Abstract
Modeling of heat and mass transfer in liquid fuel combustion requires several material properties in a wide temperature and pressure range. The unavailable data are commonly patched with various estimation methods. In this paper, group contribution methods (GCM) and law of corresponding states (LCS) were analyzed for estimating material properties of n-alkanes (up to C10H22 and C12H26), 1-alcohols (up to C10H22O), and methyl esters (up to C19H38O2 and C19H36O2). These were compared to reference data to evaluate their applicability. LCS suggested by Poling et al. provides proper estimation for the acentric factor. GCM of Joback accurately estimates normal boiling point, critical properties, and specific heat capacity of the vapor-phase, the latter was corrected for methanol, however, GCM of Constantinou is more accurate for critical pressure of methyl esters. GCM of Ruzicka is suitable for estimating liquid-phase specific heat capacity. This method was updated for methanol. GCM of Elbro gives a proper estimation for liquid-phase density, while LCS of Lucas estimates vapor-phase viscosity properly. LCS of Chung and the modified Eucken method for vapor-phase and GCM of Sastri for liquid-phase thermal conductivity are appropriate. Considering the gas-phase mutual diffusion coefficient, the method of Fuller provides the best estimation, while LCS methods of Riedel and Chen are suitable for the enthalpy of vaporization at the normal boiling point.
Highlights
Biomass-to-fuel conversion methods have attracted numerous theoretical and practical research in the past few decades with special emphasis on the transportation sector [1, 2]
Others depend on the thermodynamic conditions, they are, e.g., specific heat capacity and thermal conductivity of both the liquid and vapor phases, liquid density, vapor viscosity, gas-phase mutual diffusion coefficient of fuel vapor and the ambient gas, and enthalpy of vaporization
law of corresponding states (LCS) suggested by Poling et al provided better estimation, as group contribution method (GCM) of Constantinou significantly underestimated ω for C1-C7 1-alcohols and slightly underestimated it for methyl esters
Summary
Biomass-to-fuel conversion methods have attracted numerous theoretical and practical research in the past few decades with special emphasis on the transportation sector [1, 2]. Others depend on the thermodynamic conditions, they are, e.g., specific heat capacity and thermal conductivity of both the liquid and vapor phases, liquid density, vapor viscosity, gas-phase mutual diffusion coefficient of fuel vapor and the ambient gas, and enthalpy of vaporization They have a significant influence on model sensitivity and validation [22]. The motivation of the present study originates from combustion, estimating methods for material properties required for heat and mass transfer calculations are emphasized. These approaches all rely on molecular theory, aiming to be as general as reasonable which does not necessarily work for all materials. This paper evaluates solely n-alkanes, 1-alcohols, and methyl esters, focusing on parameters influencing droplet evaporation
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