Critical Velocity

IMPORTANT

Critical Velocity: Overview

This topic covers concepts, such as, Condition for Start of Turbulence, Reynolds Number, Condition for Laminar Flow, Critical Velocity & Significance of Reynolds Number etc.

Important Questions on Critical Velocity

EASY
IMPORTANT

If p is the density and η is coefficient of viscosity of fluid which flows with a speed v in the pipe of diameter d, the correct formula for Reynolds number Re is

HARD
IMPORTANT

Here we know that for turbulent flow, we need a certain limit of Reynolds number. So, what is Reynold's number?

HARD
IMPORTANT

Water from a pipe is coming at a rate of 100 liters per minute. If the radius of the pipe is 5 cm, the Reynolds number for the flow is of the order of: (density of water = 100 kg/m3, coefficient of viscosity of water =1 mPa s)

HARD
IMPORTANT

Water from a pipe is coming at a rate of 100 liters per minute. If the radius of the pipe is 5 cm, the Reynolds number for the flow is of the order of: (density of water = 100 kg/m3, coefficient of viscosity of water =1 mPa s)

HARD
IMPORTANT

What would be the Reynolds number if the flow is streamlined?

HARD
IMPORTANT

What would be the Reynolds number if the flow is turbulent?

EASY
IMPORTANT

Which of the following options represent the ratio of inertial force to viscous force?

MEDIUM
IMPORTANT

A liquid with coefficient of viscosity η =1 poise is flowing in a pipe of radius 3 cm such that the rate of volume flow is 1000litre/min. Determine the Reynolds number

EASY
IMPORTANT

A flow of liquid is streamline, if the Reynold's number is

EASY
IMPORTANT

In an unsteady flow the velocity at point in the flow varies with _________.

MEDIUM
IMPORTANT

In a turbulent flow, the velocity of the liquid in contact with the walls of the tube is