e peculiar fluid at very low ry is still a very import ons:

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
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ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
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Chapter5: Analysis Of Convection Heat Transfer
Section: Chapter Questions
Problem 5.9P: When a sphere falls freely through a homogeneous fluid, it reaches a terminal velocity at which the...
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One of the conditions in using the Bernoulli equation is the requirement of
inviscid flow. However there is no fluid with zero viscosity in the world except
some peculiar fluid at very low temperature. Bernoulli equation or inviscid flow
theory is still a very important branch of fluid dynamics for the following
reasons:
(i)
(ii)
There is wide region of flow where the velocity gradient is zero and so the
viscous effect does not manifest itself, such as in external flow past an un-
stalled aerofoil.
The conservation of useful energy allows the conversion of kinetic and
potential energy to pressure and hence pressure force acting normal to the
control volume or system boundary even though the tangential friction
stress is absent.
It allows the estimation of losses in internal pipe flow.
(A) (i) and (ii)
(B)
(i) and (iii)
(ii) and (iii)
All of the above
(C)
(D)
Transcribed Image Text:One of the conditions in using the Bernoulli equation is the requirement of inviscid flow. However there is no fluid with zero viscosity in the world except some peculiar fluid at very low temperature. Bernoulli equation or inviscid flow theory is still a very important branch of fluid dynamics for the following reasons: (i) (ii) There is wide region of flow where the velocity gradient is zero and so the viscous effect does not manifest itself, such as in external flow past an un- stalled aerofoil. The conservation of useful energy allows the conversion of kinetic and potential energy to pressure and hence pressure force acting normal to the control volume or system boundary even though the tangential friction stress is absent. It allows the estimation of losses in internal pipe flow. (A) (i) and (ii) (B) (i) and (iii) (ii) and (iii) All of the above (C) (D)
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