تنزيل وتحميل كتاِب MECHANICS OF FLUIDS pdf برابط مباشر مجاناً

تنزيل وتحميل كتاِب MECHANICS OF FLUIDS pdf برابط مباشر مجاناً

وصف MECHANICS OF FLUIDS pdf

 
Hydrodynamic machines may be classified according to the direction of energy transfer (energy added or extracted) or the type of action (rotodynamic or positive displacement machines). Rotodynamic machines (momentum transfer machines) have a rotating part (runner, impeller or rotor) that is able to rotate continuously and freely in the fluid. This motion allows an uninterrupted flow of fluid which promotes a steadier discharge than positive displacement machines. Positive displacement machines have a moving boundary (such as a piston or a diaphragm) whereby fluid is drawn or forced into a finite space. This motion causes an intermittent or fluctuating flow and the flow rate is governed by the magnitude of the finite space of the machine and the frequency with which it is filled and emptied. The term pump is used when the fluid is a liquid, however, when the fluid is a gas, terms such as compressors, or fans (or blowers) are used. A compressor is a machine whose primary objective is to increase the pressure of the gas, which is accompanied by an increase in the density of the gas. A fan or blower is a machine whose primary objective is to move the gas. Static pressures remain almost unchanged, and therefore the density of the gas is also not changed.

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