 ̄ 5 m3 7,1667×10 ̄ 4 m3 21.250
5.2. Hasil Perhitungan
Diketahui : ρ = 1 Kg/m/s
D = 0,02 m r = 0,01 m
𝐴 = 𝜋𝑟2
= 3,14 x 10-4 m2
𝜇 = 0,804 x 10-6 m2
Ditanya : a. Debit (Q) =........?
b. Kecepatan (v) =........?
c. bilangan Reynold (Re) =........?
Penyelesaian :
1. Aliran Laminar
Diketahui : V rata-rata =443,33 ml ÷1 x 106 = 4,4333×10 ̄ 4 m3
Waktu (t) = 23 sekon
𝑄 =
𝑉𝑜𝑙𝑢𝑚𝑒 𝑟𝑎𝑡𝑎−𝑟𝑎𝑡𝑎
𝑊𝑎𝑘𝑡𝑢
=
4,4333×10 ̄ 4
m3
23 𝑠𝑒𝑘𝑜𝑛
= 0,19275×10 ̄ ⁴ m3/s
𝑣 =
𝑄
𝐴
=
0,19275 ×10 ̄ ⁴ 𝑚³/𝑠
3,14 𝑥 10 ̄ ⁴ 𝑚²
= 0,06138 m/s
Re =
𝑣.𝜌.𝐷
𝜇
=
0,06138 𝑥 1 𝑥 0,02
0,804 𝑥 10−6 =
1,2276 ×10 ̄ ³
0,804 𝑥 10−6
= 1,5268 × 10 ³
= 1526,8
2. Aliran Transisi
Diketahui : V rata-rata = 546,67 ml : 1 x 106 = 5,4667×10 ̄ 4 m3
Waktu (t) = 15 sekon
𝑄 =
𝑉𝑜𝑙𝑢𝑚𝑒 𝑟𝑎𝑡𝑎−𝑟𝑎𝑡𝑎
𝑊𝑎𝑘𝑡𝑢
=
5,4667 𝑥 10−4
𝑚3
15 𝑠𝑒𝑘𝑜𝑛
= 0,3644 𝑥 10−4
m3/s
𝑣 =
𝑄
𝐴
=
0,3644 𝑥 10−4
𝑚³/𝑠
3,14 𝑥 10−4 𝑚²
= 0,1160 m/s
Re =
𝑣.𝜌.𝐷
𝜇
=
0,116 𝑥 1 𝑥 0,02
0,804 𝑥 10−6
= 2885,5
3. Aliran Turbulen
Diketahui : V rata-rata = 716,67 ml : 1 x 106 = 7,1667 × 10 ̄ ⁴
Waktu (t) = 2,67 sekon
𝑄 =
𝑉𝑜𝑙𝑢𝑚𝑒 𝑟𝑎𝑡𝑎−𝑟𝑎𝑡𝑎
𝑊𝑎𝑘𝑡𝑢
=
7,1667 𝑥 10−4
𝑚3
2,67 𝑠𝑒𝑘𝑜𝑛
= 2,6841 × 10 ̄ 4 m3/s
𝑣 =
𝑄
𝐴
=
2,6841 𝑥 10−4
m3/s
3,14 𝑥 10−4 𝑚²
= 0,8548 m/s
Re =
𝑣.𝜌.𝐷
𝜇
=
0,8548 𝑥 1 𝑥 0,02
0,804 𝑥 10−6
= 21.250
Mataram, 24 November 2014
Mengetahui,
Co.Asst Praktikum Satuan Operasi I Praktikan,
Rudi Ansori PENINA
NIM. J1A012119 NIM. J1A013100

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Bab iv perhitungan

  • 1. HASIL PENGAMATAN DAN PERHITUNGAN ACARA V 5.1. Hasil Pengamatan Tabel 5.1. Hasil Pengamatan Aliran Laminar, Transisi, dan Turbulen Aliran Volume (m3) Rata-rata (m3) Re 1 2 3 Laminar 42×10 ̄ 5 m3 41×10 ̄ 5 m3 5×10 ̄ 4 m3 4,4333×10 ̄ 4 m3 1526,8 Transisi 52×10 ̄ 5 m3 54×10 ̄ 5 m3 58×10 ̄ 5 m3 5,4667×10 ̄ 4 m3 2885,5 Turbulen 7×10 ̄ 4 m3 7×10 ̄ 4 m3 75×10 ̄ 5 m3 7,1667×10 ̄ 4 m3 21.250 5.2. Hasil Perhitungan Diketahui : ρ = 1 Kg/m/s D = 0,02 m r = 0,01 m 𝐴 = 𝜋𝑟2 = 3,14 x 10-4 m2 𝜇 = 0,804 x 10-6 m2 Ditanya : a. Debit (Q) =........? b. Kecepatan (v) =........? c. bilangan Reynold (Re) =........?
  • 2. Penyelesaian : 1. Aliran Laminar Diketahui : V rata-rata =443,33 ml ÷1 x 106 = 4,4333×10 ̄ 4 m3 Waktu (t) = 23 sekon 𝑄 = 𝑉𝑜𝑙𝑢𝑚𝑒 𝑟𝑎𝑡𝑎−𝑟𝑎𝑡𝑎 𝑊𝑎𝑘𝑡𝑢 = 4,4333×10 ̄ 4 m3 23 𝑠𝑒𝑘𝑜𝑛 = 0,19275×10 ̄ ⁴ m3/s 𝑣 = 𝑄 𝐴 = 0,19275 ×10 ̄ ⁴ 𝑚³/𝑠 3,14 𝑥 10 ̄ ⁴ 𝑚² = 0,06138 m/s Re = 𝑣.𝜌.𝐷 𝜇 = 0,06138 𝑥 1 𝑥 0,02 0,804 𝑥 10−6 = 1,2276 ×10 ̄ ³ 0,804 𝑥 10−6 = 1,5268 × 10 ³ = 1526,8 2. Aliran Transisi Diketahui : V rata-rata = 546,67 ml : 1 x 106 = 5,4667×10 ̄ 4 m3 Waktu (t) = 15 sekon 𝑄 = 𝑉𝑜𝑙𝑢𝑚𝑒 𝑟𝑎𝑡𝑎−𝑟𝑎𝑡𝑎 𝑊𝑎𝑘𝑡𝑢 = 5,4667 𝑥 10−4 𝑚3 15 𝑠𝑒𝑘𝑜𝑛 = 0,3644 𝑥 10−4 m3/s 𝑣 = 𝑄 𝐴 = 0,3644 𝑥 10−4 𝑚³/𝑠 3,14 𝑥 10−4 𝑚² = 0,1160 m/s Re = 𝑣.𝜌.𝐷 𝜇 = 0,116 𝑥 1 𝑥 0,02 0,804 𝑥 10−6 = 2885,5
  • 3. 3. Aliran Turbulen Diketahui : V rata-rata = 716,67 ml : 1 x 106 = 7,1667 × 10 ̄ ⁴ Waktu (t) = 2,67 sekon 𝑄 = 𝑉𝑜𝑙𝑢𝑚𝑒 𝑟𝑎𝑡𝑎−𝑟𝑎𝑡𝑎 𝑊𝑎𝑘𝑡𝑢 = 7,1667 𝑥 10−4 𝑚3 2,67 𝑠𝑒𝑘𝑜𝑛 = 2,6841 × 10 ̄ 4 m3/s 𝑣 = 𝑄 𝐴 = 2,6841 𝑥 10−4 m3/s 3,14 𝑥 10−4 𝑚² = 0,8548 m/s Re = 𝑣.𝜌.𝐷 𝜇 = 0,8548 𝑥 1 𝑥 0,02 0,804 𝑥 10−6 = 21.250 Mataram, 24 November 2014 Mengetahui, Co.Asst Praktikum Satuan Operasi I Praktikan, Rudi Ansori PENINA NIM. J1A012119 NIM. J1A013100