Publications by authors named "B Pourdeyhimi"
Article Synopsis
- Electret filters, made from electrostatically charged bipolar fibers, are studied in a new computational model focusing on how droplet deposition affects their aerosol capture efficiency.
- Simulations used ANSYS CFD with custom enhancements to examine droplet properties like surface tension and electrical conductivity, finding that conductivity and permittivity significantly reduce fiber effectiveness due to charge neutralization and shielding.
- The research provides important insights into the functionality of electret filters and their implications for industrial and environmental uses.
Adaptable Intelligent Filters of Dual Thermo- and pH- Responsive Filter Material.
Macromol Rapid Commun
November 2024
Article Synopsis
- This study presents the creation of new filter materials that respond to both pH and temperature changes, utilizing polymers PNIPAM and PAA.
- PNIPAM provides temperature sensitivity, while PAA is responsible for pH responsiveness, allowing these materials to change their properties in response to environmental conditions.
- The dual-responsive filters can adjust their hydrophilicity, pore size, and permeability, enhancing their filtration efficiency and effectiveness at capturing contaminants while minimizing fouling.
Clean up following the wide-area release of a persistent biological agent has the potential to generate significant waste. Waste containing residual levels of biological contaminants may require off-site shipment under the U.S.
View Article and Find Full Text PDFElectrostatic charge is a major part of modern-day aerosol filtration media (e.g., N95 respirators and surgical facemasks) that has remained poorly understood due to its complicated physics.
View Article and Find Full Text PDFArticle Synopsis
- The study focuses on annular melt blowing, a process for creating fibers by using high-velocity air to shape molten polymer into thin jets.
- A new multiphase computational fluid dynamics (CFD) model was developed to explore the interactions between polymer and air and how they affect fiber characteristics, particularly whipping instability and fiber diameter.
- Results showed that differences in velocity between the polymer and air influenced instability, while fiber diameter was mainly affected by polymer throughput and air velocity; the model predictions matched well with experimental data, especially at lower air velocities.