Q: Which of the following is the correct form of Newton's Law of Viscosity for a fluid with constant density?

$$\tau_z = -\mu \dfrac{dv}{dx}$$

Q: A Newtonian fluid with a density of $$910\ \mathrm{kg/m^3$}$$ and a viscosity of $$0.001\ \mathrm{Pa\cdot s}$$ flows through a $$2\ \mathrm{cm}$$ diameter pipe at $$2.6\ \mathrm{m/s}. $$What is the Reynolds number ($$Re) $$for this flow?

$$Re = \dfrac{910 \times 2.6 \times 0.02}{0.001}$$

Q: A liquid rises in a capillary tube due to surface tension. Which equation best describes the height of the rise?

$$h = \dfrac{2\sigma \cos \theta}{\rho g r}$$

Question 1

Which of the following best describes the driving force for momentum transfer in fluids?

Accepted Answer

Pressure difference

Question 2

According to the general molecular transport equation, what is the correct mathematical expression for the rate of transfer?

Accepted Answer

$$\psi = -\delta \dfrac{d\Gamma}{dz}$$

Question 3

A copper block is maintained at $$0^\circ C on $$one side and $$100^\circ C on $$the other. If the thermal conductivity is $$380\ \mathrm{W/m\cdot K}$$, which law would you use to calculate the heat flux?

Accepted Answer

Fourier's Law of Heat Conduction

Question 4

Which equation correctly represents Fick's Law of Diffusion for mass transfer?

Accepted Answer

$$J_{Az} = -D_{AB} \dfrac{d(C_A)}{dz}$$

Question 5

A shaft rotates inside a bearing with a 2.0 mm gap at 200 rpm. If the lubricating oil has a viscosity of $$0.1\ \mathrm{Pa\cdot s}$$, which law would you use to determine the shear stress?

Accepted Answer

Newton's Law of Viscosity

Question 6

Which of the following is the correct form of Newton's Law of Viscosity for a fluid with constant density?

Accepted Answer

$$	au_z = -\mu \dfrac{dv}{dx}$$

Question 7

In the context of transport phenomena, which parameter is defined as the mass of fluid per unit volume?

Accepted Answer

Density

Question 8

Which of the following best describes the physical meaning of the bulk modulus of elasticity ($$K) $$for a fluid?

Accepted Answer

The ratio of pressure increase to fractional decrease in volume

Question 9

A Newtonian fluid with a density of $$910\ \mathrm{kg/m^3$}$$ and a viscosity of $$0.001\ \mathrm{Pa\cdot s}$$ flows through a $$2\ \mathrm{cm}$$ diameter pipe at $$2.6\ \mathrm{m/s}. $$What is the Reynolds number ($$Re) $$for this flow?

Accepted Answer

$$Re = \dfrac{910 	imes 2.6 	imes 0.02}{0.001}$$

Question 10

Which of the following is NOT a base quantity in the SI system?

Accepted Answer

Velocity

Question 11

A flat slab of insulating material has a thickness of $$25\ \mathrm{mm}$$, with temperatures measured at $$318.4\ \mathrm{K}$$ and $$301.6\ \mathrm{K} on $$opposite faces. If the heat flux is $$35.1\ \mathrm{W/m^2$}$$, which equation would you use to calculate the thermal conductivity?

Accepted Answer

$$q = -k \dfrac{dT}{dx}$$

Question 12

Which of the following statements about mass transfer is correct?

Accepted Answer

It is driven by a concentration difference.

Question 13

The specific gravity ($$SG) of a $$fluid is defined as:

Accepted Answer

$$SG = \dfrac{\rho}{\rho_{H_2O@4^\circ C}}$$

Question 14

Which of the following is the correct SI unit for dynamic viscosity?

Accepted Answer

$$\mathrm{Pa\cdot s}$$

Question 15

A liquid rises in a capillary tube due to surface tension. Which equation best describes the height of the rise?

Accepted Answer

$$h = \dfrac{2\sigma \cos 	heta}{ho g r}$$

Question 16

Which of the following is a correct statement about the general molecular transport equation?

Accepted Answer

The rate of transfer is equal to the driving force divided by resistance.

Question 17

Which of the following is the correct dimensional formula for force in the SI system?

Accepted Answer

$$MLT^{-2}$$

Question 18

Which transport phenomenon is primarily responsible for the diffusion of oxygen from the lungs into the blood?

Accepted Answer

Mass transfer

Introduction to Transport Phenomena: Momentum, Heat, and Mass Transfer

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