Chemical Engineering License Review, Second Edition
This text contains 146 problems with detailed step-by-step solutions, and is an ideal study guide and the first truly practical, no-nonsense review for the difficult PE Exam.
TABLE OF CONTENTS Chemical Engineering License Review, Second Edition
Fluid Statics
Static Head The static head of a fluid is the pressure at a given point in a fluid that is exerted by a vertical column of the fluid above that point. Since liquids are more or less incompressible,
| where P h | = static pressure, lbf/ft 2 |
| h | = head of liquid above the point, ft = static head |
| ? | = liquid density, lb/ft 3 |
| g | = local acceleration due to gravity, ft/s 2 |
| g c | = 32.17 lb ft/lbf s 2, dimensional constant |
When the value of g ? g c = 32.2 ft/s 2, substituting ? = s(62.4) in Eq. (2-2) gives
where s is the specific gravity of the fluid with respect to water.
Liquid Manometers The height of a liquid in an open tube connected to a pressure source (e.g., a liquid in a vessel) is a direct measure of the static pressure at the point of connection. The tubes may be straight or U-type. The pressure-measuring fluid may be different from the fluid whose pressure is to be measured. Both the open and differential tube gauges are used. The height-measuring fluid must be immiscible with the test fluid.
In an open manometer of the type shown in Fig. 2-1a, the pressure at point A (connecting point) is
| where h m | = differential height of manometric fluid, ft |
| h A | = distance between point of attachment and the interface between the test fluid and... |
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