search
Log In
0 votes

The instantaneous stream-wise velocity of a turbulent flow is given as follows:

$u(x,y,z,t)=\overline{u}(x,y,z)+{u}'(x,y,z,t)$

The time-average of the fluctuating velocity ${u}'(x,y,z,t)$ is

  1. $\displaystyle{\frac{u'}{2}} \\$
  2. $\displaystyle{\frac{-\overline{u}}{2}} \\$
  3. $\text{zero}\\$
  4. $\displaystyle{\frac{\overline{u}}{2}}$
in Fluid Mechanics 24.6k points
recategorized by

Please log in or register to answer this question.

Answer:

Related questions

0 votes
0 answers
A fluid (Prandtl number, $P_r=1$) at $500\:K$ flows over a flat plate of $1.5\:m$ length, maintained at $300\: K$. The velocity of the fluid is $10 \: m/s$. Assuming kinematic viscosity,$v=30\times 10^{-6}$ $m^2/s$, the thermal boundary layer thickness (in $mm$) at $0.5 \:m$ from the leading edge is __________
asked Feb 24, 2017 in Fluid Mechanics Arjun 24.6k points
0 votes
0 answers
Oil (kinematic viscosity, $v_{\text{oil}}=1.0\times 10^{-5} \:m^2/s$) flows through a pipe of $0.5$ $m$ diameter with a velocity of $10$ $m/s$. Water (kinematic viscosity, $v_w=0.89\times 10^{-6}\:m^2/s$) is flowing through a model pipe of diameter $20 \:mm$. For satisfying the dynamic similarity, the velocity of water (in $m/s$) is __________
asked Feb 24, 2017 in Fluid Mechanics Arjun 24.6k points
0 votes
0 answers
For a floating body, buoyant force acts at the centroid of the floating body center of gravity of the body centroid of the fluid vertically below the body centroid of the displaced fluid
asked Feb 24, 2017 in Fluid Mechanics Arjun 24.6k points
0 votes
0 answers
A channel of width $450$ $mm$ branches into two sub-channels having width $300$ $mm$ and $200$ $mm$ as shown in figure. If the volumetric flow rate (taking unit depth) of an incompressible flow through the main channel is $0.9$ $m^3/s$ and the velocity in the ... , the velocity in the sub-channel of width $300$ $mm$ is _____________ $m/s$. Assume both inlet and outlet to be at the same elevation.
asked Feb 24, 2017 in Fluid Mechanics Arjun 24.6k points
0 votes
0 answers
Propane ($C_3H_8$) is burned in an oxygen atmosphere with $10$% deficit oxygen with respect to the stoichiometric requirement. Assuming no hydrocarbons in the products, the volume percentage of $CO$ in the products is __________.
asked Feb 24, 2017 in Fluid Mechanics Arjun 24.6k points
...