Rotating Electrode Assembly for Fluid Streaming Potential Measurement
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Solution Overview
Problem
Existing devices for determining fluid streaming potential are limited in their applicability, particularly for non-aqueous solutions like hydraulic fluid, as they often require chloride ions or are cumbersome and prone to leaking, making them unsuitable for measuring streaming potentials in organic fluids.
Innovation Solution
A system and method using a rotating device with a ring-disk electrode assembly, separated by an insulative gap, which measures voltage differences at various rotation rates to determine streaming potential in fluids, allowing for the selection of fluids with lower streaming potentials for use in hydraulic systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If small silver chloride reference electrodes are used to measure streaming potential, then measurement precision is improved, but adaptability deteriorates because the device is limited to aqueous solutions containing chloride ions
Solution Approach 1:
The patent uses non-aqueous reference electrodes (such as Ag/Ag+ in non-aqueous electrolyte or pseudo-reference electrodes) that can function in both aqueous and non-aqueous solutions, making the streaming potential measurement device universally applicable to different fluid types including hydraulic fluids, organic solvents, and aqueous solutions
2Measurement precision
If two small silver chloride electrodes in a flow cell are used, then streaming potential can be measured, but device complexity increases and reliability deteriorates due to being cumbersome and prone to leaking
Solution Approach 1:
The patent segments the measurement system into a rotating electrode assembly that can be easily assembled and disassembled, with separate compartments for different electrodes and electrolyte reservoirs. This modular design reduces leakage points and simplifies maintenance while maintaining measurement capability
Solution Approach 2:
The patent introduces non-aqueous reference electrodes as intermediaries that eliminate the need for chloride ion-dependent silver chloride electrodes, allowing measurement in hydraulic fluids and organic solvents without requiring complex flow cell assemblies, thereby reducing leakage risks
3Measurement precision
If a flow cell with pumped fluid is used, then streaming potential measurement is achieved, but device complexity and pressure requirements increase
Solution Approach 1:
The patent employs a rotating electrode assembly where the electrode itself rotates to create fluid flow across the measurement interface. This dynamic approach eliminates the need for external pumps and complex flow cell structures, reducing device complexity while maintaining the ability to measure streaming potential across a range of flow conditions
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 accurate measurement of streaming potential in a variety of fluids, including non-aqueous solutions, with a compact and efficient setup that can identify fluids less prone to contamination or corrosion, facilitating their use in hydraulic systems.
Implementation Method 1
A rotating device is rotated in a fluid to cause the fluid to move across the rotating device
Implementation Method 2
A voltage of the fluid is measured at a plurality of locations of the rotating device as the fluid moves across the rotating device. A streaming potential of the fluid is determined based on a difference in the measured voltage of the fluid at the plurality of the locations of the rotating device
Data Source
AI summary
A method (e.g., for characterizing a fluid) includes rotating an electrode assembly in a fluid at a rotation speed. The electrode assembly includes first and second electrodes. Rotation of the electrode assembly draws at least a portion of the fluid to move across the first and second electrodes. The method also includes measuring a potential difference between the first and second electrodes as the at least a portion of the fluid moves across the first and second electrodes due to rotation of the electrode assembly, and determining a streaming potential of the fluid using the potential difference.