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Michael C. Hicks
Glenn Research Center
41Publications
7H-index
257Citations
Publications 41
Newest
Published on Mar 1, 2019in Journal of Supercritical Fluids 3.12
Michael C. Hicks7
Estimated H-index: 7
(Glenn Research Center),
Uday G. Hegde3
Estimated H-index: 3
(Case Western Reserve University),
J.J. Kojima
Abstract Results on the autoignition and stabilization of ethanol hydrothermal flames in a Supercritical Water Oxidation (SCWO) reactor operating at constant pressure are reported. The flames are observed as luminous reaction zones occurring in supercritical water; i.e., water at conditions above its critical point (approximately 22 MPa and 374 °C). A co-flow injector is used to inject fuel (inner flow), comprising an aqueous solution ranging from 20%-v to 50%-v ethanol, and air (annular flow) i...
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Published on Jan 1, 2018in Siam Journal on Applied Mathematics 1.70
Peter V. Gordon7
Estimated H-index: 7
,
Uday G. Hegde3
Estimated H-index: 3
,
Michael C. Hicks7
Estimated H-index: 7
This paper is concerned with the study of autoignition of fully developed free round turbulent jets consisting of oxidizing and chemically reacting components. We derive an elementary, still experimentally feasible, model for autoignition of such jets and present analysis of this model. The derivation of the model is based on the well-established experimental fact that the fully developed free round turbulent jets, in a first approximation, have the shape of a conical frustum. Moreover, the velo...
1 Citations Source Cite
Published on Aug 1, 2018in Combustion and Flame 4.49
Vedha Nayagam11
Estimated H-index: 11
,
Daniel L. Dietrich13
Estimated H-index: 13
+ 1 AuthorsForman A. Williams44
Estimated H-index: 44
Abstract Experimental observations are presented concerning radiative extinction of large n-alkane droplets in diluent-substituted environments at moderately varied pressures in microgravity onboard the International Space Station. The fuels considered are n-heptane, n-octane, and n-decane with carbon dioxide, helium, and xenon used as inerts, replacing nitrogen as diluents at varying amounts. It is shown that a simple scaling analysis, based on the assumptions that radiative extinction occurs w...
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Published on Aug 1, 2018in Microgravity Science and Technology 1.36
Fumiaki Takahashi17
Estimated H-index: 17
(Case Western Reserve University),
Viswanath R. Katta25
Estimated H-index: 25
,
Michael C. Hicks7
Estimated H-index: 7
(Glenn Research Center)
The two-stage combustion, local extinction, and flame-edge oscillations have been observed in single-droplet combustion tests conducted on the International Space Station. To understand such dynamic behavior of initially enveloped diffusion flames in microgravity, two-dimensional (axisymmetric) computation is performed for a gaseous n-heptane flame using a time-dependent code with a detailed reaction mechanism (127 species and 1130 reactions), diffusive transport, and a simple radiation model (f...
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Published on Oct 25, 2017
Michael C. Hicks7
Estimated H-index: 7
,
Uday G. Hegde3
Estimated H-index: 3
+ 2 AuthorsYves Garrabos17
Estimated H-index: 17
Published on Apr 23, 2017
Michael C. Hicks7
Estimated H-index: 7
,
Uday G. Hegde3
Estimated H-index: 3
,
Jun J. Kojima
Published on Jan 1, 2017
Sivamohan N. Reddy11
Estimated H-index: 11
(Indian Institute of Technology Roorkee),
Sonil Nanda17
Estimated H-index: 17
(York University)
+ 2 AuthorsJanusz A. Kozinski28
Estimated H-index: 28
(York University)
Abstract A novel concept was applied for the in situ study of the ignition of n -propanol–air hydrothermal flames during supercritical water oxidation. An innovative experimental arrangement including NASA's supercritical water oxidation facility was used to study the effect of reactor and oxidant (air) temperature on the spontaneous ignition of hydrothermal flames. New data were obtained concerning time- and temperature-resolved profiles of n -propanol in hydrothermal flames. Transient temperat...
1 Citations Source Cite
Published on Jan 1, 2017
Yuhao Xu5
Estimated H-index: 5
(Cornell University),
Michael C. Hicks7
Estimated H-index: 7
(Glenn Research Center),
C. Thomas Avedisian15
Estimated H-index: 15
(Cornell University)
Abstract The burning characteristics of iso -octane droplets in the standard atmosphere are reported over a large range of initial droplet diameters (0.5 mm D o 5 mm) for near one-dimensional droplet flames as promoted by low gravity. A ground-based drop tower and a space-based platform (International Space Station) were used to provide an environment to examine the influence of D o that encompasses regimes where radiation does not have an effect on burning to where it does. For D o K ) was near...
3 Citations Source Cite
Published on Oct 1, 2016in Siam Journal on Applied Mathematics 1.70
Peter V. Gordon7
Estimated H-index: 7
,
Uday G. Hegde3
Estimated H-index: 3
+ 1 AuthorsMichael J. Kulis4
Estimated H-index: 4
This paper is concerned with the derivation and mathematical analysis of a model for autoignition of laminar co-flow jets. Such jets consist of two parts: an inner part with oxidizer that is surrounded by an outer part with fuel, or the reverse. To derive a model we use a combination of Burke--Schumann theory of diffusion flames and Semenov--Frank-Kamenerskii theory of thermal explosion. The main advantage of our model is that it gives a well-defined condition for autoignition of a jet. We provi...
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Published on Sep 1, 2016in Combustion and Flame 4.49
Yu Cheng Liu10
Estimated H-index: 10
(University of Michigan),
Yuhao Xu5
Estimated H-index: 5
(Cornell University)
+ 1 AuthorsC. Thomas Avedisian15
Estimated H-index: 15
(Cornell University)
Abstract This paper reports the results of a comprehensive experimental study on the effect of initial droplet diameter ( D o ) over a very wide range (0.5 mm D o n -heptane, n -octane and n -decane – that are representative of components found in petroleum-based transportation fuels and their surrogates. Spherical symmetry in the burning process was promoted by carrying out the experiments in a reduced convection (stagnant ambience) and buoyancy (low gravity) environment using the facilities of...
14 Citations Source Cite
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