Temporal evolution of thermocavitation bubbles using high speed video camera

J. P. Padilla-Martinez; G. Aguilar; J. C. Ramirez-San-Juan; R. Ramos-García

doi:10.1117/12.894467

9 September 2011 Temporal evolution of thermocavitation bubbles using high speed video camera

J. P. Padilla-Martinez, G. Aguilar, J. C. Ramirez-San-Juan, R. Ramos-García

Proceedings Volume 8097, Optical Trapping and Optical Micromanipulation VIII; 809727 (2011) https://doi.org/10.1117/12.894467
Event: SPIE NanoScience + Engineering, 2011, San Diego, California, United States

Abstract

In this work, we present a novel method of cavitation, thermocavitation, induced by CW low power laser radiation in a highly absorbing solution of copper nitrate (CuNO₄) dissolved in deionized water. The high absorption coefficient of the solution (α=135 cm^-1) produces an overheated region (~300cm^-1) followed by explosive phase transition and consequently the formation of an expanding vapor bubble, which later collapse very rapidly emitting intense acoustic shockwaves. We study the dynamic behavior of bubbles formed in contact with solid interface as a function of laser power using high speed video recording with rates of ~10⁵ fps. The bubble grows regularly without any significant modification of its halfhemisphere shape, it reaches its maximum radius, but it deforms in the final stage of the collapse, probably due to the bubble adhesion to the surface. We also show that the maximum bubble radius and the shock-wave energy scales are inversely with the beam intensity.

Citation Download Citation

J. P. Padilla-Martinez, G. Aguilar, J. C. Ramirez-San-Juan, and R. Ramos-García "Temporal evolution of thermocavitation bubbles using high speed video camera", Proc. SPIE 8097, Optical Trapping and Optical Micromanipulation VIII, 809727 (9 September 2011); https://doi.org/10.1117/12.894467

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