| Autor: |
Padilla AM; School of Marine Science and Ocean Engineering, University of New Hampshire, 8 College Road, Durham, New Hampshire 03824, USA., Weber TC; Center for Coastal and Ocean Mapping, University of New Hampshire, 24 Colovos Road, Durham, New Hampshire 03824, USA. |
| Jazyk: |
angličtina |
| Zdroj: |
The Journal of the Acoustical Society of America [J Acoust Soc Am] 2021 Apr; Vol. 149 (4), pp. 2504. |
| DOI: |
10.1121/10.0004246 |
| Abstrakt: |
The study of gas bubbles in liquid media is of importance in many areas of research. Gas bubbles are often studied using in situ measurement techniques; however, acoustic inversion techniques have also been used to extract physical properties of gas bubbles. These inversion techniques rely on existing analytical scattering models; however, these models often assume that the gas bubbles are spherical in shape and have an equivalent bubble radius, a, that is small compared to the incident acoustic wavelength (ka ≪ 1), which is not always valid. This study aims to understand how the departure from these assumptions affects the acoustic backscattering cross section, σ bs , of non-spherical gas bubbles. Experimental estimates of σ bs of non-spherical gas bubbles of different sizes, with ka values ranging between 0.03 and 4.4, were compared to four commonly known analytical σ bs models. All models performed equally at predicting σ bs for ka smaller than 0.5; however, there was no model that better predicted the experimental estimates of σ bs for ka larger than 0.5, regardless of bubble shape. Large variabilities in the experimental estimates of σ bs are observed for ka larger than 0.5, which are caused by the variability in bubble shape and size, as well as the bubble's orientation. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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