sWron7 Q1. Read the following sentences and choose true (T) or false (F). a) Is)
ID: 702737 • Letter: S
Question
sWron7 Q1. Read the following sentences and choose true (T) or false (F). a) Is) O There's no heat loss in the potential fow,since the ideal fuid (2) T(x) FO The unit of momentum flux is the same as that of shear stress and the (3) Ix) FO): If the Re is higher than 2100, the flow can simply be regarded as turbulent. : There's no heat loss in the potential flow, since the ideal fluid is incompressible. momentum flux is reversely proportional to the velocity gradient. (4) T) FO) : In the turbulent flow, the total shear stress can be expressed as du T-(11 + E.) and u is the contribution of eddies dy (5) Tx) FO) : Within the Prandti boundary layer, velocity gradient varies but shear stress remains constant.Explanation / Answer
(1) True- but potential flow can also be used in compressible fluid.
(2) True- unit of nomebtum flux and shear stress is N/m2.
And momentum flux is directly peproportion to velocity gradient i.e del (v) / del(y).
(3) False-This is true only for flow inside the pipe.
If fluid is flowing over a flat plate then critical Reynolds number is 5*10^5.
Hence, critical Reynolds number depends on the geometry.
(4) False- because u is the viscosity of the fluid while Ev is the contribution from the eddies.
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