Bio-inspired self-agitator for convective heat transfer enhancement

Li, Zheng; Xu, Xianchen; Li, Kuojiang; Chen, Yangyang; Ke, Zhaoqing; Wang, Sheng; Chen, Hsiu-Hung; Huang, Guoliang; Chen, Chung-Lung; Chen, Chien-Hua

doi:10.1063/1.5046502

Title: Bio-inspired self-agitator for convective heat transfer enhancement

Journal Article · Thu Sep 13 00:00:00 EDT 2018 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.5046502· OSTI ID:1470782

Li, Zheng; Xu, Xianchen;

; Chen, Yangyang; Ke, Zhaoqing;

; Chen, Hsiu-Hung; Huang, Guoliang; Chen, Chung-Lung; Chen, Chien-Hua

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 fluid-structure 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.

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Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AR0000582

OSTI ID:: 1470782

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Vol. 113 Journal Issue: 11; ISSN 0003-6951

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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