Mechanical Cavitation Generation Using a Shrimp-Inspired Claw

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Solution Overview

Problem

Current devices fail to efficiently replicate the plasma generation mechanism of snapping shrimp, which produces high pressures and temperatures through cavitation, for applications in energy focusing and plasma generation in liquids.

Innovation Solution

A bio-inspired mechanical device with a dactyl plunger and propus socket, actuated by a torsion spring, mimics the snapping shrimp's mechanism by generating a high-speed water jet to induce cavitation and plasma formation, using additive manufacturing and 3D surfaces based on micro-X-ray computed tomography of a shrimp claw.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If electrical, acoustic, or light methods are used to generate plasma in liquids, then plasma can be generated, but the conversion efficiency is low compared to natural snapping shrimp mechanisms

Engineering Contradiction:

Improveconversion efficiencyVSAvoiddevice complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent creates artificial replicas of snapping shrimp claws using 3D printing technology. The artificial claws are designed to mimic the natural shrimp claw geometry and snapping mechanism, achieving efficient cavitation-based plasma generation without requiring complex electrical or acoustic systems. This copying approach transfers the high-efficiency natural mechanism to an artificial device.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent replaces complex electrical, acoustic, or optical systems with a simple mechanical snapping mechanism. By using a torsion spring-loaded artificial claw that mimics natural shrimp anatomy, the system achieves plasma generation through mechanical cavitation alone, eliminating the need for complicated energy conversion systems while improving overall efficiency.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Productivity

If complex electrical or acoustic systems are used to generate cavitation, then plasma can be produced, but the devices are less efficient and more complex than natural shrimp mechanisms

Engineering Contradiction:

Improveplasma generation efficiencyVSAvoiddevice complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The artificial claw system is self-actuating through a torsion spring mechanism that stores and releases energy autonomously. The spring-loaded design allows the claw to snap shut and generate cavitation without requiring external electrical or acoustic control systems during operation, simplifying the overall device architecture while maintaining high productivity.

Inventive Principle:

Principle #25Self-service

3Loss of energy

If mechanical devices are designed to mimic snapping shrimp, then cavitation efficiency improves, but manufacturing complexity increases due to 3D printing requirements

Engineering Contradiction:

Improvecavitation energy efficiencyVSAvoidmanufacturing ease

Core Design Contradiction:

Loss of energyVSEase of manufacture

Solution Approach 1:

The patent utilizes 3D printing technology to create complex curved geometries that are impossible to manufacture with traditional methods. By changing the manufacturing approach from conventional machining to additive manufacturing, the system can incorporate optimized surface profiles and internal structures that maximize cavitation efficiency while actually simplifying the overall manufacturing process for these specific geometric requirements.

Inventive Principle:

Principle #35Parameter changes

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 device effectively reproduces the shrimp's plasma generation technique, achieving efficient cavitation and plasma formation with higher conversion efficiency compared to other methods, and is scalable for various applications.

Implementation Method 1

A spring fixture is designed to reliably actuate the claw with appropriate force and velocity

Methodology Applied

Scientific EffectElastic potential energy: Elasticity

Implementation Method 2

The rapidly closing dactyl plunger induces a high-speed water jet to issue from the channel that initiates cavitation

Methodology Applied

Scientific EffectCavitation: Cavitation

Implementation Method 3

cavitation which collapse to produce high pressures and temperatures, leading to efficient plasma formation with photon and shock wave emission

Methodology Applied

Scientific EffectShock wave: Shock Wave

Data Source

PatentUS11193513B2Efficient mechanical generation of cavitation in liquids

Publication Date: 2021.12.07 TEXAS A&M UNIVERSITY

AI summary

In an embodiment, the present disclosure pertains to a cavitation generation device that includes a dactyl plunger rotatable about an axis between an open position and a closed position and a propus socket having a channel. The propus socket is rigidly mounted below the dactyl plunger, and the dactyl plunger is received into the propus socket when the dactyl plunger is in the closed position. The cavitation generation device can also include a torsion spring that biases the dactyl plunger into contact with the propus socket. In another embodiment, the present disclosure pertains to a method of inducing a cavitation including biasing a dactyl plunger via a torsion spring, and rotating the dactyl plunger, by action of the torsion spring, into a propus socket. The propus socket includes a nozzle-shaped channel. The method further includes ejecting a socket cavity volume through the nozzle-shaped channel thereby inducing a cavitation event.