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WorksheetsFluid Mechanics Quiz
Total questions: 13
Worksheet time: 7mins
Define the Prandtl number.
Ratio of momentum diffusivity to thermal diffusivity
Ratio of thermal diffusivity to kinematic viscosity
Ratio of convective to conductive heat transfer
Ratio of Reynolds number to Nusselt number
Which of the following best defines the Reynolds number?
Ratio of convective to conductive heat transfer
Ratio of inertial forces to viscous forces
Ratio of thermal to kinetic energy
Ratio of conduction to convection
A fluid with a high Prandtl number indicates:
Thermal diffusion dominates
Momentum diffusion dominates
Heat diffuses faster than momentum
The fluid is non-Newtonian
What does a low Nusselt number imply about the heat transfer process?
High convective heat transfer
Dominance of radiative transfer
Heat transfer is mainly by conduction
Large thermal boundary layer
Which of the following combinations represents the units of the Nusselt number?
W/m²·K
m/s
Dimensionless
kg/m³
Which of the following parameters does the Reynolds number NOT directly depend on?
Velocity
Viscosity
Density
Thermal conductivity
For laminar flow in a circular pipe with constant surface temperature, the Nusselt number is approximately:
10
0.023
3.66
1200
Which situation will most likely result in turbulent flow in a pipe?
Reynolds number less than 1000
Low velocity and small diameter
Reynolds number greater than 4000
High viscosity fluid
In the context of heat transfer, the Nusselt number is a ratio of:
Pressure drop to velocity
Inertial forces to viscous forces
Convective to conductive heat transfer
Thermal to momentum diffusivity
If a fluid has a Prandtl number less than 1, this indicates that:
Heat diffuses faster than momentum
Viscous forces dominate
The fluid is a poor conductor
The flow is laminar
Which of the following best describes the significance of the Reynolds number in fluid flow?
Indicates energy loss due to friction
Determines if the flow is compressible
Predicts the transition from laminar to turbulent flow
Measures thermal resistance of a system
The Nusselt number for turbulent flow in a pipe is typically calculated using:
Newton's Law of Cooling
Sieder-Tate equation
Fourier's Law
Bernoulli equation
Which of the following changes would increase the Reynolds number of a flow in a pipe?
Increase fluid viscosity
Decrease fluid velocity
Decrease pipe diameter
Increase fluid density
