Advances and challenges in the development of power-generation systems at small scales

Walther, David C.; Ahn, Jeongmin

doi:10.1016/j.pecs.2010.12.002

Cited by 231 publications

(109 citation statements)

References 90 publications

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“…The ultimate goal is to develop a portable, autonomous power-generation system with an improvement in energy density over batteries. The techniques for converting fuel energy into usable energy have been grouped into four categories: micro combustors, heat engines, rockets, and fuel cells [162]. The approaches up to date have been carried out by miniaturizing the currently used large scaled devices.…”

Section: Environment and Energy Harvestingmentioning

confidence: 99%

Review on Micro- and Nanolithography Techniques and their Applications

2012

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Abstract. This article reviews major micro-and nanolithography techniques and their applications from commercial micro devices to emerging applications in nanoscale science and engineering. Micro-and nanolithography has been the key technology in manufacturing of integrated circuits and microchips in the semiconductor industry. Such a technology is also sparking revolutionizing advancements in nanotechnology. The lithography techniques including photolithography, electron beam lithography, focused ion beam lithography, soft lithography, nanoimprint lithography and scanning probe lithography are discussed. Furthermore, their applications are summarized into four major areas: electronics and microsystems, medical and biotech, optics and photonics, and environment and energy harvesting.

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Section: Environment and Energy Harvestingmentioning

confidence: 99%

Review on Micro- and Nanolithography Techniques and their Applications

2012

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“…Applications based on wireless radio-frequency identification devices (RFID) have reached a high degree of sophistication and pervasiveness, ranging from smart cards and tracking devices to advanced medical technologies. Significant issues and limitations are hitherto related to powering the RFID devices [1]. Besides the possibility of energy harvesting, e.g., via photovoltaic cells or by using the interrogation RF radiation itself, the most commonly used power sources are batteries [2,3].…”

Section: Introductionmentioning

confidence: 99%

Lithium barrier materials for on-chip Si-based microbatteries

Janski

Fugger

Forster

et al. 2017

J Mater Sci: Mater Electron

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“…The improvement of the fabrication techniques has encouraged the miniaturization of mechanical and electro-mechanical devices, following the trend previously initiated by other technological areas, such as electronics or biomechanics [1]. The primary objective of using fossil fuels to power these system is to leverage the high energy density of fuels, specifically liquid hydrocarbon fuels, relative to batteries and all other energy storage devices.…”

Section: Introductionmentioning

confidence: 99%

“…The primary objective of using fossil fuels to power these system is to leverage the high energy density of fuels, specifically liquid hydrocarbon fuels, relative to batteries and all other energy storage devices. As such, considering 45 MJ/kg as an average liquid fuel energy density, a miniaturized device with a power conversion efficiency of around 2-5% would compete with the energy density of around 2.5 MJ/kg found on the top Lithium/thionyl chloride primary batteries currently available in the market or the average 0.6 MJ/kg of an Alkaline battery [1].…”

Section: Introductionmentioning

confidence: 99%

Effect of the equivalence ratio, Damköhler number, Lewis number and heat release on the stability of laminar premixed flames in microchannels

Sánchez–Sanz

Fernández-Galisteo

Kurdyumov

2014

Combustion and Flame

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This is a postprint version of the following published document:Sánchez-Sanz, M. ; Fernández-Galisteo, D. ; Kurdyumov, V. N. Effect of the equivalence ratio, Damköhler number, Lewis number and heat release on the stability of laminar premixed flames in microchannels. Combustion and Flame, 2014, 161 (5) The effect of the equivalence ratio on the stability and dynamics of a premixed flame in a planar microchannel with a step-wise wall temperature profile is numerically investigated using the thermo-diffusive approximation. To characterize the stability behavior of the flame, we construct the stability maps delineating the regions with different flame dynamics in the inlet mass flow rate m vs. the equivalence ratio / parametric space. The flame stability is analyzed for fuels with different diffusivity by changing the Lewis numbers in the range 0:3 6 Le F 6 1:4. On the other hand, the Lewis number of the oxidizer is kept constant and equal to unity Le O ¼ 1. Our results show that, for very diffusive fuels, the stability of the flame varies significantly with the equivalence ratio, transitioning from stable flames for lean mixtures to highly unstable flames when / > 1. As the fuel Lewis number approaches unity, the stability behavior of the flame for lean and rich mixtures becomes more similar to give, in the equidiffusional case Le F ¼ 1, a symmetric stability map around the stoichiometric mixture / ¼ 1. In all cases considered, the most stable flames are always found around the stoichiometric mixtures / ¼ 1, when the flame instabilities are completely suppressed for very diffusive fuels Le F < 1, or are reduced to a narrow range of inflow velocities for fuel Lewis numbers equal or greater than unity.The ratio between the size of the channel and the flame thickness d turns out to be of great importance in the stability behavior of the flame. Keeping the rest of parameters constant, an increase in d for lean flames makes the flame considerably more unstable, confirming the findings of previous works. Nevertheless, as the stoichiometric ratio approaches / ¼ 1, that trend is reversed to give flames that become more stable as the size of the channel is increased.

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Advances and challenges in the development of power-generation systems at small scales

Cited by 231 publications

References 90 publications

Review on Micro- and Nanolithography Techniques and their Applications

Review on Micro- and Nanolithography Techniques and their Applications

Lithium barrier materials for on-chip Si-based microbatteries

Effect of the equivalence ratio, Damköhler number, Lewis number and heat release on the stability of laminar premixed flames in microchannels

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