The dependence of some thermodynamic properties of spin-polarized liquid 3He such as velocity of sound, adiabatic index, isentropic compressibility and temperature on the spin polarization has been investigated along different isentropic paths. The Lennard-Jones potential has been used in our calculations. It has been found that for higher values of entropy, the spin polarization has greate...

Experimental data were acquired for: (1) the ignition temperatures of nitrogen–diluted ethylene and propylene by counterflowing heated air for various strain rates and system pressures up to 7 atm; (2) the laminar flame speeds of mixtures of air with acetylene, ethylene, ethane, propylene, and propane, deduced from an outwardly propagating spherical flame in a constant-pressure chamber, for ext...

Laser-induced fluorescence and excitation spectra of formaldehyde in the A-X 4(1)(0) band at 370 nm are recorded in the primary flame front of a Bunsen flame. An examination of partition functions shows that this excitation can minimize temperature bias for formaldehyde in situ diagnostic measurements.

Simultaneous measurements with the TwoColor emission and Laser-Induced-Incandescence techniques on a diffusion laminar LPG bunsen flame were performed. The acquired images were filtered, perspective corrected and processed via an on purpose made procedure in order to reduce the measuring error. For quantitative measurements of the soot volume fraction and temperature a tungsten lamp calibration...

OF THE THESIS RESIDENCE-TIME-FIXED INVESTIGATION OF PRESSURE AND TEMPERATURE EFFECTS ON THE FLAME SYNTHESIS OF NANOPARTICLES

The heat capacities of synthetic pyrope (Mg,Al,Si,O,,), grossular (CasAI,SisO12), and a solid solution pyrope,,grossular,, (Mg,,sCa,,,Al,Si,O,,) have been measured by adiabatic calorimetry in the temperature range l&350 K. The samples were crystallized from glasses in a conventional pistoncylinder apparatus. The molar thermophysical properties at 298.15 K (J mol’ K‘) are: c; So298 % H’h, &P Pyr...

Superhorizon perturbations induce large-scale temperature anisotropies in the cosmic microwave background (CMB) via the Grishchuk-Zel’dovich effect. We analyze the CMB temperature anisotropies generated by a single-mode adiabatic superhorizon perturbation. We show that an adiabatic superhorizon perturbation in a CDM universe does not generate a CMB temperature dipole, and we derive constraints ...

The asymptotic structure of laminar, moderately rich, premixed methane flames is analyzed using a reduced chemical-kinetic mechanism comprising four global reactions. This reduced mechanism is different from those employed in previous asymptotic analyses of stoichiometric and lean flames, because a steady-state approximation is not introduced for CH3. The aim of the present analysis is to devel...

The excess enthalpy flames and their dynamics below the flammability limit are studied by considering two flames that propagate in opposite directions in parallel channels. The model enables the coupling between the external heat loss, convection preheating, diffusion transport and finite rate chemistry. Analytical expressions for the flame temperature, separation distance, and extinction limit...

In experiments of hot surface ignition and subsequent flame propagation, a puffing flame instability is observed in mixtures that are stagnant and premixed prior to ignition. By varying the size of the hot surface, power input, and combustion vessel volume, it was determined that the instability is a function of the interaction of the flame, with the fluid flow induced by the combustion product...