The operation of these devices is based on exploiting the well-known thermoacoustic effect to induce a temperature difference across the stack and to transport heat from one end of the plate to the other. Among the advantages of thermoacoustic refrigerators are the simplicity of their design and the fact that they naturally avoid the need for harmful refrigerants such as chlorofluorocarbons (CFCs). « lessĪ thermoacoustic refrigerator may be idealized as consisting of a straight resonance tube housing a stack of parallel plates and heat exchangers, and an acoustic source. The dependence of energy losses on stack configuration and operating conditions is also examined. In particular, it is shown that the flow is dominated by the motion of vortices which result from the shedding of boundary layers from the edges of the stack. Computed results are used to analyze, for different stack configurations, the nonlinear response of the flow to different acoustic driving amplitudes and frequencies. ![]() A simplified version of the model is applied to analyze unsteady flow in the neighborhood of an idealized thermo-acoustic stack which consists of a periodic array of thin plates placed in an acoustic standing wave. Meanwhile the divergence-free velocity more » component is used to capture the nonlinear vortical perturbations due to no-slip boundaries. Irrotational motion is used to represent the action of acoustic waves. A vorticity-based formulation of the governing equation is derived which relies on the Helmholtz decomposition of the velocity vector into irrotational and divergence-free components. Thus, a simplified description of the flow is obtained which still retains the essential features of acoustically induced velocity oscillations near solid boundaries. The model is based on the assumption that the acoustic wavelength is much larger than the characteristic hydrodynamic lengthscale. Publication Date: OSTI Identifier: 6036148 Resource Type: Journal Article Journal Name: Journal of the Acoustical Society of America (United States) Additional Journal Information: Journal Volume: 94:2 pt 1 Journal ID: ISSN 0001-4966 Country of Publication: United States Language: English Subject: 03 NATURAL GAS 42 ENGINEERING 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE NATURAL GAS LIQUEFACTION REFRIGERATING MACHINERY ACOUSTIC HEATING MATHEMATICAL MODELS THERMODYNAMIC PROPERTIES GASES HELIUM POROSITY XENON ELEMENTS ENERGY SOURCES EQUIPMENT FLUIDS FOSSIL FUELS FUEL GAS FUELS GAS FUELS HEATING HIGH-FREQUENCY HEATING MACHINERY MAGNETIC-PUMPING HEATING NONMETALS PHYSICAL PROPERTIES PLASMA HEATING RARE GASES THERMOCHEMICAL PROCESSES 030300* - Natural Gas- Drilling, Production, & Processing 420200 - Engineering- Facilities, Equipment, & Techniques 990200 - Mathematics & ComputersĪ low Mach-number compressible flow model for the simulation of acoustically driven flow in a thermoacoustic stack is constructed. Naval Postgraduate School, Monterey, CA (United States).Los Alamos National Lab., NM (United States).
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