Chemical Engineering :: Fluid Mechanics
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In case of laminar flow of fluid through a circular pipe, the
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Which of the following facilitates close control of flow of fluids ?
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Fanning friction factor equation applies to the __________ fluid flow.
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Stoke's equation is valid in the Reynolds number range
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When a fluid flows over a solid surface, the
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Pick out the wrong statement about cavitation.
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The maximum delivery pressure of a reciprocating compressor may be about __________ kg/cm2.
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The velocity for subsonic flow in a pipeline
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Permanent pressure loss in a well designed venturimeter is about __________ percent of the venturi differential.
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The ratio of pressure forces to inertial forces is called the __________ number.
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A.
shear stress over the cross-section is proportional to the distance from the surface of the pipe.
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B.
surface of velocity distribution is a paraboloid of revolution, whose volume equals half the volume of circumscribing cylinder.
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C.
velocity profile varies hyperbolically and the shear stress remains constant over the cross-section.
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D.
average flow occurs at a radial distance of 0.5 r from the centre of the pipe (r = pipe radius).
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A.
Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation.
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B.
Cavitation may be caused due to boiling of liquid by decreasing the pressure resulting in formation & collapse of vapor cavities.
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C.
Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines resulting in audible noise.
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D.
Large scale cavitation can not damage pipeline, restrict fluid flow and damage steam turbine blades.
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