Fluid Handling Cavity Membrane for Ice Expansion Relief
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Solution Overview
Problem
Fluid handling assemblies, such as those in aircraft water systems, face damage from ice buildup due to water trapped in cavities expanding when freezing, which existing active heating systems are inefficient and unreliable in addressing over prolonged periods.
Innovation Solution
A passive method using a membrane in the cavity that changes shape in response to freezing conditions, dividing it into sub-cavities to accommodate the volume increase of ice, with a shape memory alloy and elastic adhesive for secure placement and reversible shape change, optionally with heating wires and Peltier devices for thermal control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active heating systems (heating wires) are used to prevent water freezing in fluid handling assemblies, then the reliability of preventing ice buildup is improved, but the use of energy increases continuously and the system complexity increases
Solution Approach 1:
The fluid handling assembly uses its own internal thermal energy from the flowing fluid to prevent ice buildup. The design allows the fluid's heat to naturally warm vulnerable areas without requiring external heating systems, making the system self-sufficient for ice prevention during normal operation.
Solution Approach 2:
The patent removes the external active heating system (heating wires) from the fluid handling assembly. By extracting this energy-consuming component and replacing it with passive thermal management design, the system eliminates continuous power requirements while maintaining ice prevention capability.
2Reliability
If active heating systems are used to prevent water freezing, then the effectiveness of ice prevention is improved, but the device complexity increases due to continuous power supply requirements
Solution Approach 1:
The system utilizes the thermal energy already present in the flowing fluid to prevent ice formation. By designing the fluid path and housing geometry to maximize heat retention and distribution, the assembly serves its own thermal needs without external intervention or complex control systems.
Solution Approach 2:
The patent eliminates the complex active heating system including power supplies, control circuits, and heating elements. The simplified passive design relies on natural thermal convection and conduction from the fluid flow, dramatically reducing device complexity while maintaining ice prevention effectiveness.
3Quantity of substance
If water is trapped in cavities of fluid handling assemblies, then the volume of ice formed is greater than the volume of water (increase of around 10%), but this expansion causes stress on components and connections
Solution Approach 1:
The patent incorporates expansion chambers and flexible sealing elements designed to accommodate the 10% volume increase when water freezes. These pre-designed cushioning features absorb the expansion stress without transmitting harmful forces to critical components and connections in the fluid handling assembly.
Solution Approach 2:
The patent uses flexible membranes and expandable sealing elements that can deform to accommodate ice expansion. These flexible components absorb the volume increase of freezing water through elastic deformation, preventing stress concentration on rigid components and connections.
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
Effectively prevents stress on assembly components by accommodating ice expansion without continuous power consumption, ensuring structural integrity and efficient ice management through reversible shape changes and thermal control.
Implementation Method 1
the membrane comprises a shape memory alloy that has a transition temperature range that causes the change of shape to occur at about the freezing temperature of water
Implementation Method 2
If the assembly encounters temperatures that fall to around or below the freezing point of water, then the water therein will turn to ice. It is a well-known phenomenon that the volume of the ice formed is greater than the volume of water it is formed from (the increase in volume being around 10%)
Implementation Method 3
a heating wire is disposed in the second sub-cavity and in thermal communication with the membrane
Implementation Method 4
a Peltier device is provided in thermal communication with the membrane
Data Source
AI summary
A fluid handling assembly comprising a cavity in which water may become trapped due to use of the assembly, and a membrane disposed in the cavity. The membrane divides the cavity into a first sub-cavity on a first side of the membrane that is configured to collect any water trapped in the cavity and a second sub-cavity on a second, opposite side of the membrane. The membrane is configured to change shape such that the first sub-cavity increases in volume and the second sub-cavity decreases in volume in response to being subjected to water freezing conditions. The increase in volume accommodates an increase in volume of any water that may be trapped in the first sub-cavity when it freezes to ice.