Endwall effects on 3D flow around a piezoelectric fan

Oh, Myong Hun; Seo, Junhyuk; Kim, Yonghwan; Choi, Minsuk

doi:10.1016/j.euromechflu.2018.10.021

Cited by 18 publications

(5 citation statements)

References 24 publications

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“…2009; Dehdari Ebrahimi, Eldredge & Ju 2019; Oh et al. 2019), biomimetic propulsion systems (e.g. Kopman & Porfiri 2013; Yeh & Alexeev 2014; Shintake et al.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic forces acting on the elliptic cylinder performing high-frequency low-amplitude multi-harmonic oscillations in a viscous fluid

2021

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“…2009; Dehdari Ebrahimi, Eldredge & Ju 2019; Oh et al. 2019), biomimetic propulsion systems (e.g. Kopman & Porfiri 2013; Yeh & Alexeev 2014; Shintake et al.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic forces acting on the elliptic cylinder performing high-frequency low-amplitude multi-harmonic oscillations in a viscous fluid

2021

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“…It is illustrated that the streaming flow induced by a piezoelectric fan possesses vortical feature and the attainable flow rate is tightly dependent on the vibration parameters (such as vibration frequency, amplitude and mode shape), [7][8][9][10] its geometric parameters 8,[11][12][13] and operating environment. [14][15][16][17][18] Of particular is that the transient 3-D vortex structures emanated from the trailing and side edges and the process of breakdown have been fully captured by Ebrahimi et al 19 and Oh et al 20 On account of its pseudo-jet impingement role, plenty of investigations have also been made to the reveal the heat transfer performance of piezoelectric fan. [21][22][23][24][25][26] Extensive literature research suggests that most of the studies on air cooling technology using piezoelectric fans are focused on heat dissipation surfaces with simple structure.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the characteristics of turbulent flow and heat transfer induced by a vibrating piezoelectric fan on asymmetrical concave surfaces

Chen

2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper aims at performing an investigation numerically on the turbulent flow and thermal performances for an asymmetrical concave surface integrated with a slim vibrating piezoelectric fan. The dynamic mesh technique using a user defined function to describe the displacement function of vibrating cantilever beam is employed to model the deformation of the slim piezoelectric fan in time. Meanwhile, the SST k-ω turbulence model is chosen to capture the turbulence behavior of the flow and heat transfer. Two important factors, the relative curvature of the both sides of semicircular surfaces ( RK) and the dimensionless distance of fan offset along y-axis (Δ y/ APP) are taken into considerations during the simulation process. A considerable increase of local time-average heat transfer coefficients is observed in the vicinity of vibration envelope. The results show that the relative curvature ( RK) has a strong influence on the flow and heat transfer at both ends of the asymmetrical concave surface when its value is larger than 2. And by adjusting the dimensionless offset distance of the piezoelectric fan (Δ y/ APP), the area-averaged convective heat transfer coefficient can be increased by 20% on a small zone surrounding the fan with WPF × App (S1). The conclusions of this paper implement a theoretical attempt for expanding the application scenarios of piezoelectric fan.

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“…Undoubtedly, the piezoelectric cooling fan is a good cooling solution for many electronic products. Recently, detail researches have been finished by using the fluid mechanics and flow analysis [7][8][9]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

“…In Ref. [9], it was found that the propagation of the side vortex is a key factor in determination of the flow pattern. Based on the numerical results, it was found that whether the side vortex propagates or not is an important factor in determining three-dimensional flow pattern around the piezoelectric fan [9].…”

Section: Introductionmentioning

confidence: 99%

Vibration and cooling performances of piezoelectric cooling fan: numerical and experimental investigations

Liu

Chen

et al. 2020

MATEC Web Conf.

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In this paper, the vibration and cooling performances of the piezoelectric cooling fan are studied. The finite element and experimental methods are adopted for the analyses. The natural frequency, mode shape, flapping amplitude, and cooling performance are discussed for the primary design. The numerical results have good agreement with the experimental measurements. For the cooling purpose, the piezoelectric cooling fan has to work under the natural frequency. The aspect ratio 2:3 is the optimal geometry of the fan blade.

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Endwall effects on 3D flow around a piezoelectric fan

Cited by 18 publications

References 24 publications

Hydrodynamic forces acting on the elliptic cylinder performing high-frequency low-amplitude multi-harmonic oscillations in a viscous fluid

Hydrodynamic forces acting on the elliptic cylinder performing high-frequency low-amplitude multi-harmonic oscillations in a viscous fluid

Investigation of the characteristics of turbulent flow and heat transfer induced by a vibrating piezoelectric fan on asymmetrical concave surfaces

Vibration and cooling performances of piezoelectric cooling fan: numerical and experimental investigations

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