Differential Pressure Flow Control for Variable-Viscosity Liquids
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Solution Overview
Problem
Existing flow controllers face challenges in accurately measuring and controlling liquid flow due to variations in fluid viscosity and density, which are influenced by temperature, pressure, and other physical parameters.
Innovation Solution
A flow controller system that receives data on temperature, differential pressure, and fluid parameters to determine a flow control setting, adjusting fluid flow and providing a negative feedback signal to continuously refine the flow measurement and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional flow measurement methods are used, then the device complexity is low, but the measurement precision deteriorates due to variations in fluid viscosity and density
Solution Approach 1:
The patent applies parameter changes by measuring multiple physical parameters (temperature, pressure, differential pressure) and using these to calculate and compensate for variations in fluid viscosity and density. The system dynamically adjusts flow measurements based on changes in these parameters, thereby maintaining high measurement precision despite variations in fluid properties without requiring complex hardware modifications
Solution Approach 2:
The system implements feedback by continuously monitoring temperature, pressure, and differential pressure, calculating the actual fluid viscosity and density, and using this information to correct and refine flow measurements. This closed-loop approach ensures measurement precision is maintained by compensating for parameter variations in real-time
2Measurement precision
If flow control adjustments are made frequently to maintain precision, then the measurement precision is improved, but the loss of time increases due to continuous data collection and adjustment cycles
Solution Approach 1:
The system performs preliminary calculations by establishing relationships between temperature, pressure, viscosity, and density before actual flow measurement. By pre-calculating compensation factors and having the computational framework ready, the system can quickly adjust to parameter changes without requiring extensive real-time computation, thereby reducing time loss while maintaining precision
3Measurement precision
If multiple sensors are added to measure temperature, pressure, and flow rate, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The system applies universality by designing a integrated control device that performs multiple functions: measuring temperature, pressure, and differential pressure; calculating fluid viscosity and density; and computing flow rates. This multi-functional approach consolidates what would otherwise require separate independent systems into a single unified device, improving measurement precision while limiting the increase in overall device complexity through functional integration
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 system achieves accurate and precise control of fluid flow by compensating for variations in viscosity and density, thereby enhancing the reliability and efficiency of fluid handling processes.
Implementation Method 1
a flow sensor providing flow rate information about the fluid flowing through the capillary in response to the differential pressure
Data Source
AI summary
A fluid system includes a capillary and a first and second temperature sensor, a first and second pressure sensor, and a processor coupled to the sensors. The processor is configured to execute instructions to determine an output using the sensor data and using fluid parameter data received via an interface coupled to the processor. The processor is coupled to a control in fluid communication with the capillary.