Доступ предоставлен для: Guest
Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Telecommunications and Radio Engineering
SJR: 0.202 SNIP: 0.2 CiteScore™: 0.23

ISSN Печать: 0040-2508
ISSN Онлайн: 1943-6009

Выпуски:
Том 78, 2019 Том 77, 2018 Том 76, 2017 Том 75, 2016 Том 74, 2015 Том 73, 2014 Том 72, 2013 Том 71, 2012 Том 70, 2011 Том 69, 2010 Том 68, 2009 Том 67, 2008 Том 66, 2007 Том 65, 2006 Том 64, 2005 Том 63, 2005 Том 62, 2004 Том 61, 2004 Том 60, 2003 Том 59, 2003 Том 58, 2002 Том 57, 2002 Том 56, 2001 Том 55, 2001 Том 54, 2000 Том 53, 1999 Том 52, 1998 Том 51, 1997

Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v51.i4.20
pages 22-25

Equation of State in the Set of Acoustics Equations for a Moving Non-Uniform Medium

A. Yu. Panchenko
Kharkiv National University of Radio Electronics, 14, Nauky Avenue, Kharkiv, 61166, Ukraine

Краткое описание

A broad class of devices for the diagnostics of substances and materials are based on the use of wave processes in non-uniform media. The need to increase the volume of primary information stimulates combined application of electromagnetic and acoustic waves. The mathematical formalism of acoustic waves has much in common with that of electromagnetic waves, however its development lags behind noticeably, which must be taken into account in the design of combined diagnostic systems.
The set of acoustic equations is based on the general equations of hydrodynamics. Presently a number of approaches [1-6] are used to derive such sets. However, they all have a feature in common, namely that the continuity equation and the equation of motion are constructed for a fixed volume, whereas the equation of state is constructed for a fixed mass, and hence the equation set is not designed to describe a single object. The transition to one object is not complex. In a number of simple applications it is done automatically in the process of transformations, or it can be accomplished at final stages of the analysis. Problems of greater complexity, like propagation of acoustic waves through a non-uniform moving medium, require that such a transformation should be performed at the very beginning. It is based on the energy and matter conservation laws that should be applied to a volume fixed in space and bounded by walls transparent for the transport of matter and energy. It is less suitable to use other conservation laws because the interrelations of the quantities involved are established quite simply in terms of energy. In this paper a derivation of the equation of state is considered for a volume fixed with respect to a reference frame. The full-scale derivation of this equation along with other essential relations can be represented in paper [7].


Articles with similar content:

THERMODYNAMICS OF ELLIPTIC ORBIT MOTION
International Heat Transfer Conference 16, Vol.18, 2018, issue
Zhichun Liu, Wei Liu, Liangsuo Shu, Xiaokang Liu, Kaifeng Cui, Rui Long
On the Relationship between Fluid Velocity and de Broglie's Wave Function and the Implications to the Navier - Stokes Equation
International Journal of Fluid Mechanics Research, Vol.29, 2002, issue 1
V. V. Kulish, Jose' L. Lage
Review of RANS turbulence models adapted for rotation, curvature and stress-strain lag effects in incompressible flows
ICHMT DIGITAL LIBRARY ONLINE, Vol.0, 2015, issue
Alistair Revell, Timothy J. Craft, Alexandra Stefanescu
Dispersion Properties of Coupled Microstrip Lines
Telecommunications and Radio Engineering, Vol.51, 1997, issue 4
R. D. Pulov, S. N. Romanenko, L. M. Karpukov
An Engineering Method for Calculating a Temperature Regime in the Furnace of a Fire-Tube Boiler with a Reverse Flame
Heat Transfer Research, Vol.33, 2002, issue 7&8
E. F. Nogotov, M. L. German, V. A. Borodulya, G. I. Pal'chonok