An ideal fluid isanda.incompressible, inviscidb.incompressible, irrotationalc.inviscid, uniformd.uniform, irrotationalWhich of the following is TRUE about boundary layers?a.Outside the boundary layer, the flow can be considered non-viscous.b.Purely analytical solutions are derived to obtain the solution to boundary layer problems.c. The boundary layer thickness on a flat plate decays as it moves away from its leadingedge.d. It is the region where no interaction between the boundary and the fluid occurs.Consider a 100-mm diameter plastic (SG = 1.07) sphere dropped in oil (SG = 0.85). Assumea value of 1.0 for the coefficient of drag. What is the sphere's terminal velocity?a.0.339 m/sb.0.677 m/sc.0.823 m/sd.0.582 m/sWhich of the following statements is FALSE?a.For laminar flow, the friction factor is independent of the pipe roughness.b. The friction factor is zero for smooth pipes because the relative roughness is zero.c.For fully turbulent flows in rough pipes, the friction factor becomes independent ofReynolds' number.d.For relatively low flow velocities, the friction factor tends to be higher.

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An ideal fluid is. and a.incompressible, inviscid b.incompressible, irrotational c.inviscid, uniform d.uniform, irrotational Which of the following is TRUE about boundary

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.

Question

An ideal fluid is
and
a.incompressible, inviscid
b.incompressible, irrotational
c.inviscid, uniform
d.uniform, irrotational
Which of the following is TRUE about boundary layers?
a.Outside the boundary layer, the flow can be considered non-viscous.
b.Purely analytical solutions are derived to obtain the solution to boundary layer problems.
c. The boundary layer thickness on a flat plate decays as it moves away from its leading
edge.
d. It is the region where no interaction between the boundary and the fluid occurs.
Consider a 100-mm diameter plastic (SG = 1.07) sphere dropped in oil (SG = 0.85). Assume
a value of 1.0 for the coefficient of drag. What is the sphere's terminal velocity?
a.0.339 m/s
b.0.677 m/s
c.0.823 m/s
d.0.582 m/s
Which of the following statements is FALSE?
a.For laminar flow, the friction factor is independent of the pipe roughness.
b. The friction factor is zero for smooth pipes because the relative roughness is zero.
c.For fully turbulent flows in rough pipes, the friction factor becomes independent of
Reynolds' number.
d.For relatively low flow velocities, the friction factor tends to be higher.

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