Gas-phase entropy generation during transient methanol droplet combustion

Pope, Daniel N.; Raghavan, Vasudevan; Gogos, George

doi:10.1016/j.ijthermalsci.2010.02.012

Cited by 15 publications

(16 citation statements)

References 47 publications

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“…Although the flame temperature increases at the same time and it has an opposite effect on entropy generation as shown in Eq. (14). However, the increase magnitude of the flame temperature is smaller than the increase magnitude of chemical reaction rate.…”

Section: Entropy Generation Induced By Chemical Reactionmentioning

confidence: 92%

Entropy generation analysis of fuel lean premixed CO/H2/air flames

Jiang

Yang

Teng

2015

International Journal of Hydrogen Energy

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Section: Entropy Generation Induced By Chemical Reactionmentioning

confidence: 92%

Entropy generation analysis of fuel lean premixed CO/H2/air flames

Jiang

Yang

Teng

2015

International Journal of Hydrogen Energy

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“…Further, this study indicated that entropy generation rate decreases with increasing ambient temperature and increases with the particle diameter [30]. Gas-phase entropy generation in transient combustion of methanol droplets were examined theoretically and numerically by Pope et al [31]. Stationary droplet combustion in a low temperature nearly quiescent atmosphere and moving droplet in a preheated atmosphere were investigated [31].…”

Section: Introductionmentioning

confidence: 91%

“…Gas-phase entropy generation in transient combustion of methanol droplets were examined theoretically and numerically by Pope et al [31]. Stationary droplet combustion in a low temperature nearly quiescent atmosphere and moving droplet in a preheated atmosphere were investigated [31]. The results showed that entropy generation by chemical reaction increases and entropy generation due to heat and mass transfer reduces by increasing the initial Reynolds number [31].…”

Section: Introductionmentioning

confidence: 99%

Gas-phase transport and entropy generation during transient combustion of single biomass particle in varying oxygen and nitrogen atmospheres

Wang

Karimi

Paul

2018

International Journal of Hydrogen Energy

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Transient combustion of a single biomass particle in preheated oxygen and nitrogen atmospheres with varying concentration of oxygen is investigated numerically. The simulations are rigorously validated against the existing experimental data. The unsteady temperature and species concentration fields are calculated in the course of transient burning process and the subsequent diffusion of the combustion products into the surrounding gases. These numerical results are further post processed to reveal the temporal rates of unsteady entropy generation by chemical and transport mechanisms in the gaseous phase of the reactive system. The spatio-temporal evolutions of the temperature, major chemical species including CO, CO2, O2, H2 and H2O, and also the local entropy generations are presented. It is shown that the homogenous combustion of the products of devolatilisation process dominates the temperature and chemical species fields at low concentrations of oxygen. Yet, by oxygen enriching of the atmosphere the post-ignition heterogeneous reactions become increasingly more influential. Analysis of the total entropy generation shows that the chemical entropy is the most significant source of irreversibility and is generated chiefly by the ignition of volatiles. However, thermal entropy continues to be produced well after termination of the particle life time through diffusion of the hot gases. It also indicates that increasing the molar concentration of oxygen above 21% results in considerable increase in the chemical and thermal entropy generation. Nonetheless, further oxygen enrichment has only modest effects upon the thermodynamic irreversibilities of the system.

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“…Demirel and Sandler [106] discussed and derived the contribution to entropy generation due to this coupling: they expressed the heat flux and mass flux in a multicomponent fluid according to the Onsager formulation and retaining the contributions due to both the Dufour and Soret effects, and also proposed the use of resistance-type coefficients to express the fluxes, reformulating the entropy generation accordingly. Pope et al [107] also evaluated the entropy generation due to heat and mass transfer coupling, using a different diffusion flux formulation.…”

Section: Alternative Formulations Of Entropy Generation and Simplifyimentioning

confidence: 99%

“…Often, the reduction of entropy generation through design changes is not addressed. In the literature, several studies on local entropy generation in diffusion flames [131][132][133], non-premixed flames [134,135], and other configurations are available [136,137,107]. These investigations constitute valuable initial points for design improvement since the sources of entropy generation are quantified.…”

Section: Applications To Systems Involving Mass Transfer Chemical Rementioning

confidence: 99%