Atomization - Graco Inc.

Answers to Progress Check1. c (G) Centrifugal atomization is the introduction of fluid to the center of a spinning disk;the fluid breaks up into fine droplets as it flows off the disk’s edge2. e Ultrasonic atomization involves passing fluid over a vibrating devices that causes abreaking up of the fluid into droplets3. d Electrostatic atomization exposes a fluid to an electric field that tears the dropletsfrom the atomizer and propels them toward the work surface4. a (G) Pressure atomization forces fluid through an orifice at high speed; friction disruptsthe fluid stream and breaks it up into droplets5. b (G) Air atomization employs a high pressure air stream that surrounds fluid under lowpressure; friction disrupts the fluid stream and breaks it up into droplets6. During electrostatic atomization, fluid droplets atomize as a result of an electric charge to thefluid. With electrostatic spray charging, the charge is applied to cause the fluid droplets to beattracted to a grounded target, while atomization is achieved by another method.7. c To achieve desired atomization, increased viscosity or fluid flow rate must be offsetor balanced by increased atomization energy.8. The droplet sizes of fluids tend to increase or decrease according to the following chart:Droplet Sizes Droplet SizesFactor Increase DecreaseIncreasing surface tension✓Increasing viscosity✓Increasing size of atomizer orifice✓Increasing fluid pressure✓Decreasing fluid pressure✓16Atomization®