We have proposed a novel model of self-interstitial defect in crystalline Si. It contains four Si interstitials and has the structural features as follows: All silicon atoms are coordinated, contrast to previously models; is characterized by five-, six-, seven-membered atomic rings. The total energy, relaxed configuration, electronic structure been determined using transferable semiempirical tight binding method.

Spontaneous emission spectroscopy has been applied to measure the time-resolved temperature profiles of gaseous fuel flames using high and low oxygen concentration combustion air. Two peaks C2 radical species have observed at visible wavelengths from propane-air flames. The ratio these two depends on flame temperature. relationship between ratios was correlated with thermocouple output a premixed flat burner multichannel CCD spectrometer. Using this relationship, determined peaks....

A cryogenic radiometer has been revised and examined in order to improve the absolute measurement of soft X‐ray intensities. The uncertainty temperature rise cavity absorber decreased 0.2 % through an increase thermal responsivity suppression fluctuation back ground temperature.

ABSTRACT The objective of this work has been to basically elucidate the drying characteristics an optically semitransparent material by combined radiative and convective heating. experiments were conducted for a graphite suspension, slurry surplus activated sludge wet silica sand. time-change rate as well surface temperature brimfully layer measured under step heating conditions using infrared lamp bundle blast hot air heated electric heater. experimental data obtained show satisfactory...

A numerical simulation of a coaxial jet diffusion e ame with steam addition was performed by using an overall one-step chemical reaction. The effect on the combustion characteristics, especially effects method decrease in temperature, examined. results assist better understanding theeffectsofsteam additiononNO x reductionincoaxialjetdiffusione ame.Thee amestructureand are found to be similar countere ow ame, simulated meansof detailed elementary kinetics. applicability thelaminare...

A high-speed video camera was combined with a newly developed optical system to measure time resolved two-dimensional (2D) temperature distribution in flames. This diagnostics has been applied the an industrial size regenerative test furnace facility using highly preheated combustion air and heavy fuel oil. The 2D distributions of continuum emission from soot particles these flames have simultaneously measured at two discrete wave bands 125 frames/sec. allowed us determine each image on...

The use of high temperature and low oxygen concentration air as the oxidizer for regenerative combustion has become increasing interest because this technology results in higher thermal efficiency, energy consumption, reduced emission pollutants, such NOx CO2, compact size equipment. In study information is provided on effect preheating formation detection chemical ions neutral species formed flames. These were detected directly using mass spectrometry. Such also assists determining...

This paper proposes, describes, and analyses a novel high temperature performance reheat gas turbine (GT) cogeneration system. newly proposed system employing two-stage fuel-rich fuel-lean combustion is named as the ‘Fuel Rich-Lean Combustion Reheat GT Cogeneration System’ (RLCC). Energy exergy (the latter mainly to evaluate demonstrate reduction in loss of this process compared with conventional single-stage fuel lean-lean combustion) were performed The RLCC predicted have an overall power...

ABSTRACT A mathematical model for the drying rate of granular particles in a multistage inclined fluidized bed(IFB) is presented from standpoint simultaneous heat and mass transfer, with taking effect mechanical vibration added vertically into consideration. Steady-state distributions temperatures concentrations heating gas, moisture content are numerically calculated based on present model. The results show fairly good agreement experimental data, which were obtained experiments brick...

Knowledge on the local value of reducing and oxidizing (redox) atmospheres in flames is among most important issues to be desired by combustion engineers. In this study, spatial distribution a redox atmosphere has been measured experimentally chemical seeding/laser-induced fluorescence (CS/LIF) technique. A solution iron was sprayed into premixed propane-air flame supported slot burner. The LIF intensity FeO band compared that Fe line estimate determined degree atomization reaction FeO→Fe+O....

A spectroscopic method has been applied to measure two-dimensional temperature distribution in luminous spray flames. test furnace, incorporating a pair of regenerative burners, was used examine the behavior heavyfuel oil flames with very high-temperature combustion air. The here is based on two-color thermometry, which ratio spectral intensities continuum emission taken at two closely located wavelengths. flame temperatures obtained by use charge-coupled device camera fitted an optical...

An experimental burner of the heat-recirculating type was constructed and its thermal characteristics were investigated for methane-air fuel-lean combustion. Longitudinal temperature distributions air burned gas flowing in passes determined by means both measurements numerical simulations. Using heat recirculation rate efficiency as criteria transfer performance burner, optimal design examined terms a chemical parameter (the equivalence ratio), fluid-mechanical Reynolds number), two...