Microplastic Behavior in Idealistic Exhalation Dynamics: Exploring Shape, Density, and Diameter Effects Using CFD / (Record no. 615225)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 02814nam a22001577a 4500 |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 621 |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Siddiqui, Hadia Alam |
| 245 ## - TITLE STATEMENT | |
| Title | Microplastic Behavior in Idealistic Exhalation Dynamics: Exploring Shape, Density, and Diameter Effects Using CFD / |
| Statement of responsibility, etc. | Hadia Alam Siddiqui |
| 264 ## - PRODUCTION, PUBLICATION, DISTRIBUTION, MANUFACTURE, AND COPYRIGHT NOTICE | |
| Place of production, publication, distribution, manufacture | Islamabad : |
| Name of producer, publisher, distributor, manufacturer | SMME- NUST; |
| Date of production, publication, distribution, manufacture, or copyright notice | 2025. |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 60p. |
| Other physical details | Soft Copy |
| Dimensions | 30cm |
| 500 ## - GENERAL NOTE | |
| General note | Microplastics are now ubiquitous contaminants in the atmosphere which have raised<br/>substantial public health issues. While extensive research has focused on particle<br/>deposition during inhalation, the exhalation phase, a critical component of the<br/>complete respiratory cycle, remains comparatively less explored. The study aims at<br/>addressing this research gap by conducting a comprehensive computational<br/>investigation into the deposition dynamics of microplastic particles during exhalation<br/>within an idealized human tracheobronchial airway model from generations G3โG6.<br/>A three-dimensional airway geometry was constructed via Weibel's morphometric<br/>data, adjusted for a 50-year-old adult. Computational Fluid Dynamics (CFD)<br/>simulations are performed using the Reynolds-Averaged Navier-Stokes (RANS)<br/>approach with the (SST) ๐-๐ turbulence model. The Discrete Phase Model (DPM)<br/>was employed to track trajectories of spherical microplastic particles 2-22 ยตm under<br/>four exhalation flow rates 125, 300, 500, and 1000 ml/s, representing varying<br/>breathing intensities from resting to heavy exercise. The results demonstrate an<br/>inverse relationship between exhalation flow rate and overall deposition efficiency<br/>(DE). Lower flow rates resulted in the highest DE, as particles had greater residence<br/>time for gravitational sedimentation and were less influenced by turbulent dispersion.<br/>In contrast, higher flow rates generated significant turbulent kinetic energy, which<br/>enhanced particle mixing and reduced net deposition. Furthermore, deposition was<br/>strongly governed by inertial impaction, as evidenced by a positive correlation with<br/>the Stokes number. Spatial analysis revealed that while high flow rates created intense<br/>deposition hotspots at major bifurcations, the cumulative particle deposition isXIV<br/>significantly lower than at gentler flow rates, where deposition is more widespread.<br/>This study concludes that gentle exhalation poses a greater risk for microplastic<br/>retention in the lower bronchial airways. The findings challenge the assumption that<br/>higher airflow invariably leads to increased deposition and provide crucial insights<br/>into the mechanisms of particle exposure during the exhalation phase. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | MS Mechanical Engineering |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Supervisor : Dr. Ammar Tariq |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | <a href="http://10.250.8.41:8080/xmlui/handle/123456789/55981">http://10.250.8.41:8080/xmlui/handle/123456789/55981</a> |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | |
| Koha item type | Thesis |
| Withdrawn status | Permanent Location | Current Location | Shelving location | Date acquired | Full call number | Barcode | Koha item type |
|---|---|---|---|---|---|---|---|
| School of Mechanical & Manufacturing Engineering (SMME) | School of Mechanical & Manufacturing Engineering (SMME) | E-Books | 10/27/2025 | 621 | SMME-TH-1192 | Thesis |