What is the shortcoming of analysing flow properties using quasi-one-dimensional analysis?

Inaccurate

Time consuming

No information on wall contours of nozzle

Unable to predict all the flow properties

Correct Answer : No information on wall contours of nozzle

Explanation : Flow properties at any section of the nozzle can be predicted by the quasi-one-dimensional analysis. It represents the average flow quantities. There are two major shortcomings of using this analysis. First being that it does not predict the three-dimensional flow in convergent-divergent nozzle and secondly, it does not provide us with the information of wall contours in the nozzle.

Recently Updated in Aerodynamics Questions

Which of these laws is used to find the heat flux at a point in the fluid?

Fourier law

Fick�s law

Kepler�s law

Newton�s law

Correct Answer : Option (A) : Fourier law

Explanation : Fourier law which is also known as the law of heat conduction is used to find out the heat flux at any point in the fluid. It is given by the formula:

Where, heat flux is in the y – direction
Minus sign indicates that the heat flows from high temperature to low temperature and thus q?_y is in opposite direction to the temperature gradient.

What happens to the shear stress if the thickness between the two plates is increased in a Couette flow?

Increases

Decreases

Remains same

Becomes infinite

Correct Answer : Option (B) : Decreases

Which of these laws is obeyed by a Newtonian fluid?

Prandtl law

Newtonian law

Shear stress law

Incompressible fluid law

Correct Answer : Option (C) : Shear stress law

Explanation : Newtonian fluids are characterized by those fluids that obey the shear stress law. Aeronautics domain makes use of newtonian fluids only (air, other gases). Those fluids that don’t obey shear stress law are known as non – newtonian fluids (blood).