Enhanced heat transfer in air cooled heat sinks using aeroelastically fluttering reeds

Hidalgo, Pablo; Jha, Sourabh; Glezer, Ari

doi:10.1109/therminic.2015.7389627

Cited by 12 publications

(8 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The stability of an elastic member within a channel, or as part of the channel, has been studied for many decades (Johansson, 1959;Miller, 1960;Inada & Hayama, 1988, 1990Nagakura & Kaneko, 1991). Applications include wind instruments (Sommerfeldt & Strong, 1988;Backus, 1963), human snoring (Balint & Lucey, 2005;Tetlow & Lucey, 2009), vocalization (Tian et al, 2014), and enhanced heat transfer (Shoele & Mittal, 2016;Hidalgo et al, 2015). Recently, this geometry has also been used for flow-energy harvesting, with devices specifically targeting power generation for remote sensor networks (Sherrit et al, 2014(Sherrit et al, , 2015Lee et al, 2015Lee et al, , 2016.…”

Section: Introductionmentioning

confidence: 99%

Modeling and simulation of a fluttering cantilever in channel flow

Tosi

Colonius

2019

Journal of Fluids and Structures

View full text Add to dashboard Cite

Characterizing the dynamics of a cantilever in channel flow is relevant to applications ranging from snoring to energy harvesting. Aeroelastic flutter induces large oscillating amplitudes and sharp changes with frequency that impact the operation of these systems. The fluid-structure mechanisms that drive flutter can vary as the system parameters change, with the stability boundary becoming especially sensitive to the channel height and Reynolds number, especially when either or both are small. In this paper, we develop a coupled fluid-structure model for viscous, two-dimensional channel flow of arbitrary shape. Its flutter boundary is then compared to results of two-dimensional direct numerical simulations to explore the model's validity. Provided the non-dimensional channel height remains small, the analysis shows that the model is not only able to replicate DNS results within the parametric limits that ensure the underlying assumptions are met, but also over a wider range of Reynolds numbers and fluid-structure mass ratios. Model predictions also converge toward an inviscid model for the same geometry as Reynolds number increases.

show abstract

Section: Introductionmentioning

confidence: 99%

Modeling and simulation of a fluttering cantilever in channel flow

Tosi

Colonius

2019

Journal of Fluids and Structures

View full text Add to dashboard Cite

show abstract

“…However, few experimental investigations were conducted on FSI coupled with convective heat transfer [14]. Herrault et al [15] and Hidalgo et al [16][17] reported beneficial effects on heat transfer by inserting elastic fluttering reeds in heatsink fins, which are driven by the air flow. The experimental results reported by Hidalgo et al [16], demonstrated a coefficient of performance enhancement of about 2.4-fold with a reduction in flow velocity of 50% and an increase of about 190% in Nusselt number relative to the base flow in single channel testbed.…”

Section: Introductionmentioning

confidence: 99%

“…Herrault et al [15] and Hidalgo et al [16][17] reported beneficial effects on heat transfer by inserting elastic fluttering reeds in heatsink fins, which are driven by the air flow. The experimental results reported by Hidalgo et al [16], demonstrated a coefficient of performance enhancement of about 2.4-fold with a reduction in flow velocity of 50% and an increase of about 190% in Nusselt number relative to the base flow in single channel testbed. However, for the tests conducted in a 5-channel heatsink, the heat transfer enhancement in Nusselt number varies between a minimum of 53% and a maximum of 69% at lower Reynolds number ranges.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Air Side Heat Transfer Enhancement with Self Agitators

Chen

2017

47th AIAA Fluid Dynamics Conference

View full text Add to dashboard Cite

show abstract

“…However, they require an additional power supply system to drive the structural oscillation, limiting the range of practical applications. Passive FSI vortex generators for heat transfer enhancement [12][13][14][15][16] have also been investigated. However, a method to improve the vortex field has not yet been identified.…”

mentioning

confidence: 99%

Bio-inspired self-agitator for convective heat transfer enhancement

et al. 2018

Applied Physics Letters

View full text Add to dashboard Cite

Convective heat transfer plays an important role in both the fundamental research and the development of high-performance heat exchangers. Inspired by blades of grass vibrating in the wind, we developed a self-agitator for convective heat transfer enhancement. Because of fluidstructure interactions, the agitator, with self-sustained vibration, can generate strong vortices to significantly break the thermal boundary layer and improve fluid mixing for enhanced convective heat transfer. In particular, we establish a methodology to link the vorticity field at a preferred frequency to the optimal improvement in the convective heat transfer. To identify the self-agitator preferred frequency, mode analysis is performed with simulation results using dynamic mode decomposition. Experimental results are also obtained to further validate the proposed approach. These results show that the proposed self-agitator design can improve the convective heat transfer by 120% in a conventional heat exchanger without additional pumping power requirements and can achieve a Nusselt number of up to 30 within the laminar flow region, which is improved by 200% with the same Reynolds number compared to the clean channel.

show abstract

Enhanced heat transfer in air cooled heat sinks using aeroelastically fluttering reeds

Cited by 12 publications

References 14 publications

Modeling and simulation of a fluttering cantilever in channel flow

Modeling and simulation of a fluttering cantilever in channel flow

Air Side Heat Transfer Enhancement with Self Agitators

Bio-inspired self-agitator for convective heat transfer enhancement

Contact Info

Product

Resources

About