DMT 40 - 47

Question 1

What is the “No-slip” condition responsible for?

Answer 1

The no-slip condition is responsible for the development of the velocity profile

Question 2

Why is a velocity profile created?

Answer 2

Because of friction between the fluid players, the layer that stick to the wall slows the adjacent fluid layer, which slows the next layer and so on.

Question 3

What is the Equation for shear stress acting on a fluid layer?

Answer 3

𝑇_𝑥𝑦=𝐹/𝐴

Question 4

What is the rate of deformation of a fluid element equivalent to?

Answer 4

The rate of deformation of a fluid is equivalent to the velocity gradient 𝑑𝑢/𝑑𝑦

Question 5

What is the equation for 𝑑𝑢/𝑑𝑦?

Answer 5

𝑑𝛽/𝑑𝑡=𝑑𝑢/𝑑𝑦

Question 6

What are Newtonian Fluids?

Answer 6

Newtonian Fluids, are fluids for which the rate of deformation is linearly proportional to the shear stress

Question 7

What are Non-Newtonian Fluids?

Answer 7

Non-Newtonian Fluids, are fluids for which the rate od deformation is not linear to the shear stress

Question 8

What is the Equation for mass flow rate?

Answer 8

𝑑𝑚̇=𝜌𝑣_𝑛 𝑑𝐴

𝑚̇=∫16𝐴▒〖𝜌𝑣(𝑛 ) 𝑑𝐴〗

Question 9

What is the Equation for Volume Flow rate?

Answer 9

𝑄̇= ∫16_𝐴▒〖𝑢_𝑛 𝑑𝐴= 𝑢_𝑚 𝐴〗

Question 10

What is the Principle of Mass conservation Equation?

Answer 10

𝜌_1 𝐴_1 𝑢_𝑚1= 𝜌_1 𝐴_1 𝑢_𝑚2= 𝑚̇