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2nd YEAR FLUIDS / COMPRESSIBLE FLOW |
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3. COMPRESSIBLE FLOW
CONTENTS
3.1 INTRODUCTION 3.2 SPEED OF SOUND 3.3 ISENTROPIC FLOW 3.4 NORMAL SHOCK WAVES 3.5 TWO-DIMENSIONAL WAVES
3.1 INTRODUCTION - IN LIQUIDS, THE EFFECTS OF PRESSURE ON DENSITY ARE SMALL ENOUGH TO BE CONSIDERED INSIGNIFICANT. LIQUID FLOWS ARE CONSEQUENTLY INCOMPRESSIBLE FLOWS. - FOR GASES, THE IDEAL GAS EQUATION, P = RT, SHOWS THAT PRESSURE CAN HAVE SUBSTANTIAL EFFECTS ON DENSITY. - THUS GAS FLOWS WHICH INVOLVE LARGE PRESSURE CHANGES, WILL ALSO INVOLVE CHANGES IN DENSITY AND WOULD BE COMPRESSIBLE FLOWS. - CHANGES IN DENSITY WILL THEN THROUGH CONTINUITY, m = A U, CAUSE FURTHER CHANGES IN THE FLUID VELOCITY.
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