These household cookstove models are organized around the three major zones of the cookstove system: the fuel bed, the gas phase reaction zone, and the heat transfer zone.
Today's household biomass cookstove models are coupled steady-state models with simplified algebraic relationships for the packed bed; computational fluid dynamics with a four-equation set global reaction scheme for CO2, CO, H2, H2O, and hydrocarbons in the gas phase reaction zone; and generic correlations or computational fluid dynamics models in the heat transfer zone.
By using LIF technique for measuring the relative population of different vibrational levels, we were able to calculate the vibrational temperature in the gas phase reaction zone in front of the sample at subignition to approximately 3100 K.
The spatial profiles in steady state show that H2 and CO are formed in presence of gas phase oxygen (oxidation zone) and after total oxygen conversion by steam reforming (reforming zone).
Optimized parameters for coating were derived from the simulation of gas phase dynamics in both zone of CVD reactor.
While this simplification is appropriate to simulate transport in the saturated zone, it can result in significant errors when modeling gas phase transport in the vadose zone, as might be applied when simulating a soil vapor extraction (SVE) system to remediate vadose zone contamination.
Our complete model uses two mobile zones, one for the liquid phase and one for the gas phase, with dispersion in each zone and mutual mass transfer.
Risk assessments of sites contaminated with organic contaminants are typically conducted using models that ignore gas phase transport in the unsaturated zone.
The modelling approach consists of the computation of macroscopic gas phase transport phenomena in the process zone e.g. flow, heat and mass transfer, including thin film deposition on hot surfaces.
In contrast, when the oxygen concentration was larger than the pyrolysis oxidizing gas, the ignition gas phase reaction occurred in the diffusion zone of the propellant pyrolysis products and the environment gas, the initial flame appeared far from the propellant surface.
