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Wavefront and group velocity in relaxing and bubbly fluids
1999 (engelsk)Inngår i: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 105, nr 6, s. 3044-3048Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In this paper it is demonstrated that a theoretical model for wave propagation may indeed correspond to a well-posed transient problem although the group velocity for finite frequencies becomes greater than the high frequency limit of the phase velocity, negative or even infinite. Sufficient conditions for causality dare derived and the particular cases of relaxing and bubbly fluids are considered so as to show-some of the properties of the group velocity concept.

sted, utgiver, år, opplag, sider
1999. Vol. 105, nr 6, s. 3044-3048
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URN: urn:nbn:se:fhs:diva-3947DOI: 10.1121/1.426960ISI: 000080778100005OAI: oai:DiVA.org:fhs-3947DiVA, id: diva2:628087
Tilgjengelig fra: 2013-06-13 Laget: 2013-06-11 Sist oppdatert: 2018-01-11bibliografisk kontrollert

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