Journal ArticleDOI
Millimeter-scale liquid metal droplet thermal switch
Tianyu Yang,Beomjin Kwon,Patricia B. Weisensee,Jin Gu Kang,Xuejiao Li,Paul V. Braun,Nenad Miljkovic,Nenad Miljkovic,William P. King +8 more
TLDR
In this paper, the authors present a millimeter-scale thermal switch with a switching ratio of 70 at heat fluxes near 10 W/cm2, which is capable of modulating between high and low thermal conductances, enabling the partitioning and active control of heat flow pathways.Abstract:
Devices capable of actively controlling heat flow have been desired by the thermal management community for decades. The need for thermal control has become particularly urgent with power densification resulting in devices with localized heat fluxes as high as 1 kW/cm2. Thermal switches, capable of modulating between high and low thermal conductances, enable the partitioning and active control of heat flow pathways. This paper reports a millimeter-scale thermal switch with a switching ratio >70, at heat fluxes near 10 W/cm2. The device consists of a silicone channel filled with a reducing liquid or vapor and an immersed liquid metal Galinstan slug. Galinstan has a relatively high thermal conductivity (≈16.5 W/mK at room temperature), and its position can be manipulated within the fluid channel, using either hydrostatic pressure or electric fields. When Galinstan bridges the hot and cold reservoirs (the “ON” state), heat flows across the channel. When the hot and cold reservoirs are instead filled with the...read more
Citations
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Journal ArticleDOI
Thermal control elements for caloric energy conversion
Katja Klinar,Andrej Kitanovski +1 more
TL;DR: In this article, thermal switches, thermal diodes and thermal regulators have been used to control the heat flux on different size and time scales in caloric devices, which can improve the power density of caloric devices.
Journal ArticleDOI
Electric Actuation of Liquid Metal Droplets in Acidified Aqueous Electrolyte
TL;DR: In acidified electrolyte in the presence of surface-active anions, the electrically actuated motion of LM can be realized and the actuation of Galinstan achieves a higher average and maximum speed at lower applied voltage and power consumption for acidified KI electrolyte.
Journal ArticleDOI
Electric-Field-Controlled Thermal Switch in Ferroelectric Materials Using First-Principles Calculations and Domain-Wall Engineering
TL;DR: In this paper, the thermal conductivity of PbTiO was studied as a function of electric field and the results emphasize the need for large-domain samples and lower temperatures to have the best chance at large voltage-controlled thermal switching in this class of materials.
Journal ArticleDOI
Are Contact Angle Measurements Useful for Oxide-Coated Liquid Metals?
Ishan D. Joshipura,Ishan D. Joshipura,K. Alex Persson,Vi Khanh Truong,Vi Khanh Truong,Ji-Hyun Oh,Minsik Kong,Man Hou Vong,Chujun Ni,Mohanad Alsafatwi,Dishit P. Parekh,Hong Zhao,Michael D. Dickey +12 more
TL;DR: In this paper, the authors show that the advancing angle for gallium-based liquid metals is always high (>140°), even on substrates to which it adheres, because the solid native oxide must rupture in tension to advance the contact line.
Journal ArticleDOI
Wide range continuously tunable and fast thermal switching based on compressible graphene composite foams.
Tingting Du,Tingting Du,Zixin Xiong,Luis Delgado,Weizhi Liao,Joseph Peoples,Rajath Kantharaj,Prabudhya Roy Chowdhury,Amy Marconnet,Xiulin Ruan +9 more
TL;DR: A continuously tunable, wide-range, and fast thermal switching approach is proposed and demonstrated using compressible graphene composite foams and large (~8x) continuous tuning of the thermal resistance is achieved from the uncompressed to the fully compressed state.
References
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Journal ArticleDOI
Colloquium : Phononics: Manipulating heat flow with electronic analogs and beyond
TL;DR: In this article, a toolkit of familiar electronic analogs for use of phononics is put forward, i.e., phononic devices are described which act as thermal diodes, thermal transistors, thermal logic gates, and thermal memories.
Journal ArticleDOI
Transient cooling of electronics using phase change material (PCM)-based heat sinks
TL;DR: In this article, the use of phase change material (PCM)-based heat sink in transient thermal management of plastic quad flat package (QFP) electronic devices was investigated experimentally and numerically.
Journal ArticleDOI
Liquid metal enabled microfluidics
Khashayar Khoshmanesh,Shi-Yang Tang,Jiu Yang Zhu,Samira Schaefer,Arnan Mitchell,Kourosh Kalantar-zadeh,Michael D. Dickey +6 more
TL;DR: Liquid metal enabled microfluidic components are discussed, and their desirable attributes are highlighted including simple fabrication, facile integration, stretchability, reconfigurability, and low power consumption, with promising applications for highly integrated microfluidity systems.
Journal ArticleDOI
Searching for a Better Thermal Battery
TL;DR: Progress in materials science, chemistry, and engineering may lead to dramatic breakthroughs in thermal energy storage that could improve the efficiency with which the authors produce, distribute, and consume energy.
Journal ArticleDOI
Planar jumping-drop thermal diodes
TL;DR: In this article, a planar phase-change diode scalable to large areas with an orientation-independent diodicity of over 100 was proposed, in which water/vapor is enclosed by parallel super-hydrophobic and superhydrophilic plates.