Shape Memory Alloy Flow Control Device with Resistive Heating
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Solution Overview
Problem
Current flow control devices utilizing shape-memory alloys are impractical due to their slow transformation rates, which hinder rapid response times in applications requiring quick fluid regulation.
Innovation Solution
A flow control device comprising a sheet made from a shape memory alloy with electrically-resistive traces printed on or adjacent slits, allowing for rapid heat generation and deformation of flaps to open or close apertures, controlled by an adjustable electrical current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shape-memory alloys are used for flow control, then the device can return to its original shape after deformation, but the transformation from deformed shape back to original shape is slow
Solution Approach 1:
The flow control device is divided into multiple independent flow control elements, each with its own shape memory alloy sheet and heating element. This segmentation allows individual elements to be activated and deactivated independently, enabling faster overall response time by processing multiple segments in parallel rather than requiring a single large element to transform completely.
Solution Approach 2:
The device uses periodic heating cycles through the resistive heating element to accelerate the shape recovery process. By applying heat in controlled periodic bursts rather than continuous heating, the shape memory alloy transforms more rapidly from deformed to original shape, overcoming the slow transformation limitation while maintaining reliable shape recovery.
2Speed
If electrically-resistive traces are printed on the shape memory alloy sheet, then rapid heat generation is achieved for fast deformation, but the manufacturing complexity increases
Solution Approach 1:
The patent replaces traditional mechanical heating systems (such as external heaters or thermal couples) with electrically-resistive traces printed directly on the shape memory alloy sheet. This substitution of mechanical/thermal systems with electrical systems enables rapid and precise heat generation on demand, achieving fast response times while the printing process itself simplifies manufacturing compared to assembling separate heating components.
Solution Approach 2:
The resistive heating element is merged with the shape memory alloy sheet by printing the conductive trace directly onto the sheet surface. This merging of the heating function with the structural component eliminates the need for separate heating assemblies, reducing overall device complexity and simplifying manufacturing while maintaining rapid heating capability for fast flow control response.
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
Enables efficient, reliable, and rapid control of fluid flow through structures by leveraging the shape memory alloy's temperature-induced deformation, overcoming the limitations of slow transformation rates in existing technologies.
Implementation Method 1
Upon receipt of an electrical current, at least the one electrically-resistive trace configured to generate heat for deforming at least the one flap relative to the sheet
Implementation Method 2
Shape-memory alloys are special metallic materials that are capable of returning to a previously defined shape (e.g., an initial state) after being heated to deformation (e.g., a deformed state)
Data Source
AI summary
Disclosed herein is a flow control device. The flow control device comprises a sheet made from a shape memory alloy. The flow control device also comprises at least one slit through the sheet. At least the one slit defines at least one flap in the sheet. The flow control device further comprises at least one electrically-resistive trace printed on the sheet at least one of on or adjacent at least the one flap. Upon receipt of an electrical current, at least the one electrically-resistive trace configured to generate heat for deforming at least the one flap relative to the sheet and opening an aperture formed in the sheet.