Homework_C7

# Homework_C7 - (b Compute the friction factor(c Determine...

This preview shows page 1. Sign up to view the full content.

Homework Set # 7 Due Date 09 -28- 05 Problem #1: What pressure drop is needed for pumping water at 20 C, through a pipe of 25 cm diameter and 1234 m length at the rate of 1.97 m 3 /s? The pipe is at the same elevation through out and contains four standard radius 90 0 elbows and two 45 0 elbows. The resistance of s standard radius 90 0 elbow is roughly equivalent to that offered by a pipe whose length is 32 diameters; a 45 0 elbow, 15 diameters. Problem #2: A hollow sphere, 5 mm in diameter, with a mass of 0.05 g, is released in a column of liquid and attains a terminal velocity of 0.5 cm/s. The liquid density is 0.9 g/cm 3 . The local gravitational acceleration is 980.7 cm/s 2 . The sphere is far enough from the containing wall so that their effect can be neglected. (a) Compute the drag force on the sphere in dynes
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: (b) Compute the friction factor (c) Determine the viscosity of the liquid in centipoises Problem #3: A horizontal tube with diameter 4 in. and length 5.5 ft is packed with glass spheres of diameter 1/16 in., and the void fraction is 0.41. Carbon dioxide is to be pumped through the tube at 300K, at which temperature its viscosity is known to be 1.495 10-4 g/cm-s. Assuming ideal gas, (a) What will be the mass flow rate through the column when the inlet and outlet pressures are 25 atm and 3 atm, respectively? (b) Prove that Darcy’s law could be applied for gas flow in a porous medium. Problem #4: In a calculation using the Blasius formula for turbulent flow in pipes, The Reynolds number used was too low by 4%. Calculate the resulting error in the friction factor....
View Full Document

## This note was uploaded on 09/01/2011 for the course PGE 312 taught by Professor Peters during the Fall '08 term at University of Texas.

Ask a homework question - tutors are online