Thermoacoustic device and method of making the same
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Solution Overview
Problem
Thermoacoustic instabilities have been theorized and demonstrated only for fluids, with no evidence of their existence in solid media, limiting the understanding and application of this phenomenon in solid-state systems.
Innovation Solution
A theoretical and numerical framework is developed to demonstrate the existence of thermoacoustic instability in a solid metal rod subject to a prescribed temperature gradient, using a three-dimensional model that uncovers the fundamental mechanism and shows self-sustained vibrations driven by thermoacoustic instability, differing from classical thermoelasticity due to heat and sound propagation characteristics in solids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temperature gradient is applied to a solid metal rod, then self-sustained vibrations can be generated through thermoacoustic instability, but this phenomenon has not been previously demonstrated in solid media limiting practical applications
Solution Approach 1:
The patent applies a temperature gradient parameter to the solid metal rod, changing the thermal state from uniform to non-uniform. This parameter change triggers the thermoacoustic instability mechanism, causing self-sustained vibrations. The temperature gradient serves as the critical parameter that transforms the system from a stable solid to one exhibiting active thermoacoustic oscillations, thereby proving the phenomenon's existence in solid media.
2Stability of the object's composition
If classical thermoelasticity is used to describe solid response, then the system remains stable with bounded amplitude, but it cannot capture the self-amplifying thermoacoustic oscillations observed in fluids
Solution Approach 1:
The patent replaces the classical thermoelastic mechanical model with a coupled thermoacoustic model that incorporates fluid-like oscillation mechanisms. Instead of treating the solid purely through elastic wave equations, the invention introduces acoustic wave equations coupled with heat transfer equations, allowing the system to exhibit self-amplifying oscillations similar to fluid thermoacoustics while maintaining solid material properties.
3Reliability
If multi-stage configuration is implemented, then stability and efficiency are enhanced, but device complexity increases
Solution Approach 1:
The patent divides the solid metal rod into multiple stages or sections, each subjected to different temperature gradient conditions. This segmentation allows independent optimization of each stage's thermal and mechanical properties, enhancing overall system stability and efficiency. The multi-stage configuration enables better control over the thermoacoustic oscillation characteristics while distributing the thermal load across multiple segments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The framework confirms the existence of thermoacoustic instabilities in solids, providing insights into self-sustained oscillations and potential applications in solid-state thermoacoustic engines and refrigerators, with a multi-stage configuration enhancing stability and efficiency.
Implementation Method 1
a temperature gradient applied to a longitudinal axis of the bar
Implementation Method 2
self-sustained vibrations driven by a thermoacoustic instability phenomenon
Implementation Method 3
A thermal conductivity of the stage is higher than a thermal conductivity of the bar
Implementation Method 4
A heat capacity of the stage is higher than a heat capacity of the bar
Data Source
AI summary
A thermoacoustic device includes a stage coupled to a bar, wherein the stage includes a first heating component on a first terminus of the stage. The stage further includes a first cooling component on a second terminus of the stage. A thermal conductivity of the stage is higher than a thermal conductivity of the bar. A heat capacity of the stage is higher than a heat capacity of the bar.