3013-11 Hw-2

# 3013-11 Hw-2 - F, and (b) water at 90 F. Quartz, s.g. 2.65...

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1 of 1 CHE 3013 Rate Operations I Fall 2011 Homework 2 Due: Friday, September 2, 2011 3 Problems, 9 points total 1. (3 points) A hollow sphere, 5.00 mm in diameter, with a mass of 0.0500 g, is released in a column of liquid and attains a terminal velocity of 0.500 cm/s. The liquid density is 0.900 g/cm 3 . The local gravitational acceleration is 980.7 cm/sec 2 . (a) Calculate the drag force on the sphere in dynes. (b) Calculate the drag coefficient. (c) What is the viscosity of the liquid? Answers : (a) 8.7 dynes, (b) C D = 396, (c) 3.7 g/cm s 2. (3 points) Estimate the terminal velocity in ft/s of a 0.2 inch diameter quartz sphere in (a) a 90 weight percent solution of glycerin in water at 90
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Unformatted text preview: F, and (b) water at 90 F. Quartz, s.g. 2.65 90 wt % glycerin at 90 F Viscosity 219 cP Density 76.81 lb m /ft 3 3. (3 points) Carbon monoxide is produced by a partial oxidation of methane with air. The reactor consists of 2 inch diameter tubes packed with 6 feet of 0.2 inch x 0.2 in cylindrical catalyst pellets. The reactants enter at 900 F and 30 psia with a superficial velocity of 6.0 ft sec. What is the pressure drop across the packed tubes in in-H 2 O. Average properties of the reacting mixture: Density 0.0292 lb m /ft 3 Viscosity 0.051 cP Catalyst sphericity 1.0 (for short cylinders) Bed porosity 0.4...
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