4.2 Notes RESISTANCE IN FLUID SYSTEMS

Resistance in Fluid Systems

Drag- the force opposing motion when a solid moves through a fluid

Drag occurs only when there is relative movement

Drag is depends on:

1) velocity of the object and/or fluid

2) size object

3) shape object

4) properties of the fluid

Bernoulli’s Principle

As the velocity of a fluid (or an object travelling through a fluid) increases, the pressure in the fluid decreases

Laminar and Turbulent Flow

Laminar flow is slow and smooth over a surface

Frictional drag is produced by the successive layers of the fluid

Turbulent flow is irregular with eddies and whorls causing the fluid to move in different directions

Changes in the pressure of the fluid produce pressure drag

Viscosity

A property of a fluid that describes the opposition to motion within the fluid

Viscosity for fluid resistance is similar to the coefficients of friction

What are some applications of viscosity?

What factors can effect the viscosity of fluids?

4.2 Lab Proficiencies

Set up a system to measure the flow rate of air through a tube

Measure the pressure and flow rate for air flowing through tubes of different diameter and length

Use pressure gauge to take pressure reading

4.2 Lab PreviewEQUIPMENT

Resistance Tube Set

Mechanical Breadboard

Support Rods with Base

Pressure Regulator

Flowmeter