Question

For flow in a pipe, the Reynolds number is defined as Re=(VpD)/mu))

Where V is velocity, is density, is viscosity, and D is diameter. Expressed this way, the Reynolds number can be interpreted as

the ratio of viscous to inertial forces.
the ratio of inertial to viscous forces.
the ratio of momentum flux to viscous forces.
the ratio of kinetic energy to viscous forces.

Answer 1

Reynolds number = the ratio of inertial to viscous forces

Step-by-step explanation:

Reynolds number is defined as :

`R_e=(V_dD)/(\\u)`

Where

`V_d` is flow speed

D is diameter of the tube

`\\u` is kinematic viscosity of the fluid

• Reynolds number is defined as the ratio of inertial forces to viscous forces within a fluid which is subjected to relative internal movement due to different fluid velocities.

• So, the correct option is (b) "ratio of inertial to viscous forces".