Journal ArticleDOI
Combustion of a Fuel Droplet in a Mixed Convective Environment
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In this article, the authors simulated the combustion of a fuel droplet in a mixed convective environment both theoretically and experimentally, subject to the assumptions of constant properties (except for density) and infinite rate kinetics.Abstract:
The combustion of a fuel droplet in a mixed convective environment has been simulated both theoretically and experimentally. In the theoretical model, the flow and transport equations have been solved subject to the assumptions of constant properties (except for density) and infinite rate kinetics, using the finite element method. The gas density has been treated as a variable, only to determine the buoyancy force contribution, and it has been evaluated assuming an ideal gas mixture. A porous-sphere facility has been employed for simulating the burning characteristics of a fuel droplet experimentally. The effects of airflow rate and droplet size have been studied for both upward and downward airflow configurations. Theoretical predictions for the mass burning rate and flame shape are in excellent agreement with the experimental results of the present study and also those reported in the literature. For upward airflow configuration, the mass burning rate is under-predicted by 15 to 20 percent when...read more
Citations
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Disruptive burning of precursor/solvent droplets in flame‐spray synthesis of nanoparticles
TL;DR: In this paper, the combustion characteristics of isolated micron-sized precursor/solvent droplets are investigated experimentally, and the mechanism of disruptive droplet burning is similar to that of slurry droplets, consisting of three main steps: (1) diffusion-controlled burning of the highvolatile solvent, (2) viscous-shell formation due to decomposition of the low-volatile metal precursor, and (3) subsequent disruption due to heterogeneous nucleation.
Journal ArticleDOI
Experimental investigation of burning rates of pure ethanol and ethanol blended fuels
Shintre Parag,Vasudevan Raghavan +1 more
TL;DR: In this paper, a fundamental experimental study to determine the burning rates of ethanol and ethanol-blended fossil fuels is presented, where pure liquid ethanol or its blends with liquid fossil fuels such as gasoline or diesel, has been transpired to the surface a porous sphere using an infusion pump.
Journal ArticleDOI
Flame shapes and burning rates of spherical fuel particles in a mixed convective environment
TL;DR: In this paper, experimental and numerical investigations of spheres burning in a convective environment have been carried out using a finite volume technique based on non-orthogonal semi-collocated grids.
Journal ArticleDOI
Investigation of droplet combustion in strained counterflow diffusion flames using planar laser-induced fluorescence
TL;DR: In this paper, an isolated droplet burning in a convective flow is reported, where HO radical and acetone droplets are injected in a steady laminar diffusion counterflow flame operating with methane.
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Entropy generation during the quasi-steady burning of spherical fuel particles
TL;DR: In this paper, the entropy generation rate in the range of subcritical freestream velocity, where an envelope flame is present, presents a minimum value and reaches a maximum value at a critical velocity where the flame transition occurs.
References
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Journal ArticleDOI
A detailed study of burning fuel droplets
Harry A. Dwyer,Billy R. Sanders +1 more
TL;DR: In this paper, a finite-difference solution to the full set of conservation equations in two space dimensions provides droplet vaporization rates, drag coefficients, Nusselt numbers and flame structures over a range of Reynolds and Damkohler numbers.
Journal ArticleDOI
Asymptotic analysis with reduced chemistry for the burning of n-heptane droplets
J.M. Card,Forman A. Williams +1 more
TL;DR: In this article, the authors used rate-ratio asymptotics to analyze the flame structure and extinction of an isolated n-heptane droplet burning under quasisteady, spherically symmetrical conditions.
Journal ArticleDOI
Combustion of single drops of fuel
Herman Krier,J. A. Wronkiewicz +1 more
TL;DR: In this article, an experimental study of the flame zone development about a spherical hydrocarbon fuel droplet burning in air has provided data which is compared to present quasisteady theories which predict mass-burning rates and flame-zone locations as a function of droplet size.
Journal ArticleDOI
Study on the Burning of a Fuel Drop in Heated and Pressurized Air Stream : 1st Report, Experiment
Hiroshi Sami,Mitsunobu Ogasawara +1 more
TL;DR: In this paper, the burning characteristics of a fuel drop in heated and pressurized air stream were studied experimentally, and the results concerning the influence of temperature and pressure are as follows: when the temperature is raised, the flame becomes long and the soot formation increases.