Flowing Suspension Stability Testing via Pump Power Monitoring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for evaluating the physical stability of dispersed particles in suspensions are unreliable, especially in dynamic flow conditions, as particle size analysis overestimates particle size and the 3-ω method only measures thermal conductivity in stationary states, failing to reflect real-world conditions.
Innovation Solution
An apparatus that recirculates a pressurized suspension stream through a sample receiving cup, using a pump and power monitor to assess stability by measuring changes in pumping power, which correlates with viscosity changes, indicating particle stability in flowing suspensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If particle size analysis is used to evaluate suspension stability, then measurement can be performed, but the measurement precision deteriorates due to overestimation of particle size and particle number
Solution Approach 1:
The patent replaces the mechanical/optical measurement system (particle size analyzer using light scattering) with a thermal field-based measurement system (3-ω method using heat conduction). By measuring thermal conductivity changes instead of direct particle properties, the system avoids the overestimation issues inherent in optical methods while providing accurate stability evaluation.
Solution Approach 2:
The patent introduces thermal conductivity as an intermediary parameter to indirectly measure particle stability. Instead of directly measuring particle size or concentration, the system measures how particle aggregation affects the suspension's thermal conductivity, providing a more accurate proxy for stability that avoids direct measurement errors.
2Temperature
If the 3-ω method is used to measure thermal conductivity, then thermal properties can be evaluated, but the application is limited to stationary states only
Solution Approach 1:
The patent transforms the static 3-ω measurement method into a dynamic version suitable for flowing suspensions. By implementing continuous circulation of the suspension through the measurement cell and maintaining steady flow conditions, the system enables thermal conductivity measurement in dynamic states while preserving measurement accuracy.
Solution Approach 2:
The patent enhances the versatility of the 3-ω method by making it applicable to both stationary and flowing suspension states. The modified apparatus can evaluate thermal properties across different flow conditions, particle concentrations, and stability states, making it a universal tool for suspension characterization.
3Ease of operation
If the suspension is kept in stationary state for measurement, then measurement conditions are simplified, but the measurement does not reflect real-world flowing conditions
Solution Approach 1:
The patent implements preliminary circulation and stabilization of the suspension flow before measurement begins. By pre-establishing steady flow conditions and allowing the system to reach equilibrium, the measurement process maintains simplicity while ensuring the suspension represents its actual flowing state during evaluation.
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
This apparatus provides a reliable method to evaluate the stability of dispersed particles in flowing suspensions by monitoring power output, effectively detecting stability degradation through changes in effective viscosity, thus overcoming the limitations of existing methods.
Implementation Method 1
A pump is in fluid communication with the sample receiving cup through the cup outlet. The pump extracts the suspension sample through the cup outlet to produce a pressurized suspension stream.
Implementation Method 2
A power monitor is in communication with the pump for monitoring the power output of the pump. An increase in power output of the pump indicates a degradation of stability of dispersed particles in the suspension sample.
Implementation Method 3
A recirculation pipe has a pipe inlet and a pipe outlet. The pipe inlet is in fluid communication with the pump for receiving the pressurized suspension stream, and the pipe outlet returns the pressurized suspension stream to the sample receiving cup
Data Source
AI summary
The apparatus for testing the stability of dispersed particles in flowing suspensions includes a sample receiving cup having a lower wall and an open upper end. A cup outlet is disposed in the lower wall, and the sample receiving cup is adapted for receiving a suspension sample through the open upper end. A pump is in fluid communication with the sample receiving cup through the cup outlet. The pump extracts the suspension sample through the cup outlet to produce a pressurized suspension stream. A recirculation pipe has a pipe inlet and a pipe outlet, the pipe inlet being in fluid communication with the pump for receiving the pressurized suspension stream, and the pipe outlet returns the pressurized suspension stream to the sample receiving cup, through the open upper end thereof. A power monitor is in communication with the pump for monitoring the power output of the pump.