U-bend Multiphase Flow Measurement via Differential Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Characterizing the flow of multiphase fluids is challenging due to their non-homogenous nature and complex flow characteristics, which can depend on various factors such as operating conditions, composition, and physical characteristics of the conduit.
Innovation Solution
A system is described that includes a U-bend configuration with multiple conduits and differential pressure sensors to measure the flow rates of multiphase fluids. The system uses equations based on differential pressure measurements and mixture density to determine the total flow rate of the multiphase fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional flow metering methods are used for multiphase fluids, then measurement can be performed, but accuracy is compromised due to non-homogenous flow characteristics and complex flow regimes
Solution Approach 1:
The system segments the multiphase flow measurement into multiple independent measurement paths (first conduit and second conduit through the U-bend). By measuring differential pressure across each bend separately and combining the results, the system overcomes the difficulty of measuring non-homogenous multiphase flow with a single sensor, improving measurement accuracy while addressing the complex flow characteristics
Solution Approach 2:
The U-bend configuration acts as an intermediary element that transforms the complex multiphase flow into measurable differential pressure signals. The bends convert kinetic energy and flow direction changes into pressure differences that can be accurately measured, serving as a mediator between the difficult-to-measure multiphase flow and the pressure sensors
2Difficulty of detecting and measuring
If hazardous energy sources are used for flow measurement, then measurement capability is achieved, but safety risks are introduced
Solution Approach 1:
The system replaces hazardous energy sources (such as radioactive isotopes or high-energy acoustic sources) with a purely mechanical measurement approach using differential pressure sensors across the U-bend. This mechanical substitution eliminates safety hazards while maintaining measurement capability, as the pressure sensors passively detect flow characteristics without introducing harmful energy into the multiphase stream
3Device complexity
If simple pressure measurement is used, then device complexity is reduced, but measurement accuracy deteriorates due to frictional and shear pressure losses
Solution Approach 1:
The system applies local quality by placing differential pressure sensors at specific locations across the U-bend bends where flow characteristics are most indicative of total flow rate. By strategically positioning sensors to capture pressure differences primarily due to flow direction changes rather than frictional losses, the system maintains measurement precision while keeping the device relatively simple
Solution Approach 2:
The U-bend configuration introduces asymmetry in the flow path, creating distinct pressure differential patterns that can be used to calculate total flow rate. The asymmetric geometry of the bends ensures that pressure differences are primarily function of flow velocity and direction rather than frictional losses, improving precision without requiring complex compensation mechanisms
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 effectively measures the total flow rate and phase flow rates of multiphase fluids, even in complex flow regimes, without relying on hazardous energy sources, and takes into account frictional and shear pressure losses.
Implementation Method 1
A first differential pressure sensor is coupled to the third conduit and to the first conduit. The first differential pressure sensor is configured to measure a first differential pressure of the multiphase fluid across the first bend.
Implementation Method 2
takes into account frictional and shear pressure losses
Implementation Method 3
takes into account frictional and shear pressure losses
Data Source
AI summary
A multiphase fluid is flowed from a flow pipe to a U-bend. Several differential pressures of the multiphase fluid flowing through the flow pipe and U-bend are measured. A total flow rate of the multiphase fluid is determined at least based on the measured differential pressures. In some cases, flow rates of each of the phases of the multiphase fluid can be determined at least based on the measured differential pressures.