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Flow control by circular cavities in lateral flow porous membranes
Syed Rehman Jamil1, Muhammad Salman Abbasi1, Ali Turab Jafry2
1Faculty of Mechanical Engineering, University of Engineering and Technology, Lahore, Pakistan.
Science Progress
|March 1, 2024
Summary
Controlling liquid flow in microfluidic paper-based analytical devices (μPADs) is key. Adding cavities to paper channels significantly alters flow rates, enabling better control for diagnostics and monitoring.
Area of Science:
- Biomedical Engineering
- Materials Science
- Fluid Dynamics
Background:
- Microfluidic paper-based analytical devices (μPADs) are crucial for diagnostics, food quality, and environmental monitoring.
- Controlling liquid flow rate in μPADs is essential for accurate results.
- Capillary action and porous media properties influence liquid movement.
Purpose of the Study:
- To investigate geometric control of liquid imbibition rates in μPADs.
- To understand how flow resistance and membrane geometry affect capillary penetration.
- To develop enhanced flow control strategies for μPAD applications.
Main Methods:
- Conducted experiments and computational fluid dynamics (CFD) simulations.
- Altered flow resistance by changing liquids (viscosity) and paper channel geometry (adding cavities).
- Examined the impact of cavity size, type, and position on imbibition rates.
Main Results:
- Creating circular cavities in paper channels significantly altered penetration rates.
- Increased cavity size and liquid viscosity decreased flow rate.
- Cavity position influenced imbibition rates; maximum delay observed with a 16 mm cavity.
- Castor oil showed an 85-fold slower flow rate compared to water.
Conclusions:
- Geometric modifications, specifically adding cavities, offer effective control over liquid flow in μPADs.
- This research provides insights for developing advanced flow control strategies in μPADs.
- Findings support the advancement of μPADs for diverse analytical applications.
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