Seeding Particles Enhance Acoustic Particle Processing
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Solution Overview
Problem
Conventional macro-scale acoustic systems for particle manipulation are limited by low scalability, continuous operation, and energy inefficiency, as they rely on planar acoustic waves that fail to trap particles continuously and generate excessive heat.
Innovation Solution
The use of an ultrasonic transducer with a deformable piezoelectric material capable of generating multi-directional acoustic waves, which introduces 'seeding particles' with higher or similar contrast factors to enhance acoustic forces, allowing for improved particle retention and increased flow rates in acoustic particle processing devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If planar acoustic standing waves are used for particle manipulation, then particles can be trapped at nodes or anti-nodes, but the operation is not continuous and particles remain suspended until the wave is removed
Solution Approach 1:
The patent applies dynamics by transitioning from static planar standing waves to dynamic focused acoustic waves that can be continuously modulated. The acoustic field is dynamically adjusted to maintain particle trapping continuously through controlled focusing and defocusing cycles, enabling continuous manipulation rather than intermittent trapping.
Solution Approach 2:
The patent implements periodic action through cyclic focusing and defocusing of acoustic waves. The acoustic field is periodically concentrated to trap particles and then dispersed to allow collection, creating a continuous cyclic process that maintains ongoing particle manipulation and enables continuous operation of the separation system.
2Reliability
If planar acoustic standing waves are used for particle manipulation, then particles can be trapped, but excessive power is consumed which heats the fluid through waste energy
Solution Approach 1:
The patent applies local quality by concentrating acoustic energy locally at the focal point rather than distributing it uniformly across a planar field. This localized focusing delivers the necessary acoustic pressure for effective particle trapping only where needed, significantly reducing overall power consumption and minimizing waste heat generation in the bulk fluid.
Solution Approach 2:
The patent uses dynamic focusing to concentrate acoustic energy only when and where particle trapping is required. The acoustic field is dynamically adjusted to match the temporal and spatial needs of the process, reducing unnecessary energy expenditure and associated heat generation compared to continuous planar wave operation.
3Reliability
If conventional acoustic systems operate at low flow rates to achieve minimal fluid dynamic optimization, then particle manipulation can occur, but scalability is limited
Solution Approach 1:
The patent applies dynamics by using continuously adjustable focused acoustic waves that can adapt to varying flow rates. The focusing parameters can be dynamically optimized for different operating conditions, allowing the system to maintain effective particle manipulation across a wide range of flow rates from micro-liter to liter per minute, enabling scalability.
Solution Approach 2:
The patent implements parameter changes by adjusting acoustic frequency, power, and focusing parameters to optimize particle trapping at different flow rates. This allows the system to maintain effective manipulation across varying operational scales, from low flow rates suitable for research to high flow rates for industrial applications.
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
This approach enables continuous particle manipulation and separation with higher flow rates, forming tightly packed clusters that can be efficiently collected, overcoming the limitations of conventional systems by increasing acoustic forces and reducing energy waste.
Implementation Method 1
an ultrasonic transducer including a piezoelectric material is coupled to a chamber to permit an acoustic wave to be generated within the chamber. The piezoelectric material is configured to be excited to launch an acoustic wave in the chamber.
Implementation Method 2
acoustic waves can exert forces on particles in a fluid when there is a differential in density and/or compressibility between the particles and fluid... the pressure profile includes areas of local minimum pressure amplitudes at standing wave nodes... particles become trapped at the nodes or anti-nodes of the standing wave
Data Source
AI summary
Acoustic forces in an acoustic field can be increased via introduction of “seeding particles” with higher or similar contrast factor and/or size relative to the particles targeted for retention in the acoustic field. This feature may be implemented in an acoustic concentration device or an acoustic separation device. Increases in acoustic forces lead to better particle retention and can permit increased flow rates through an acoustic particle processing device.