ultrasonic cavitation and implosion self presenting

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Fundamentals of Ultrasonic Cavitaton

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2. Sound . . . Sound Is Vibration Transmitted Through an Elastic Material UltraSound . . . Sound at a Higher Frequency Sound UltraSound 3. Sound is Created by a Source of Vibration Think of the black line above as the edge view of a metal plate 4. Sound is Created by a Source of Vibration Now Imagine an Ultrasonic Transducer Attached to the Metal Plate Ultrasonic Transducer 5. Sound is Created by a Source of Vibration The Ultrasonic Transducer Vibrates and Transmits Vibration to the Metal Plate Ultrasonic Transducer 6. Sound is Created by a Source of Vibration The Ultrasonic Transducer Vibrates and Transmits Vibration to the Metal Plate 7. Sound is Created by a Source of Vibration The Ultrasonic Transducer Vibrates and Transmits Vibration to the Metal Plate 8. Sound is Created by a Source of Vibration The Ultrasonic Transducer Vibrates and Transmits Vibration to the Metal Plate 9. Sound is Created by a Source of Vibration The Ultrasonic Transducer Vibrates and Transmits Vibration to the Metal Plate 10. Sound is Created by a Source of Vibration The Ultrasonic Transducer Vibrates and Transmits Vibration to the Metal Plate 11. Sound is Created by a Source of Vibration The Ultrasonic Transducer Vibrates and Transmits Vibration to the Metal Plate 12. Sound is Created by a Source of Vibration The Ultrasonic Transducer Vibrates and Transmits Vibration to the Metal Plate 13. Sound is Created by a Source of Vibration The Ultrasonic Transducer Vibrates and Transmits Vibration to the Metal Plate 14. Sound is Created by a Source of Vibration The Ultrasonic Transducer Vibrates and Transmits Vibration to the Metal Plate 15. Sound is Created by a Source of Vibration The Ultrasonic Transducer Vibrates and Transmits Vibration to the Metal Plate 16. Sound is Created by a Source of Vibration The Ultrasonic Transducer Vibrates and Transmits Vibration to the Metal Plate 17. Sound is Created by a Source of Vibration The Ultrasonic Transducer Vibrates and Transmits Vibration to the Metal Plate 18. Sound is Created by a Source of Vibration The Ultrasonic Transducer Vibrates and Transmits Vibration to the Metal Plate 19. Sound is Created by a Source of Vibration The Ultrasonic Transducer Vibrates and Transmits Vibration to the Metal Plate 20. Now Imagine that the Metal Plate is the Bottom of a Vessel or Tank 21. Now Imagine that the Metal Plate is the Bottom of a Vessel or Tank 22. And that the Tank is Filled with Liquid 23. And that the Tank is Filled with Liquid 24. Now Lets Re-Start the Vibration 25. Now Lets Re-Start the Vibration 26. Now Lets Re-Start the Vibration 27. Now Lets Re-Start the Vibration 28. Now Lets Re-Start the Vibration 29. Now Lets Re-Start the Vibration 30. As the tank bottom raises, it pushes against the liquid thereby compressing it.The blue represents an area ofcompression. 31. The compression continues to travel through the liquid away from the source of vibration. 32. 33. 34. 35. 36. 37. 38. 39. 40. As the tank bottom lowers it pulls on the liquid creating an area of negative pressure or rarefaction 41. Continued vibration generates areas of compression and rarefaction radiating through the liquid 42. 43. 44. 45. 46. 47. 48. 49. 50. 51. 52. 53. 54. 55. 56. 57. 58. 59. 60. 61. 62. 63. 64. 65. Now add a pressure gauge to measure pressure at a given point in the liquid + - 0 66. 0 + - As the rarefactions and compressions of the sound waves pass by, the gauge sees alternating negative and positive pressure 67. 0 + - As the rarefactions and compressions of the sound waves pass by, the gauge sees alternating negative and positive pressure 68. 0 + - As the rarefactions and compressions of the sound waves pass by, the gauge sees alternating negative and positive pressure 69. 0 + - 70. 0 + - 71. 0 + - 72. 0 + - 73. 0 + - 74. 0 + - 75. 0 + - 76. 0 + - 77. 0 + - 78. 0 + - 79. 0 + - 80. 0 + - 81. 0 + - 82. 0 + - 83. 0 + - 84. 0 + - 85. 0 + - 86. 0 + - 87. 0 + - 88. 0 + - 89. 0 + - 90. 0 + - 91. A vibrating source transmits sound waves to a liquid. Sound waves, consisting of areas of rarefaction (negative pressure) and compression (positive pressure), radiate through the liquid away from the source of vibration. 92. 0 Imagine now a small defect in the liquid consisting of a bubble or speck of dirt . + - 93. . 0 The a cavitation bubble starts to grow around the defect under influence of negative pressure + - 94. 0 Growth of thecavitation bubble continues and accelerates under increasingly negative pressure + - 95. 0 Growth of thecavitation bubble continues and accelerates under increasingly negative pressure + - 96. 0 Growth of thecavitation bubble continues and accelerates under increasingly negative pressure + - 97. 0 Growth of thecavitation bubble continues and accelerates under increasingly negative pressure + - 98. 0 + - 99. The cavitation bubble shrinks under the influence of growing positive pressure 0 + - 100. 0 + - 101. 0 The catastrophic collapse of the cavitation bubble under increasing pressure results in implosion! + - 102. 0 The high energy resulting from the implosion of millions of cavitation bubbles do the work associated with ultrasonics + - 103.

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