Dynamic Contact Angle Detection for Gas Purification Membranes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for testing the contact angle of gas purification membranes are static and cannot measure the impact of filtration parameters like filtration rate on the membrane's hydrophobic and oleophobic properties, leading to incomplete data on membrane performance during gas filtration.
Innovation Solution
A dynamic detection system comprising a light source, gas purification membrane stage, imaging system, computer, and supporting platform, which includes a gas flow controller, differential pressure sensor, and desiccant to measure the contact angle of gas purification membranes under varying filtration rates, allowing for dynamic data collection of contact angles and differential pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a static contact angle test device and method is used, then the contact angle measurement is simple and straightforward, but it is impossible to obtain contact angle data and the impact of filtration parameters such as filtration rate on the contact angle in the gas filtration state
Solution Approach 1:
The patent transforms the static contact angle measurement into a dynamic measurement system that can capture contact angle changes under varying filtration rates. The gas purification membrane stage allows gas flow through the membrane while the imaging system continuously captures droplet images, enabling dynamic observation of contact angle changes during actual filtration operations rather than under static conditions.
Solution Approach 2:
The detection system integrates multiple functions into a unified platform: the gas purification membrane stage serves both as a filtration device and a measurement platform; the imaging system captures both contact angle data and filtration process information; the system simultaneously measures contact angle, gas flux, and differential pressure, eliminating the need for separate static contact angle testing and filtration testing.
2Productivity
If the gas purification membrane is operated at higher filtration rates, then the gas flux and productivity are improved, but the contact angle may change and the membrane becomes more susceptible to water and oil contamination
Solution Approach 1:
The system establishes a feedback mechanism by continuously monitoring contact angle changes at different filtration rates. The imaging system captures droplet images at various gas flux levels, and the contact angle calculation reveals how hydrophobicity changes with operating conditions. This feedback enables optimization of filtration rate selection to maintain both productivity and contamination resistance.
Solution Approach 2:
The patent systematically varies the filtration rate parameter to observe its effect on contact angle. By conducting measurements at multiple gas flux levels (different filtration rates), the study identifies the relationship between operating parameters and membrane hydrophobicity, enabling selection of optimal operation parameters that balance productivity and contamination resistance.
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 the measurement of contact angles and differential pressures at different filtration rates, providing comprehensive data on membrane performance and enhancing the understanding of hydrophobic and oleophobic properties under dynamic conditions.
Implementation Method 1
the induced draft fan provides negative pressure through the gas outlet of the gas membrane purification stage. Gas permeates the gas purification membrane under the action of the differential pressure
Implementation Method 2
Gas permeates the gas purification membrane under the action of the differential pressure; the differential pressure sensor detects the differential pressure between the two sides of the gas purification membrane
Implementation Method 3
the desiccant filled in the lower part of the separation net can absorb the water vapor permeating the gas purification membrane, so as to prevent an error in the measurement of the gas quantity
Implementation Method 4
the imaging system photographs the state of the droplet on the surface of the gas purification membrane at different permeation speeds
Data Source
Figure 1~2
Figure 3~5
Figure 6
AI summary
The invention discloses a dynamic detection system and method for the contact angle of a gas purification membrane, wherein the dynamic detection system for the contact angle of the gas purification membrane includes a light source, a gas purification membrane stage, an imaging system, a computer, and a supporting platform; the light source, the gas purification membrane stage, and the imaging system are linearly fixed on the supporting platform, and the imaging system is connected to the computer; The gas purification membrane stage includes a loose flange, an upper fixed flange, a separation net, a cylinder, a gas outlet, a desiccant, a lower fixed flange, a blind plate, a gas flow controller, a buffer tank, an induced draft fan, and a differential pressure sensor. The detection system can measure the contact angle of the membrane surface in the state of gas filtration and complete the dynamic detection of the contact angle of the gas purification membrane.