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Additional practice problems

Additional practice problems We want to transport 200 gal/min of a fluid through a 3-in pipe. The available pressure drop is 28 psi per 1000 ft. The fluid properties are: SG 0.75, viscosity=0.1 cP. Is a 3-in pipe big enough? Answer: 3 in pipe should be big enough.

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Additional practice problems

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  1. Additional practice problems We want to transport 200 gal/min of a fluid through a 3-in pipe. The available pressure drop is 28 psi per 1000 ft. The fluid properties are: SG 0.75, viscosity=0.1 cP. Is a 3-in pipe big enough? Answer: 3 in pipe should be big enough. (hint: calculate velocity, Re and use Fig 6.10 to find out epsilon/D. Further calculate ‘f’ and use it in the equation for pressure drop per unit length. The pressure drop per unit length = 27.1 psi/1000 ft). A spherical balloon is 10 ft in diameter and has a buoyant force of 0.1 lbf greater than its weight. What is its terminal velocity rising through air? Answer: 1.48 ft/s (hint: use equation for velocity as v= (2*F/((pi/4)*D^2*rho*Cd)))^0.5, where F is force. To get the velocity value use Cd as 0.4. After you get the velocity, calculate the particle Re. Then you use Fig 6.24 to get new value of Cd corresponding to particle Re. At new value of Cd, if particle Re matches with the one reported in Fig. 6.24 then accept that your final value of velocity. The solution is trial and error)

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