TABLE OF CONTENTS Fluid mechanics is the branch of engineering which deals with the actions of forces on and by fluids. The study of fluids may be divided into two branches, hydrostatics - fluids at rest and hydrodynamics - fluids in motion.
Fluid mechanics involve the study of liquids, vapors and gasses (highly superheated vapors). Vapors and gasses usually are assumed to exert constant pressure throughout the contained volume. This of course does not hold true for our atmosphere because as we know, the barometric pressure gets less as we go higher into the atmosphere hence, pressurization of the inside of aircraft. Hydrostatics, however, deals mainly with the action of liquids. This is when the total pressure at any given point in the liquid is equal to the pressure at the surface plus the pressure exerted by the head of the liquid.
Manometers are often used to measure pressures and differential pressures. They use a column of liquid as the indication of pressure.
Pressure due to liquid column = ?gh
Where:
| ? | = | Density kg/m 3 |
| g | = | Acceleration due to gravity 9.81 m/s 2 |
| h | = | Vertical height of column of liquid m |
Therefore pressure is: P = [( ? kg/m 3)(g m/s 2)(h m)][m 2/m 2] = N/m 2 = Pa
Q:
A U tube manometer is used to measure the pressure in an air line. The 15 cm of liquid in the U tube manometer is mercury which has...
