Table of Contents

## What are the 3 components of the velocity triangle?

The vector nature of velocity is utilized in the triangles, and the most basic form of a velocity triangle consists of the tangential velocity, the absolute velocity and the relative velocity of the fluid making up three sides of the triangle.

## What is Hagen Poiseuille equation used for?

The Hagen–Poiseuille Equation (or Poiseuille equation) is a fluidic law to calculate flow pressure drop in a long cylindrical pipe and it was derived separately by Poiseuille and Hagen in 1838 and 1839, respectively.

## What is the formula for laminar flow?

Flow is proportional to pressure difference and inversely proportional to resistance: Q=P2−P1R. For laminar flow in a tube, Poiseuille’s law for resistance states that R=8ηlπr4.

## What is vf1 in velocity triangle?

Vf= Velocity of flow at entrance of the moving blade. It is the vertical component of V. Vw=Velocity of whirl at entrance of the moving blade. It is horizontal component of V.

## What is flow of velocity?

Flow velocity is the vector field that is used to describe fluid motion in a mathematical manner. The entire length of the flow velocity is referred to as the flow speed. Flow velocity in fluids is the vector field that provides the velocity of fluids at a certain time and position.

## Can you use Hagen Poiseuille for turbulent flow?

It can be successfully applied to air flow in lung alveoli, or the flow through a drinking straw or through a hypodermic needle. For velocities and pipe diameters above a threshold, actual fluid flow is not laminar but turbulent, leading to larger pressure drops than calculated by the Hagen–Poiseuille equation.

## How do you calculate flow rate through a pipe when the velocity is known?

We can use Q=A¯v to calculate the speed of flow in the aorta and then use the general form of the equation of continuity to calculate the number of capillaries as all of the other variables are known. The flow rate is given by Q=A¯v or ¯v=Qπr2 for a cylindrical vessel.

## How is flow velocity calculated?

A pitot tube is used to measure fluid flow velocity. The tube is pointed into the flow and the difference between the stagnation pressure at the tip of the probe and the static pressure at its side is measured, yielding the dynamic pressure from which the fluid velocity is calculated using Bernoulli’s equation.

## What is the formula for air flow?

Air Flow formulas. Air Flow formulas . CFM =Duct area sq ft x Velocity Standard Air=70F @ 29.92” HG (Mercury) . 1 cubic foot of standard air =0.075 pounds 13.3 cubic feet of standard air= 1 pound . FAN LAWS: .

## How is air velocity measured?

Air velocity can be measured by sensing the pressure produced by the movement of the air. This application note will describe the basic relationships between air velocity and the pressure generated by air flow. Anyone who has put their hand out the window of a moving car has experienced the force applied by moving air.

## What is a velocity triangle or velocity diagram?

As the name suggests, a velocity triangle or velocity diagram is basically a triangle indicating different components of velocities. It is used to reflect the velocities mainly in turbomachinery like,

## What is the velocity triangle of centrifugal pump?

As the name suggests, a velocity triangle or velocity diagram is basically a triangle indicating different components of velocities. Here, we will discuss the velocity triangle of centrifugal pump! We already learned that working fluid is undergoing various processes and it has different velocities due to different kinds of movements.