$\text {The pressure drop in \(10 \mathrm {~m}$ of a turbulent flow in a pipe is $200 \mathrm {~Pa}$. The time-average velocity,}\) $\text {in the pipe at three radial locations, is measured to be:}$ \[\begin{array} { c c c c } \bar { u } ( \mathrm {~m} / \mathrm { s } ) & 7.24 & 7.07 & 6.72 \\ r ( \mathrm {~mm} ) & 23 & 25 & 27 \end{array}\] $\text {The eddy viscosity at \(r = 25 \mathrm {~mm}$ is nearest (neglect the kinematic viscosity):}\)

A) $0.00163 \mathrm {~m} ^ { 2 } / \mathrm { s }$ B) $0.00181 \mathrm {~m} ^ { 2 } / \mathrm { s }$ C) $0.00192 \mathrm {~m} ^ { 2 } / \mathrm { s }$ D) $0.00227 \mathrm {~m} ^ { 2 } / \mathrm { s }$ A) $0.00163 \mathrm {~m} ^ { 2 } / \mathrm { s }$ B) $0.00181 \mathrm {~m} ^ { 2 } / \mathrm { s }$ C) $0.00192 \mathrm {~m} ^ { 2 } / \mathrm { s }$ D) $0.00227 \mathrm {~m} ^ { 2 } / \mathrm { s }$

Exam 15: Fluid Dynamics and Aerodynamics

Oil separates a 20-mm-diameter rotating shaft from its 20.5-mm-diameter bearing. The bearing is 80 cm long and the shaft rotates at 2000 rpm. The velocity gradient at the bearing Surface is nearest:

(Multiple Choice)

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Question 21

The equation (7.3.20) for the head loss is valid for both laminar and turbulent flows. We wish to pump the flow rate Q through a long pipe of diameter D, to be selected. The head loss is Proportional to what power of D, assuming a constant friction factor?

(Multiple Choice)

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Question 22

Select the incorrect statement for an inviscid flow.

(Multiple Choice)

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Question 23

$\text {If the velocity potential in an inviscid flow is given by \phi = A y, where $\mathrm { A }$ is a constant, the}$ $\text {stream function is:}$

(Multiple Choice)

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Question 24

A pressure drop of 200 kPa is measured over a 50-m-length of 2-mm-diameter pipe trans- porting 30 $30 ^ { \circ } \mathrm { C }$ C water. If a laminar flow exists, the flow rate is nearest:

(Multiple Choice)

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Question 25

To determine boundary-layer characteristics on a body, for example the boundary-layer thickness, we must first know the potential-flow solution. The information used from the Potential-flow solution is:

(Multiple Choice)

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Question 26

$\text {A line source of strength 2 \mathrm {~m} ^ { 2 } / \mathrm { s } is superposed with a velocity of $8 \mathrm {~m} / \mathrm { s }$ producing along-}$ $\text {slender body that resembles the one shown. The thickness h of the body is nearest:}$

(Multiple Choice)

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Question 27

$\text {The pump inputs 2 \mathrm { hp } into the flow.}$ $\text { The cast-iron pipe has a total length}$ $\text {of 100 \mathrm {~m}. Estimate the flow rate.}$

(Multiple Choice)

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Question 28

River water flows around circular 20-cm-diameter pier at 0.01 m/s. the flow is:

(Multiple Choice)

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Question 29

A traffic flow on a freeway is very dense and it is proposed that possibly a fluid flow could simulate the flow. If it was decided to study the feasibility of the proposal, which flow would Be a possibility?

(Multiple Choice)

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Question 30

$\text {The pressure drop in 10 \mathrm {~m} of a turbulent flow in a pipe is $200 \mathrm {~Pa}$. The time-average velocity,}$ $\text {in the pipe at three radial locations, is measured to be:}$ (/) 7.24 7.07 6.72 r() 23 25 27 $\text {The eddy viscosity at r = 25 \mathrm {~mm} is nearest (neglect the kinematic viscosity):}$

(Multiple Choice)

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Question 31

A bomb blast sends a shock wave through the 20 $20 ^ { \circ } \mathrm { C }$ C atmosphere. At a certain location, the shock wave is travelling at M = 3. The induced velocity behind the wave is nearest:

(Multiple Choice)

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Question 32

A cyclist, traveling 12 m/s, wears a helmet that is close to being a 36-cm-diameter sphere. The drag force acting on that helmet is approximately:

(Multiple Choice)

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Question 33

Oil separates a 20-mm-diameter rotating shaft from its 20.5-mm-diameter bearing. The bearing is 80 cm long and the shaft rotates at 2000 rpm. The velocity gradient at the bearing Surface is nearest:

The equation (7.3.20) for the head loss is valid for both laminar and turbulent flows. We wish to pump the flow rate Q through a long pipe of diameter D, to be selected. The head loss is Proportional to what power of D, assuming a constant friction factor?

Select the incorrect statement for an inviscid flow.

$\text {If the velocity potential in an inviscid flow is given by \phi = A y, where \(\mathrm { A }\) is a constant, the}$ $\text {stream function is:}$

A pressure drop of 200 kPa is measured over a 50-m-length of 2-mm-diameter pipe trans- porting 30 $30 ^ { \circ } \mathrm { C }$ C water. If a laminar flow exists, the flow rate is nearest:

To determine boundary-layer characteristics on a body, for example the boundary-layer thickness, we must first know the potential-flow solution. The information used from the Potential-flow solution is:

$\text {A line source of strength 2 \mathrm {~m} ^ { 2 } / \mathrm { s } is superposed with a velocity of \(8 \mathrm {~m} / \mathrm { s }\) producing along-}$ $\text {slender body that resembles the one shown. The thickness h of the body is nearest:}$

$\text {The pump inputs 2 \mathrm { hp } into the flow.}$ $\text { The cast-iron pipe has a total length}$ $\text {of 100 \mathrm {~m}. Estimate the flow rate.}$

River water flows around circular 20-cm-diameter pier at 0.01 m/s. the flow is:

A traffic flow on a freeway is very dense and it is proposed that possibly a fluid flow could simulate the flow. If it was decided to study the feasibility of the proposal, which flow would Be a possibility?

A bomb blast sends a shock wave through the 20 $20 ^ { \circ } \mathrm { C }$ C atmosphere. At a certain location, the shock wave is travelling at M = 3. The induced velocity behind the wave is nearest:

A cyclist, traveling 12 m/s, wears a helmet that is close to being a 36-cm-diameter sphere. The drag force acting on that helmet is approximately:

Basic Considerations

Fluid Statics

Introduction to Fluids in Motion

The Integral Forms of the Fundamental Laws

The Differential Forms of the Fundamental Laws

Dimensional Analysis and Similitude

Internal Flows

External Flows

Compressible Flow

Flow in Open Channels

Flows in Piping Systems

Turbomachinery

Measurements in Fluid Mechanics

Computational Fluid Dynamics

Filters

Exam 15: Fluid Dynamics and Aerodynamics

Oil separates a 20-mm-diameter rotating shaft from its 20.5-mm-diameter bearing. The bearing is 80 cm long and the shaft rotates at 2000 rpm. The velocity gradient at the bearing Surface is nearest:

The equation (7.3.20) for the head loss is valid for both laminar and turbulent flows. We wish to pump the flow rate Q through a long pipe of diameter D, to be selected. The head loss is Proportional to what power of D, assuming a constant friction factor?

Select the incorrect statement for an inviscid flow.

A pressure drop of 200 kPa is measured over a 50-m-length of 2-mm-diameter pipe trans- porting 30 30∘C30 ^ { \circ } \mathrm { C }30∘C C water. If a laminar flow exists, the flow rate is nearest:

To determine boundary-layer characteristics on a body, for example the boundary-layer thickness, we must first know the potential-flow solution. The information used from the Potential-flow solution is:

\text {The pump inputs 2 \mathrm { hp } into the flow.} The cast-iron pipe has a total length\text { The cast-iron pipe has a total length} The cast-iron pipe has a total length \text {of 100 \mathrm {~m}. Estimate the flow rate.}

River water flows around circular 20-cm-diameter pier at 0.01 m/s. the flow is:

A traffic flow on a freeway is very dense and it is proposed that possibly a fluid flow could simulate the flow. If it was decided to study the feasibility of the proposal, which flow would Be a possibility?

A bomb blast sends a shock wave through the 20 20∘C20 ^ { \circ } \mathrm { C }20∘C C atmosphere. At a certain location, the shock wave is travelling at M = 3. The induced velocity behind the wave is nearest:

A cyclist, traveling 12 m/s, wears a helmet that is close to being a 36-cm-diameter sphere. The drag force acting on that helmet is approximately:

Basic Considerations

Fluid Statics

Introduction to Fluids in Motion

The Integral Forms of the Fundamental Laws

The Differential Forms of the Fundamental Laws

Dimensional Analysis and Similitude

Internal Flows

External Flows

Compressible Flow

Flow in Open Channels

Flows in Piping Systems

Turbomachinery

Measurements in Fluid Mechanics

Computational Fluid Dynamics

Filters

A pressure drop of 200 kPa is measured over a 50-m-length of 2-mm-diameter pipe trans- porting 30 $30 ^ { \circ } \mathrm { C }$ C water. If a laminar flow exists, the flow rate is nearest:

$\text {The pump inputs 2 \mathrm { hp } into the flow.}$ $\text { The cast-iron pipe has a total length}$ $\text {of 100 \mathrm {~m}. Estimate the flow rate.}$

A bomb blast sends a shock wave through the 20 $20 ^ { \circ } \mathrm { C }$ C atmosphere. At a certain location, the shock wave is travelling at M = 3. The induced velocity behind the wave is nearest: