NPTEL INTRODUCTION OF FLUID ASSIGNMENT :-1 2021 SOLUTION

 1) 

    

Kn is defined as the ratio between the mean free path of fluid molecules λ and the characterized length of the flow channel L, and it characterizes if the fluid satisfies the continuous medium hypothesis. 

SO, ANSWER  (A)

2) 

No-slip Condition of Viscous Fluids

It has been established through experimental observations that the relative velocity between the solid surface and the adjacent fluid particles is zero whenever a viscous fluid flows over a solid surface. This is known as no-slip condition.

This behavior of no-slip at the solid surface is not same as the wetting of surfaces by the fluids. For example, mercury flowing in a stationary glass tube will not wet the surface, but will have zero velocity at the wall of the tube

SO , ANSWER (B)

3) 

 The surface of the control volume is referred as a control surface and is a closed surface.

 

The surface is defined with relative to a coordinate system that may be fixed, moving or rotating.

ANS:- b

4) 

ANS :-D

5) 

ANS:- d (APPROXIMATELY)

BEST BOOK OF GATE PREPRATION

6)

ANS:- B

7) 

ANS:- C (NOT CONFORMED)

8) 

ANS:- D