Results 111 to 120 of about 58,602 (164)

Structure of Micro (Millimeter Size) Diffusion Flames

2008
Tiny jet diffusion flames (called “micro flames” hereafter) with hydrocarbon fuels were established over a submillimeter-diameter hypodermic needle in a quiescent atmosphere. Because of the small flame height, on the order of magnitude of one millimeter, there is hardly any buoyancy effect, and the observed flame shape is almost spherical when Re=O(1).
Yuji Nakamura, Heng Ban, Kozo Saito, Tadao Takeno   +3 more
openaire   +1 more source

Structure and Dynamics of Laminar Jet Micro-Slot Diffusion Flames

Journal of Heat Transfer, 2002
Results of an experimental investigation into the behavior of laminar jet diffusion flames, produced using micro-slot burner ports, are presented. Under certain conditions, the cross-sectional shape of micro-slot flames is qualitatively similar to the cross-sectional shape of circular burner port flames produced in an environment where molecular ...
John Baker, Mark E. Calvert, David W. Murphy   +2 more
openaire   +1 more source

Experimental characterization of a laminar diffusion flame in micro-gravity

Journal de Chimie Physique et de Physico-Chimie Biologique, 1999
L'etude experimentale d'une flamme de diffusion etablie sur une plaque de PMMA de 50 mm x 50 mm x 10 mm, placee dans un ecoulement force parallele a la surface a ete realisee. Les experiences ont ete principalement realisees dans un environnement de microgravite pour simuler les conditions a bord d'un vaisseau spatial en orbite.
T. Vietoris, P. Joulain, J. L. Torero
openaire   +1 more source

Active control of lifted diffusion flames with arrayed micro actuators

Experiments in Fluids, 2005
Active control of a lifted flame issued from a coaxial nozzle is investigated. Arrayed micro flap actuators are employed to introduce disturbances locally into the initial shear layer. Shedding of large-scale vortex rings is modified with the flap motion, and the flame characteristics such as liftoff height, blowoff limit, and emission trend, are ...
N. Kurimoto, Y. Suzuki, N. Kasagi
openaire   +1 more source

Oscillatory extinction of spherical diffusion flames: Micro-buoyancy experiment and computation

Proceedings of the Combustion Institute, 2002
The transient extinction behavior of near-limit spherical diffusion flames under microbuoyancy conditions was experimentally investigated. An inverse flame configuration was employed with the oxidizer being ejected from a porous sphere burner into a fuel (H 2 ) environment in a low-pressure (0.096 atm) chamber to effectively minimize buoyancy.
S.W. Yoo, E.W. Christiansen, C.K. Law
openaire   +1 more source

A numerical study on extinction behaviour of laminar micro-diffusion flames

Combustion Theory and Modelling, 2006
We conducted a numerical study on the fluid dynamic, thermal and chemical structures of laminar methane–air micro flames established under quiescent atmospheric conditions. The micro flame is defined as a flame on the order of one millimetre or less established at the exit of a vertically-aligned straight tube.
Y. Nakamura, H. Yamashita, K. Saito
openaire   +1 more source

Experimental Studies of the Micro-Structures of Opposed Flow Diffusion Flames: Methane

Combustion Science and Technology, 1997
Abstract The micro-structure of an atmospheric pressure, opposed flow, methane diffusion flame has been studied using heated micro-probe sampling. Mole fraction profiles of major products as well as trace aromatic, substituted aromatic, and polycyclic aromatic hydrocarbons (PAH up to C16H10, e.g., pyrene)were quantified by direct gas chromatography ...
ANTONIO M. VINCITORE, SELIM M. SENKAN
openaire   +1 more source

Appearances of internal micro bubbling, multiple micro explosions, multiple micro jets and micro diffusion flames around an abruptly heated micro plastic-resin particle

Proceedings of the Combustion Institute, 2007
Abstract Heating, gasifying and burning processes of a micro plastic-resin particle, which has a diameter of about 200 μm and is suddenly exposed to a hot oxidizing atmosphere, are observed and optically processed by combining a micro schlieren system with a high-speed CCD video camera.
Yojiro Ishino, Ryuji Yamakita, Norio Ohiwa   +2 more
openaire   +1 more source

On micro-buoyancy spherical diffusion flames and a double luminous zone structure of the hydrogen/methane flame

Symposium (International) on Combustion, 1998
Almost spherically symmetry diffusion flames of substantial dimension (diameter ∼ several centimeters) were established in earth gravity by ejecting an O 2 /N 2 mixture from a porous sphere into a subatmospheric pressure environment consisting of low-molecular-weight fuels such as methane and hydrogen.
C.J. Sung, D.L. Zhu, C.K. Law
openaire   +1 more source

Numerical investigations on the methane-oxygen diffusion flame-street phenomena in a microchannel: Effects of wall temperatures, inflow rates and global equivalence ratios on flame behaviors and combustion performances

, 2020
“Flame-street” is an exotic diffusion flame behavior characterized by the peculiar formation of intermittent reaction-zones in the mixing layer of fuel and oxidizer streams in a micro-channel.
Bo Sun, Xin Kang, Yu Wang
semanticscholar   +1 more source