Characteristics of Microscale Combustion in a Narrow Heated Channel

Maruta, Kaoru; Parc, J. K.; Oh, Kwang Chul; Fujimori, Takahiro; Minaev, Sergey; Fursenko, Roman

doi:10.1023/b:cesw.0000041403.16095.a8

Cited by 125 publications

(47 citation statements)

References 6 publications

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“…Before fuel supply, wall temperature profiles were created by using cold airflow. This approach was also employed in the series of previous studies [17][18][19][20][21]23,24]. Figure 4 shows the typical wall temperature profiles at an inlet airflow velocity of 4.0 m/s.…”

Section: Experimental Setup and Methodsmentioning

confidence: 99%

See 1 more Smart Citation

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: Experimental Setup and Methodsmentioning

confidence: 99%

“…In our group, Maruta et al [17,18] have studied the combustion behavior of premixed CH 4 / air mixtures in a heated quartz tube with a 2.0-mm diameter. In their investigations, a stable premixed flame was found to exist at high and low mixture velocities.…”

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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“…For instance, stationary and repetitive ignition-extinction flames were stabilised in both a fixed-wall-temperature configuration and without an imposed wall-temperature distribution, in methane and/or hydrogen-air mixtures for medium and low flow rates, respectively; see [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

The differential diffusion effect of the intermediate species on the stability of premixed flames propagating in microchannels

Fernández-Galisteo

Jiménez

Sánchez–Sanz

et al. 2014

Combustion Theory and Modelling

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The propagation of premixed flames in adiabatic and non-catalytic planar microchannels subject to an assisted or opposed Poiseuille flow is considered. The diffusive-thermal model and the well-known two-step chain-branching kinetics are used in order to investigate the role of the differential diffusion of the intermediate species on the spatial and temporal flame stability. This numerical study successfully compares steady-state and time-dependent computations to the linear stability analysis of the problem. Results show that for fuel Lewis numbers less than unity, Le F < 1, and at sufficiently large values of the opposed Poiseuille flow rate, symmetry-breaking bifurcation arises. It is seen that small values of the radical Lewis number, Le Z , stabilise the flame to symmetric shape solutions, but result in earlier flashback. For very lean flames, the effect of the radical on the flame stabilisation becomes less important due to the small radical concentration typically found in the reaction zone. Cellular flame structures were also identified in this regime. For Le F > 1, flames propagating in adiabatic channels suffer from oscillatory instabilities. The Poiseuille flow stabilises the flame and the effect of Le Z is opposite to that found for Le F < 1. Small values of Le Z further destabilise the flame to oscillating or pulsating instabilities.

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“…One thing should be noticed that this observed trend with regard to the stability response against the thermal conductivity seems to contradict to the well-known excess enthalpy combustion concept [e.g. [3][4][5][6][7][8][9][10][11]. There must be at least three reasons to explain; the first is to accumulate heat at the burner tip to increase the temperature to reduce the heat loss from the flame toward the burner, the second is to accumulate heat at the burner tip to enhance the reaction kernel formed at flame leading edge, and the third is to accumulate heat at the burner tip to enhance the potential chemical reaction inside the burner tube (as discussed in Sec.…”

Section: Fundamental Characteristics Of Microflames In Preheated Airmentioning

confidence: 88%

“…The channel wall plays a role of heat transfer medium for the heat recirculation in the case of the Swiss roll combustor. Recently, the fundamental characteristics of the premixed flame in a heated micro channel were studied in the context of this combustor [9][10][11], revealing that utilizing such heat recirculation is one of promising way in miniaturizing combustion devices. Interestingly, all existing combustors/burners utilizing the heat recirculation for further stabilization have been only considered in the premixed flame, although the same strategy could also be applied to the diffusion (i.e., non-premixed) flame.…”

Section: Stabilizing Technique For Small-scale Flamesmentioning

confidence: 99%

Experimental study on the unique stability mechanism via miniaturization of jet diffusion flames (microflame) by utilizing preheated air system

Fujiwara

Nakamura

2013

Combustion and Flame

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In this work, we study the near-extinction behavior of micro-jet diffusion (i.e. non-premixed) flame, so called microflame, formed in a preheated air (up to 1020 K) in order to elucidate the unique and promising stability mechanism due to miniaturization of the jet diffusion flame. Effects of fuel flow rate and preheated air temperature on overall flame shape, flame temperature and the burner tip temperature are examined experimentally. Furthermore, the slight premixing effect on the near-extinction character is also investigated in order to support the stability mechanism suggested by this study. Methane is used as fuel and the several kinds of burner material are employed in order to examine the role of the burner. It turns out that the increasing the preheated air temperature decreases the limiting minimum flow rate effectively to simulate well the ideal condition of miniaturization of jet flame. This allows the flame to stay close to the burner and suppress the heat loss to the ambient, accordingly, the burner tip is substantially heated up. Then, the fuel flowing through the burner "receives" the heat from the burner (heated by flame) effectively to enhance the reactivity, resulting in improving the stability. It is also suggested that the endothermic radical-chain reactions are promoted 2 near the exit of the burner when the burner temperature is substantially heated, at which the back-diffused oxygen is penetrated. Our experimental observations convince the existence of the unique and promising stability mechanism apparently found in the miniaturization of the jet diffusion flame, where the flame and burner scale are almost identical and their thermal interaction becomes prominent.

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Characteristics of Microscale Combustion in a Narrow Heated Channel

Cited by 125 publications

References 6 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

The differential diffusion effect of the intermediate species on the stability of premixed flames propagating in microchannels

Experimental study on the unique stability mechanism via miniaturization of jet diffusion flames (microflame) by utilizing preheated air system

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