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“…Heat loss is found to amplify the diffusive-thermal instability for Le F < 1, as demonstrated in a Hele-Shaw configuration [13,14], for example, can also drive the flame to oscillate [15,16]. These unsteady solutions were found when increasing the duct size in the case of isothermal walls for Le F < 1 [8]; however, they only appear in the adiabatic-wall cases for Le F > 1, as shown later in the present work.…”
Section: Introductionmentioning
“…For Le > 1, oscillatory symmetric and non-symmetric solutions can appear. This was shown for both adiabatic channels [10,13,14,19] and channels with heat losses through the wall [9,10]. Of course this is an effect of thermo diffusive instabilities that dominate in narrow channels.…”
Section: Introductionmentioning
“…After pioneering work in the subject of flames propagating in ducts several years Email address: Corresponding author: carmen.jimenez@ciemat.es (Carmen Jiménez) ago [4,5], the interest in small-scale combustion systems has revived the studies on the effects of the channel flow rate [6,7], heat-losses [8,9], the Lewis number [10][11][12][13][14] and thermal expansion [15][16][17][18][19] on the flame propagation in narrow channels.…”
Section: Introductionmentioning
“…Some studies [74] were carried out with adiabatic walls that removed the gas-solid heat transfer. However, the heat losses from the microcombustor surface do play an important role in flame behaviours as mentioned earlier [125,142]. Singh et al [143] recently studied the effect of wall thermal boundary conditions on flame dynamics.…”
Section: Introductionmentioning
“…This energy can be harnessed via combustion in the form of heat and converted to useful power. In order to achieve this, combustion in a narrow passage where the characteristic dimension is of the order of the flame thickness has received considerable attention in the past two decades and is termed microscale (dimension <1mm) or mesoscale (dimension close to flame thickness) combustion [5,46,66,67,70,73,91,106,[123][124][125]. The potential applications include portable power systems and propulsion systems for small scale rockets [4].…”
Section: Introductionmentioning