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عنوان البحث(Papers / Research Title)


INVESTIGATION OF THE TOTAL ABSORPTION ACOUSTIC COEFFICIENTS IN ZOBEAR CIT


الناشر \ المحرر \ الكاتب (Author / Editor / Publisher)

 
ايناس محمد سلمان الربيعي

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ايناس,محمد,سلمان,الربيعي ,INVESTIGATION OF THE TOTAL ABSORPTION ACOUSTIC COEFFICIENTS IN ZOBEAR CIT , Time 19/12/2016 08:23:54 : كلية العلوم للبنات

وصف الابستركت (Abstract)


The aim of this paper to present a mathematical model to study the metrological parameters effects on the total absorption coefficients A?

الوصف الكامل (Full Abstract)

As an acoustic wave propagates, all it is energy is converted into random thermal
energy. The sources of this dissipation may divide into two general categories.
Those intrinsic to the medium and those associated with boundaries of the medium.
Losses in the medium may be further subdivided into the basic types: viscous losses, heat
conduction losses, and losses associated with internal molecular processes. Viscous losses
occurs whenever there is relative motion between adjacent portions of the medium, such as
during compressions and expansions that accompany the transmission of a sound wave. Heat
conduction losses results from conduction of thermal energy from higher temperature
condensations to lower temperature rarefactions. The molecular processes leading to
absorption include the conversion of kinetic energy of molecules into1:

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