C3F7H (FM-200) has recently been introduced as an alternative for Halon 1301 (CF3Br) fire suppression agent. In this paper, as part of an effort to study the effects of C3F7H on high temperature ignition of gaseous fuels, we are expanding on our earlier evaluations of ignition inhibition characteristics of C3F7H. Of particular interest is a better or improved understanding of the fundamental me...

nanocrystalline zro2 with particle size of about 38 nm was directly synthesized by sol-gel auto-combustion method. the overall process involved three steps: formation of homogeneous sol at 50-55°c; formation of dried gel at 110°c, and combustion of the dried gel at 400°c. experiments revealed that zro2 dried gel derived from glycine (fuel) and nitrate sol exhibited self propagating combustion a...

Coal is a combustible material applicable to a variety of oxidation scenarios with conditions ranging from atmospheric temperature to ignition temperature. One of the most frequent and serious causes of coal fires is self-heating or spontaneous combustion. Opening an underground coal seam to mine ventilation air, such as long-wall gob and goaf areas and coal stockpiles, creates a risk of sponta...

We present a heat release dynamics model which utilizes a well-stirred reactor (WSR) model and one-step kinetics to describe the unsteady combustion process. The model incorporates the linearized mass and energy equations to describe the response of the reactor to external perturbations, and is cast in the form of a first order filter. The model is able to predict the phase between the mass flo...

Thermogravimetric analysis was used to examine the thermal behavior of dairy manure as a pyrolysis and combustion feedstock. Nitrogen and air were used as purging gases to analyze the pyrolysis and combustion reactions, respectively, and heating rates of 20 o C min -1 , 40 o C min -1 and 60 o C min -1 were applied. An Arrhenius model was used to estimate the kinetic parameters (activation energ...

Three-dimensional n-heptane spray flames in a swirl combustor are investigated by means of direct numerical simulation (DNS) to provide insight into realistic spray evaporation and combustion as well as relevant modeling issues. The variable-density, low-Mach number Navier–Stokes equations are solved using a fully conservative and kinetic energy conserving finite difference scheme in cylindrica...

In this paper, a computational in-cylinder analysis of HCCI diesel engine was carried out using IC Engine FORTE (ANSYS 18.2) software package. The analysis used pre-defined industry standard CHEMKIN format for specifying a chemical reaction mechanism during the combustion duration. The investigation was carried out for the effects of various EGR mass percentages on the thermal and emission char...

In this work, a model for the nitrogen chemistry in the oxy-fuel combustion of pulverized coal has been developed. The model is a chemical reaction engineering type of model with a detailed reaction mechanism for the gas-phase chemistry, together with a simplified description of the mixing of flows, heating and devolatilization of particles, and gas solid reactions. The model is validated by co...

203 Marco J. Castaldi is an Assistant Professor in the Earth & Environmental Engineering Department at Columbia University. He received his B.S. ChE from Manhattan College and M.S. and Ph.D. ChE from the University of California, Los Angeles. Prior to joining Columbia University, he worked in industry for 7 years researching and developing novel catalytic reactors. His teaching interests lie in...

The small radiant heaters that burn hydrocarbon fuels propane, butane, methane/natural gas and liquid hydrocarbon fuels are used widely because of their simple design, their portability, and the ready availability of fuels. The open flame heater presents obvious disadvantages as follows. An upset heater is a grave fire risk where the surroundings are flammable and this restricts usage in, for e...