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Uday G. Hegde
Case Western Reserve University
18Publications
5H-index
49Citations
Publications 19
Newest
#1Sivamohan N. Reddy (IITR: Indian Institute of Technology Roorkee)H-Index: 12
#2Sonil Nanda (UWO: University of Western Ontario)H-Index: 20
Last.Janusz A. Kozinski (UW: University of Waterloo)H-Index: 5
view all 6 authors...
Abstract Hydrothermal flame is produced in an aqueous environment beyond the thermodynamic critical properties of water. It is an interface developed at the contact of oxidant and fuel in supercritical water and depends on the operating parameters. In-situ diffusion-limited hydrothermal flames were generated in a novel supercritical flame reactor designed by the National Aeronautics and Space Administration (NASA) at Glenn Research Center to investigate the impacts of oxidant flow rate and tempe...
1 CitationsSource
#1Michael C. HicksH-Index: 8
#2Uday G. HegdeH-Index: 5
1 Citations
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...
2 CitationsSource
#1Michael C. HicksH-Index: 8
#2Uday G. HegdeH-Index: 5
Last.Yves GarrabosH-Index: 16
view all 5 authors...
#1Michael C. HicksH-Index: 8
#2Uday G. HegdeH-Index: 5
Last.Jun J. KojimaH-Index: 1
view all 3 authors...
1 Citations
#1Sivamohan N. Reddy (IITR: Indian Institute of Technology Roorkee)H-Index: 12
#2Sonil Nanda (York University)H-Index: 20
Last.Janusz A. Kozinski (York University)H-Index: 33
view all 5 authors...
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...
8 CitationsSource
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...
Source
#1Peter V. Gordon (University of Akron)H-Index: 8
#2Daniel J. Gotti (USRA: Universities Space Research Association)H-Index: 1
Last.Gregory I. Sivashinsky (TAU: Tel Aviv University)H-Index: 29
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In this paper, we formulate and analyse an elementary model for autoignition of cylindrical laminar jets of fuel injected into an oxidizing ambient at rest. This study is motivated by renewed interest in analysis of hydrothermal flames for which such configuration is common. As a result of our analysis, we obtain a sharp characterization of the autoignition position in terms of the principal physical and geometrical parameters of the problem.
4 CitationsSource
#1Sivamohan N. Reddy (IITR: Indian Institute of Technology Roorkee)H-Index: 12
#2Sonil Nanda (York University)H-Index: 20
Last.Janusz A. Kozinski (York University)H-Index: 33
view all 5 authors...
Supercritical water oxidation is one of the most promising technologies for complete oxidation of complex organic compounds. Flames in supercritical water, often referred to as hydrothermal flames, improve the oxidation rates of reactants in an organic waste stream. The ignition and control of flames in supercritical water could potentially be used to reduce the reaction time (from seconds to milliseconds) and enhance the thermochemical decomposition rates of recalcitrant molecules without the r...
12 CitationsSource
#1Uday G. HegdeH-Index: 5
#2D. GottiH-Index: 1
Last.Michael C. Hicks (Glenn Research Center)H-Index: 8
view all 3 authors...
Abstract Observations of near-critical water jets are reported in the injection Reynolds number range of approximately 300–3000 to characterize their transition to turbulence. Three types of cases are described: (i) subcritical jet injected into subcritical water, (ii) supercritical jet injected into supercritical water, and (iii) supercritical jet injected into subcritical water. In each case, the working pressure was kept above the critical value to eliminate two-phase effects. For cases (i) a...
5 CitationsSource
12