What is the shear force of a fluid (velocity \(\vec{u}\)) near the wall for a moving wall (velocity (\(\overrightarrow{u_{wall}}\)))?

\(\vec{F}=-\mu\frac{\vec{u}}{\Delta y}\times area\)

\(\vec{F}=-\mu\frac{\vec{u}-\overrightarrow{u_{wall}}}{\Delta y}\times area\)

\(\vec{F}=-\mu\frac{\vec{u}-\overrightarrow{u_{wall}}}{\Delta y}\)

\(\vec{F}=-\mu\frac{\vec{u}}{\Delta y}\)

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1.	What is the shear force of a fluid (velocity \(\vec{u}\)) near the wall for a moving wall (velocity (\(\overrightarrow{u_{wall}}\)))?
A.	\(\vec{F}=-\mu\frac{\vec{u}}{\Delta y}\times area\)
B.	\(\vec{F}=-\mu\frac{\vec{u}-\overrightarrow{u_{wall}}}{\Delta y}\times area\)
C.	\(\vec{F}=-\mu\frac{\vec{u}-\overrightarrow{u_{wall}}}{\Delta y}\)
D.	\(\vec{F}=-\mu\frac{\vec{u}}{\Delta y}\)
Answer» C. \(\vec{F}=-\mu\frac{\vec{u}-\overrightarrow{u_{wall}}}{\Delta y}\)

Discussion

2.	Which of these represents the temperature of the fluid layer immediately near the wall at a condition analogous to no-slip? Note: Tw is the temperature at the wall.
A.	T=-1
B.	T=1
C.	T=Tw
D.	T=0
Answer» D. T=0

Discussion

Explore topic-wise MCQs in Computational Fluid Dynamics Questions and Answers.

What is the shear force of a fluid (velocity \(\vec{u}\)) near the wall for a moving wall (velocity (\(\overrightarrow{u_{wall}}\)))?

Which of these represents the temperature of the fluid layer immediately near the wall at a condition analogous to no-slip? Note: Tw is the temperature at the wall.