A spherical weather balloon of 2 m diameter is filled with hydrogen. The total mass of the balloon skin and the instruments it carries is 3. kg. At a certain altitude the density of air is 1.0 kg/m³ and is 10 times the density of hydrogen in the balloon; the viscosity of air is 1.8x10- Ns/m3. Determine the steady upward velocity of the balloon.

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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Chapter5: Analysis Of Convection Heat Transfer
Section: Chapter Questions
Problem 5.26P
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100
10
Circular disk
Sphere
0.1
0.01
1
10
100
1,000
10,000
100,000
1,000,000 10,000,000
Reynolds number Re = U d/v
A spherical weather balloon of 2 m diameter is filled with hydrogen. The total mass of the balloon skin and the instruments it carries is 3.7
kg. At a certain altitude the density of air is 1.0 kg/m3 and is 10 times the density of hydrogen in the balloon; the viscosity of air is 1.8x10-5
Ns/m3. Determine the steady upward velocity of the balloon.
m/s
Drag coefficlent Ca
Transcribed Image Text:100 10 Circular disk Sphere 0.1 0.01 1 10 100 1,000 10,000 100,000 1,000,000 10,000,000 Reynolds number Re = U d/v A spherical weather balloon of 2 m diameter is filled with hydrogen. The total mass of the balloon skin and the instruments it carries is 3.7 kg. At a certain altitude the density of air is 1.0 kg/m3 and is 10 times the density of hydrogen in the balloon; the viscosity of air is 1.8x10-5 Ns/m3. Determine the steady upward velocity of the balloon. m/s Drag coefficlent Ca
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