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Thermal lenses caused by any acoustic source

100%

Perelomova A.

Hydroacoustics

2003

tom Vol. 6

171--176

The modern theory concerning to the heating cased by powerful sound source is presented. In contrast to the well-known approach allowing to calculate slowly varying heating due to periodic ultrasound, any acoustic sources may be treated. Subtle temporal structure of thermal lens forming may be traced. Formulae governing the forming of the thermal lens by arbitrary (including non-periodic) source are presented. The process is illustrated by some figures.

Thermal self-action effects for acoustic beams containing fronts in a Maxwell relaxing fluid

80%

Perelomova A.

Open Physics

2014

tom 12

nr 5

315-322

This paper examines the thermal self-action of acoustic beams in a Maxwell relaxing fluid. This type of thermal self-action differs from that in a Newtonian fluid and behaves differently depending on a ratio of sound period and time of thermodynamic relaxation. The self-action which relates to sound beams containing shock fronts is also discussed. In addition, stationary and non-stationary types of self-action are considered.

Non-stationary thermal self-action of acoustic beams containing fronts in thermoconducting fluid

80%

Perelomova A.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2016

tom Vol. 20, No 2

219--230

Non-stationary thermal self-action of a periodic or impulse acoustic beam containing shock fronts in a thermoconducting Newtonian fluid is studied. Self-focusing of a saw-tooth periodic and impulse sound is considered, as well as that of a solitary shock wave which propagates with the linear sound speed. The governing equations of the beam radius are derived. Numerical simulations reveal that the thermal conductivity weakens the thermal self-action of the acoustic beam.

Thermal Self-Action of Acoustic Beams Containing Several Shock Fronts

70%

Perelomova A.

Archives of Acoustics

2015

tom Vol. 40, No. 4

539--546

Thermal self-action of an acoustic beam with one discontinuity or several shock fronts is studied in a Newtonian fluid. The stationary self-action of a single sawtooth wave with discontinuity (or some integer number of these waves), symmetric or asymmetric, is considered in the cases of self-focusing and self-defocusing media. The results are compared with the non-stationary thermal self-action of the periodic sound. Thermal self-action of a single shock wave which propagates with the various speeds is considered.