EXPERIMENTAL STUDIES ON RESISTANCE REDUCTION AND VIBRATION REDUCTION BY BUBBLY LAYER

This paper has been presented in two parts. The first part presents the experimental study on flow in Air-liquid two phase mixed boundary layer of the flat plate. The flow field is visualized by light sheet in a low turbulence water tunnel. The horizontal velocity and thickness of the boundary later at the outermost edge are measured by the Laser Doppler Velocity technique. The influence on flow field by plate orientation, free stream velocity and for of air injection were also studied. The results show that the thickness of the boundary later increases as air flow rate increases, the velocity at the outermost edge of the boundary layer decreases because of air injection. The second part of the paper presents the experimental study on the reduction of vibrations of ship hull model by bubbly layers. The experiment was conducted in a circulating flow water tank. The effect of bubbly layer on free vibration were measure under several selected variations of model draft, air injection pore size, air flow rate, and water velocity. The results have shown that the response of forced vibration of ship hull model is effectively reduced by bubbly layer and the maximum reduction is approximately 50 percent.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0080439500
• Corporate Authors:

  Elsevier

  Radarweg 29
  Amsterdam,   Netherlands  1043 NX
• Authors:
  • Dong, W-C
  • Wu, F
  • Zhu, Y-X
  • Guo, R-x
• Conference:
  • Practical Design of Ships and Other Floating Structures. Proceedings of the Eighth International Symposium on Practical Design of Ships and Other Floating Structures
  • Location: Shanghai, China
  • Date: 2001-9-16 to 2001-9-21
• Publication Date: 2001

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: 7op
• Serial:
  • Volume: 2

Subject/Index Terms

• TRT Terms: Boundary layer; Bubbles; Experiments; Hulls; Laser doppler velocimeters; Reduction (Chemistry); Resistance (Mechanics); Ships; Thickness; Vibration
• Subject Areas: Design; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00823340
• Record Type: Publication
• ISBN: 0080439500
• Files: TRIS
• Created Date: Jan 7 2002 12:00AM