Experimental Investigation of Vortex Induced Vibration Piezoelectric Energy Harvester using Dimpled Structure / (Record no. 614607)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 02693nam a22001577a 4500 |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 621 |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Mir Afzal, |
| 245 ## - TITLE STATEMENT | |
| Title | Experimental Investigation of Vortex Induced Vibration Piezoelectric Energy Harvester using Dimpled Structure / |
| Statement of responsibility, etc. | Mir Afzal |
| 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 | 74p. |
| Other physical details | Soft Copy |
| Dimensions | 30cm |
| 500 ## - GENERAL NOTE | |
| General note | The growing demand for sustainable energy solutions for autonomous IoT sensors and<br/>remote monitoring devices has driven interest in piezoelectric energy harvesting from<br/>ambient fluid flows. This study investigates wake-induced vibrations from PVDF<br/>piezoelectric flags positioned behind dimpled circular cylinders compared to smooth<br/>baseline configurations. Comprehensive water tunnel experiments tested a 25 mm<br/>diameter cylinder at flow velocities of 0.15-0.30 m/s (Reynolds numbers 3500-11500).<br/>Nine dimpled configurations were evaluated, featuring three dimple diameters (9, 11, and<br/>13mm) arranged in 3, 4, and 5 columns. Flag was positioned at streamwise gaps of 1D3D downstream. Data acquisition included real-time measurements of voltage, high<br/>velocity analysis of video, and Particle Image Velocimetry (PIV) for wake<br/>characterization. Smooth circular cylinders significantly outperformed all dimpled<br/>configurations and achieved peak power output of 15.2 μW at 2D spacing and 0.30 m/s,<br/>maintaining optimal wake width. Performance degraded systematically among dimpled<br/>configurations: 3-column arrangements outperformed 4-column designs, which exceeded<br/>5-column configurations, while smaller dimples consistently outperformed larger ones.<br/>The best dimpled cylinder (3-column, 9mm dimples) achieved only 91.45% of smooth<br/>cylinder performance, while the worst configuration (5-column, 13mm dimples)<br/>delivered merely 59.41% of baseline output. PIV analysis revealed dimple-induced<br/>boundary layer energization promotes premature flow reattachment, reducing wake width<br/>and vortex formation length, thus diminishing downstream energy availability. Optimal<br/>energy harvesting occurs at 1.5D-2.5D spacing, peaking at 2D regardless of<br/>configuration. These findings provide critical design guidance for marine sensors,<br/>structural health monitoring, and autonomous underwater vehicles, demonstrating that<br/>smooth cylinders optimize VIV energy harvesting. This research advances understanding<br/>of fluid-structure interactions in energy harvesting and provides practical guidelines for<br/>sustainable micro-power generation systems. |
| 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. EMAD UD DIN |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | <a href="http://10.250.8.41:8080/xmlui/handle/123456789/54443">http://10.250.8.41:8080/xmlui/handle/123456789/54443</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 | 09/01/2025 | 621 | SMME-TH-1147 | Thesis |