The role of structural heat exchange and heat loss in the design of efficient silicon micro-combustors

Leach, Timothy T.; Cadou, Christopher P.

doi:10.1016/j.proci.2004.08.229

Cited by 123 publications

(54 citation statements)

References 15 publications

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“…However, the increased heat loss due to large surface area-to-volume ratio [3,4] and the wall radical quenching [4] make it difficult to achieve a stable and efficient combustion under reduced scales. Therefore, thermal management, for instance, heat recirculation [5], is frequently adopted in the design of microscale combustors [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigations of flame pattern formations in a radial microchannel

Fan

Minaev

Sereshchenko

et al. 2009

Proceedings of the Combustion Institute

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigations of flame pattern formations in a radial microchannel

Fan

Minaev

Sereshchenko

et al. 2009

Proceedings of the Combustion Institute

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“…Thus, when a small combustion device surrounded by cold air is considered, loss of the combustion heat generated shall be enhanced toward the ambient, resulting that the system could become unstable (e.g., combustion is difficult to continue). This kind of heat loss effect sounds negative for a flame stabilization purpose, however, such Nakamura, Gao and Matsuoka, Journal of Thermal Science and Technology, Vol.12, No.1 (2017) enhancement of the heat transfer can be "recirculated" by adopting the heat exchanger surrounded by the combustor, as indicated by Leach and Cadou (2005). They have proven that axial heat transfer widens stability limits, increases the burning rate, and thus can enable the construction of smaller, higher power density combustors.…”

Section: Premixed Combustion 321 Heat Recirculation-assisted (Excesmentioning

confidence: 99%

Progress in small-scale combustion

Nakamura

Gao

Matsuoka

2017

JTST

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This article briefly reviews the recent works related to small-scale combustion and its potential impact into combustion science and engineering is presented. Followed by a simple description of the scale effect on combustion to highlight its "unique" feature, past related works are then summarized. The impact of heat recirculation appearing in combustion systems, which is the most prominent feature of a micro-or small-scale combustion system, is focused upon and is understood that exactly the same strategy promising better combustion performance is confirmed irrespective of flame type (either premixed or non-premixed). With respect to this, paying attention to the entire combustor design, to optimize within the target working range is a crucial matter when micro-scale combustion is adopted. Potential subjects to be covered to further promote these aspects in this field are then presented.

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“…This phenomena may occur due to several reasons such as heat loss variations, heat transfer from post-flame to pre-flame zone (Hua et al, 2005;Leach and Cadou, 2005), the increment of reactive mixture residence time (Norton and Vlachos, 2003) and enhancement of mixing process, respectively. Also, some chemical and physical properties of the micro-combustor wall and the inlet mixture such as fuel type (Norton and Vlachos, 2003), wall thermal conductivity (Baigmohammadi et al, 2013;Vlachos, 2003, 2004;Raimondeau et al, 2002;Rana et al, 2014;Veeraragavan and Cadou, 2011;Zarvandi et al, 2012;Zhou et al, 2009), equivalence ratio and inlet velocity can influence combustion process in micro-combustors.…”

Section: Frontiers In Heat and Mass Transfermentioning

confidence: 99%

“…Many experimental and numerical investigations which have been conducted are concentrated on the effects of some crucial options such as micro-tube/channel geometry Kim and Maruta, 2006;, heat loss (Hua et al, 2005;, thermal and radical quenching , fluid flow characteristic and equivalence ratio (Hua et al, 2005;Zhang et al, 2007), and pre-heating of fresh entrance reactive mixture (Hua et al, 2005;Ju and Choi, 2003;Leach and Cadou, 2005;Norton and Vlachos, 2003;Raimondeau et al, 2002) on combustion phenomena in micro-combustors. As results of many investigations, it can be inferred that the micro-combustor…”

Section: Introductionmentioning

confidence: 99%

Effect of Wall Thermal Conductivity on Hydrogen-Assisted Catalytic Ignition Characteristics of Propane-Air at Micro-Scales in Different Feeding Modes

Chen¹,

Gao²,

Xu³

2015

Frontiers in Heat and Mass Transfer

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Effect of wall thermal conductivity on hydrogen self-ignition and hydrogen-assisted ignition of propane-air mixtures in different feeding modes from ambient cold-start conditions were investigated numerically with chemical kinetic model in Pt/γ-Al2O3 catalytic micro-combustors. For the steady and transient state, effect of wall thermal conductivity on self-ignition characteristics of lean hydrogen-air mixtures was presented, and hydrogenassisted combustion of propane-air mixtures was investigated numerically in the co-feed mode and the sequential feed mode. The computational results indicate the large thermal inertia of the micro-combustor solid structure leads to slow temperature dynamics, and transient response is dominated by the thermal inertia. The heat localization in poorly conducting walls leads to fast ignition and shorter steady state time. In general, the concentration of hydrogen required for propane ignition increased with increasing wall thermal conductivity, decreasing inlet velocity, and decreasing inlet equivalence ratio of propane-air mixtures. In the co-feed mode, the combustion characteristics of hydrogen-assisted propane qualitatively resemble the selectively preheating initial portion of the combustion chamber wall. In the sequential feed mode, the time taken to reach steady state, the hydrogen cut-off time, the propane ignition time and the cumulative propane emissions increased with increasing wall thermal conductivity; the ignition characteristics are similar to partially preheating the initial segment for low and moderate wall thermal conductivity values (0.5 and 20 W/m· K); however, the ignition characteristics are close to completely heating the micro-combustor wall for high wall thermal conductivity values (200 W/m· K).

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The role of structural heat exchange and heat loss in the design of efficient silicon micro-combustors

Cited by 123 publications

References 15 publications

Experimental and numerical investigations of flame pattern formations in a radial microchannel

Experimental and numerical investigations of flame pattern formations in a radial microchannel

Progress in small-scale combustion

Effect of Wall Thermal Conductivity on Hydrogen-Assisted Catalytic Ignition Characteristics of Propane-Air at Micro-Scales in Different Feeding Modes

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