Consider 0.8-cm-diameter hail that is falling freely in atmospheric air at 1 atm and 5°C. Determine the terminal velocity of the hail. Take the density of hail to be 910 kg/m3. Take the density and kinematic viscosity of air at 1 atm and 5°C as ρ = 1.269 kg/m3 and v = 1.382 × 10–5 m2/s. The figure for the average drag coefficient for cross-flow over a smooth circular cylinder and a smooth sphere is given below. Find the terminal velocity of the hail:

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
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Chapter11: Heat Transfer By Radiation
Section: Chapter Questions
Problem 11.40P
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Consider 0.8-cm-diameter hail that is falling freely in atmospheric air at 1 atm and 5°C. Determine the terminal velocity of the hail. Take the density of hail to be 910 kg/m3. Take the density and kinematic viscosity of air at 1 atm and 5°C as ρ = 1.269 kg/m3 and v = 1.382 × 10–5 m2/s. The figure for the average drag coefficient for cross-flow over a smooth circular cylinder and a smooth sphere is given below.

Find the terminal velocity of the hail:

400
200
100
60
40
20
10
4
Smooth cylinder:
1
0.6
0.4
0.2
Smooth sphere -
0.1
0.06
10-1
100
10!
102
103
104
105
106
Re
17
Transcribed Image Text:400 200 100 60 40 20 10 4 Smooth cylinder: 1 0.6 0.4 0.2 Smooth sphere - 0.1 0.06 10-1 100 10! 102 103 104 105 106 Re 17
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