The mean velocity gradient is zero at the centreline for ___________

1.	The mean velocity gradient is zero at the centreline for ___________
A.	jets
B.	mixing flows
C.	mixing flows and wakes
D.	jets and wakes
Answer» E.

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The velocity at cross-stream of a turbulent wake is calculated using the formula\(\frac{U_{max}-U}{U_{max}-U_{min}}=b(\frac{y}{b})\) Note:Umax→ Maximum velocity at a particular cross-sectionUmin→ Minimum velocity at a particular cross-sectiony → Distance in the cross-stream direction from the centre line at the cross sectionb → Cross-stream half widthU → Velocity at the distance ‘y’The minimum velocity here corresponds to _____________
The mean velocity gradient is zero at the centreline for ___________
Which of these is correct for turbulent jets?Note:Umax → Maximum velocity at a particular cross-sectionUmin → Minimum velocity at a particular cross-sectiony → Distance in the cross-stream direction from the centre line at the cross sectionb → Cross-stream half widthU → Velocity at the distance ‘y’.
If y is the distance in the cross-stream direction from the centre line at a particular cross-section b → Cross-stream half width. The mean velocity gradients and all the velocity fluctuations become zero when the value \(\frac{y}{b}\) ___________
Which of these is correct for mixing layer turbulent flows?Note:Umax → Maximum velocity at a particular cross-sectionUmin → Minimum velocity at a particular cross-sectiony → Distance in the cross-stream direction from the centre line at the cross sectionb → Cross-stream half widthU → Velocity at the distance ‘y’.
Turbulent entrainment leads to ___________
The velocity of a free turbulent flow at any particular distance in the cross-stream direction is a function of ___________
A turbulent jet is formed because ___________
Which of these terms represent the burst of turbulent activity to the outer region?
The process which is responsible for spreading of turbulent flows in the flow direction is __________

The mean velocity gradient is zero at the centreline for ___________

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