Atomization - Graco Inc.

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Progress CheckDirections: After answering the following questions, compare your answers with those provided inthe answer key following this progress check. If you respond to any items incorrectly, return to thetext and review the appropriate topics.For questions 1-4, match the atomization process with its description. In addition, write a G in thespace next to the atomization processes used in Graco fluid handling equipment.Atomization Processesa. Pressure (airless) _______b. Air (airspray) _______c. Centrifugal _______d. Electrostatic _______e. Ultrasonic ___________ 1.____ 2.____ 3.____ 4.____ 5.Introduction of fluid to the center of a spinning disk; the fluid breaks up into fine dropletsas it flows off the disk’s edgePassing fluid over a vibrating device that causes a breaking up of the fluid into dropletsExposing a fluid to an electric field that tears the droplets from the atomizer and propelsthem toward the work surfaceForcing a fluid through an orifice at high speed; friction between the fluid and the airdisrupts the fluid stream and breaks it up into dropletsA high pressure air stream that surrounds fluid under low pressure; friction disrupts thefluid stream and breaks it up into droplets6. Describe the difference between electrostatic atomization and electrostatic spray charging.________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________14Atomization®
7. To achieve desired atomization, what parameter must you change to balance increasedviscosity or fluid flow rate?a. Equilibriumb. The atomization processc. Energyd. Fluid density8. Complete the chart by checking the boxes that characterize the appropriate droplet descriptionfor each factor listed.Droplet Sizes Droplet SizesFactor Increase DecreaseIncreasing surface tensionIncreasing viscosityIncreasing size of atomizer orificeIncreasing fluid pressureDecreasing fluid pressure®Atomization 15
Page 1 and 2: Atomization®Concept and Theory Tra
Page 3 and 4: IntroductionWelcome to Atomization,
Page 5 and 6: Atomization FundamentalsLearning Ob
Page 7 and 8: Fluid Properties Affecting the Spra
Page 9 and 10: Answers to Progress Check1. b. A sp
Page 11 and 12: Figure 5 illustrates a simple circu
Page 13 and 14: With rotary atomization, operators
Page 15: Achieving Desired AtomizationAchiev
Page 19 and 20: Module EvaluationThe purpose of thi
Page 21: This module was developed by the Gr

Atomization - Graco Inc.

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