Publication: Flow characteristics and heat transfer enhancement of synthetic jet impinging on heated plate
| datacite.subject.fos | oecd::Engineering and technology::Mechanical engineering | |
| dc.contributor.author | Azmi Bin Husin | |
| dc.date.accessioned | 2025-05-19T02:25:59Z | |
| dc.date.available | 2025-05-19T02:25:59Z | |
| dc.date.issued | 2023-02-01 | |
| dc.description.abstract | Downsizing electronic components while increasing their performance will increase heat generation exponentially. The excessive heat produced in electronic components can cause premature failure. Hence, maintaining the operating temperature at optimal conditions becomes more challenging. A synthetic jet is one of the under-developing forced cooling systems. The capability to produce continuous high fluid flow without additional fluid supply systems, high reliability and simple construction are the synthetic jet device's main advantages to be considered as a future active cooling system. The present research work was focused on enhancing the flow and the heat transfer rate by synthetic jet. The effect of the straight, nozzle and diffuser-shaped orifices were studied to see the flow characteristic of the speaker-driven synthetic jet. Additionally, the exit velocity was investigated to see the opening angle effect of the diffuser-shaped orifice. Then, the cooling performance of synthetic jet impinges on a flat heated surface was further investigated in the numerical work. Moreover, the effect of various heat source inputs, the gap between the orifice to the cooling surface, the opening angle of the diffuser shape orifice and the speaker’s diaphragm amplitude were extensively studied. The flow and heat transfer characteristics of the synthetic jet were numerically simulated using commercial computational fluid dynamic software. A three-dimension model with a moving boundary method was developed to achieve the objective of the current study. The flow is assumed to be incompressible and turbulent. The Unsteady Reynolds-averaged Navier-Stokes equations with Shear Stress Transport k-ω model are chosen to solve the governing equations for the synthetic jet flow. The user-defined functions that represent the movement of the speaker's diaphragm were utilized to increase the accuracy of the numerical model. In the flow study, the numerical model successfully captured the streamline of the synthetic jet flow generated by the speaker actuator. The ejection centreline velocity from the diffuser shape orifices was higher than straight and nozzle shape orifices. The most significant change in centreline velocity was observed when the opening angle switched from 0o to 30o. The maximum acceptable opening angle was 60o because the change of the centreline velocity at the opening angle of 90o and 120o were almost insignificant. The location of vortex formation near the centreline of the orifice help to increase the velocity during the ejection of the synthetic jet. In the heat transfer study, the distance between the orifice and the heated surface has significant heat transfer characteristics. The smaller gap (H=10mm) is suitable for centred or point cooling while the greater gap (H=30mm) shows a more uniform temperature distribution on the heated surface. Considering the opening angle of the diffuser shape orifice with suitable speaker diaphragm amplitude improved the cooling performance of the speaker-driven synthetic jet impinging on the flat heated surface. The heat transfer performance for the opening angle of 90o is better than 45o at a higher diaphragm amplitude. | |
| dc.identifier.uri | https://erepo.usm.my/handle/123456789/21678 | |
| dc.language.iso | en | |
| dc.title | Flow characteristics and heat transfer enhancement of synthetic jet impinging on heated plate | |
| dc.type | Resource Types::text::thesis::doctoral thesis | |
| dspace.entity.type | Publication | |
| oairecerif.author.affiliation | Universiti Sains Malaysia |