Contents

- 1 What does the Froude number tell you?
- 2 What is physical significance of Froude number?
- 3 What is Froude number and Reynolds number describe its significance?
- 4 What is the range of Froude number?
- 5 Why do we use Reynolds number?
- 6 When the Mach number is more than 6 the flow is called?
- 7 What is critical depth?
- 8 What is meant by two dimensional flow?
- 9 What is significance of Mach number?
- 10 What is critical Reynolds number?
- 11 Is Reynolds number dimensionless?
- 12 When Froude number is more than 1?
- 13 When the depth is normal which parameter is zero?
- 14 What is Reynolds number a ratio of?

## What does the Froude number tell you?

Froude number (Fr), in hydrology and fluid mechanics, dimensionless quantity used to indicate the influence of gravity on fluid motion.

## What is physical significance of Froude number?

The Froude number is used to compare the wave making resistance between bodies of various sizes and shapes. In free-surface flow, the nature of the flow (supercritical or subcritical) depends upon whether the Froude number is greater than or less than unity.

## What is Froude number and Reynolds number describe its significance?

The Froude number deals with the relationship between gravity and inertial forces, whilst the Reynolds number deals with the relationship between frictional and inertial forces. Typically free surface flows are governed by gravity forces, although affected by frictional forces as well.

## What is the range of Froude number?

A continuous supply of gas causes the Froude number in the range 0.31 ≤ (N_{Fr})_{L} < 1 to produce pressure pulsations and vibration.

## Why do we use Reynolds number?

The purpose of the Reynolds number is to get some sense of the relationship in fluid flow between inertial forces (that is those that keep going by Newton’s first law – an object in motion remains in motion) and viscous forces, that is those that cause the fluid to come to a stop because of the viscosity of the fluid.

## When the Mach number is more than 6 the flow is called?

(d) When the Mach number is more than 6, the flow is called hypersonic flow.

## What is critical depth?

Critical depth is defined as the depth of flow where energy is at a minimum for a particular discharge. Flow profiles are classified by the slope of the channel (So), yn, and yc.

## What is meant by two dimensional flow?

From Wikipedia, the free encyclopedia. Fluid motion can be said to be a two-dimensional flow when the flow velocity at every point is parallel to a fixed plane. The velocity at any point on a given normal to that fixed plane should be constant.

## What is significance of Mach number?

Mach number is an important quantity to compare the speed of any object with a speed of sound. It is a parameter to denote the speed of a flying object in air medium. In fluid dynamics, it has very vast use. Mach number is heavily studied to have a proper idea on the motion of aeroplanes and rockets.

## What is critical Reynolds number?

A critical Reynolds number is determined as a limit where the laminar flow changes to turbulent flow. If the calculated N_{Re} is greater than the critical Reynolds number N_{Rec}, the flow regime is turbulent; otherwise the flow regime is laminar.

## Is Reynolds number dimensionless?

The Reynolds number is a dimensionless number. High values of the parameter (on the order of 10 million) indicate that viscous forces are small and the flow is essentially inviscid. The Euler equations can then be used to model the flow.

## When Froude number is more than 1?

When the depth of a flow in a channel is less than critical depth (h_{c}), the flow is said to be a super-critical flow. Froude number is greater than 1 for super-critical flow.

## When the depth is normal which parameter is zero?

When the depth is normal, which parameter is zero? Explanation: Normal depth is a depth of flow in the channel. It is created when the slope of the water surface and channel bottom is the same and the water depth remains the same throughout the entire flow.

## What is Reynolds number a ratio of?

The Reynolds number is the ratio of inertial forces to viscous forces. The Reynolds number is a dimensionless number used to categorize the fluids systems in which the effect of viscosity is important in controlling the velocities or the flow pattern of a fluid.