کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
978704 933300 2006 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Energy and momentum of sound pulses
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه ریاضیات فیزیک ریاضی
پیش نمایش صفحه اول مقاله
Energy and momentum of sound pulses
چکیده انگلیسی

The energy and momentum of three-dimensionally localized sound pulses are shown to be constant in time for propagation in fluids of negligible viscosity. Further, the energy always exceeds the product of the momentum and the speed of sound. This property follows from the fact that three-dimensionally localized pulses are necessarily converging or spreading (they have a focal region). A consequence of this convergence/divergence is that the associated pressure gradient, density gradient and particle velocity are not purely longitudinal, as they are for pulses localized in only one dimension. The velocity remains curl-free up to second order, however. Analytic values of energy and momentum are obtained from a particular localized solution of the wave equation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica A: Statistical Mechanics and its Applications - Volume 363, Issue 2, 1 May 2006, Pages 217–225
نویسندگان
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