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A very simple mechanism of acoustic amplification was first identified by Lord Rayleigh in 1878. [4] [5] In simple terms, Rayleigh criterion states that amplification results if, on the average, heat addition occurs in phase with the pressure increases during the oscillation. [1].
Geometrical acoustics is an approximate theory, valid in the limiting case of very small wavelengths, or very high frequencies. The principal task of geometrical acoustics is to determine the trajectories of sound rays. The rays have the simplest form in a homogeneous medium, where they are straight lines. If the acoustic parameters of the ...
In about 1887, Lord Rayleigh discussed the possibility of pumping heat with sound. In 1969, Rott reopened the topic. [4] Using the Navier-Stokes equations for fluids, he derived equations specific for thermoacoustics. [5] Linear thermoacoustic models were developed to form a basic quantitative understanding, and numeric models for computation.
The Keller–Miksis equation takes into account the viscosity, surface tension, incident sound wave, and acoustic radiation coming from the bubble, which was previously unaccounted for in Lauterborn's calculations. Lauterborn solved the equation that Plesset, et al. modified from Rayleigh's original analysis of large oscillating bubbles. [6]
In optics, Rayleigh proposed a well-known criterion for angular resolution. His derivation of the Rayleigh–Jeans law for classical black-body radiation later played an important role in the birth of quantum mechanics (see ultraviolet catastrophe). Rayleigh's textbook The Theory of Sound (1877) is still used today by acousticians and
The following other wikis use this file: Usage on it.wikipedia.org John William Strutt Rayleigh; Usage on pt.wikipedia.org John William Strutt; Usage on uk.wikipedia.org
The interplay of heat and sound is applicable in both conversion ways. The effect can be used to produce acoustic oscillations by supplying heat to the hot side of a stack, and sound oscillations can be used to induce a refrigeration effect by supplying a pressure wave inside a resonator where a stack is located. In a thermoacoustic prime mover ...
A specialist in acoustics, particularly underwater sound, Lindsay’s career began in experimental physics, but eventually focused on the creation of thought-provoking physics books and courses. His innovative courses, such as “The Role of Science in Civilization” and “Energy and Man”, went beyond mere technical knowledge.