Abstract
As opposed to conventional thermoacoustic systems, no-stack setups do not include porous material as a medium for storing and transferring heat. In such systems, heat is transported by gas parcels directly between heat exchangers. A simplified Lagrangian model has been applied to analyze no-stack standing-wave thermoacoustic systems with the aim of estimating beneficial geometrical parameters and drive ratio values. Promising configurations provided by the simplified model were also studied with computational fluid dynamics simulations. Using CFD code FLUENT, potentially more efficient setups were found with the second-law efficiency of 40% for a prime mover and 55% for a heat pump. The dependence of system performance is reported for variable system parameters. A good agreement between the simplified model and CFD results was achieved in some cases. Heat exchangers with fmite-thickness plates were additionally investigated in high-performance setups. For porosities below 25%, the thickness effect appeared to be insignificant.
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