Abstract
Pulsed laser ablation of Ni targets in liquid CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> near the critical point (C.P.) (P <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">crit</sub> = 7.38 MPa, T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">crit</sub> = 304.1 K) was performed and the time evolution of the plasma and the ensuing cavitation bubble analyzed by shadowgraph imaging. Formation of double-layered anomalous cavitation bubbles was observed inside the liquid phase close to the C.P. The size and propagation speed of the cavitation bubbles were measured and it was found that in the experimental range investigated (P = 7.20-7.40 MPa, T = 301-303 K), the size of the cavitation bubble increased by a factor of up to three for increasing pressure and temperature, whereas the propagation speed decreased.
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