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C. Thomas Avedisian
Cornell University
CombustionDrop (liquid)BoilingChemistrySoot
51Publications
14H-index
667Citations
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Publications 51
Newest
#1Yuhao Xu (PV: Prairie View A&M University)
Last. Dan PhillipsH-Index: 1
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This paper reports new results about the combustion dynamics of hydroprocessed renewable jet fuel droplets derived from heterotrophic algae (AHRJ) burning under conditions that promote one-dimensional transport dynamics and near spherically symmetric burning conditions. Results are compared between Jet-A and three AHRJ/Jet-A mixtures containing 25%, 50%, and 75% AHRJ by volume. The results show that AHRJ droplets burn slightly faster than Jet-A and have a significantly reduced sooting propensity...
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#1Pushan Sharma (Cornell University)
#2C. Thomas Avedisian (Cornell University)H-Index: 14
Last. Wing Tsang (NIST: National Institute of Standards and Technology)H-Index: 41
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Abstract In this paper, a simple method is presented to transform saturated liquid glycerol into a gaseous fuel mixture containing hydrogen (H2), carbon monoxide (CO), methane (CH4), ethylene (C2H4), and ethane (C2H6). It is based on glycerol decomposition within the vapor film of the film boiling regime of multiphase heat transfer on a horizontal tube. In film boiling, a thin gas layer of predominantly glycerol vapor surrounds the tube and decomposes as the gases flow in the film under the infl...
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#1C. Thomas Avedisian (Cornell University)H-Index: 14
#2Kyle Skyllingstad (Cornell University)H-Index: 1
Last. Michael J. Carrier (NIST: National Institute of Standards and Technology)H-Index: 5
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This paper presents methodologies to predict thermodynamic conditions that initiate flash boiling by spontaneous nucleation of liquids consisting of hundreds of miscible liquids and their lower order surrogate mixtures. The methods are illustrated with a kerosene-based fuel and a seven-component surrogate for it. The predictions are compared to measurements of nucleation temperatures obtained from a pulse-heating technique that rapidly heats a microscale platinum film immersed in a pool of the t...
1 CitationsSource
#1C. Thomas Avedisian (Cornell University)H-Index: 14
#2Wei-Chih Kuo (Cornell University)H-Index: 1
Last. Adam Lowery (Cornell University)H-Index: 1
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This paper reports a study of ethanol pyrolysis (C2H5OH, EtOH) by film boiling at temperatures ranging from 600 to 1500 K. The reactor space is created in a self-assembled manner by first bringing EtOH to a boil on the surface of a horizontal tube submerged in a pool of EtOH and then increasing the power to the tube in steps to force transitioning the boiling regimes through nucleate boiling, the critical heat flux state, and finally film boiling. EtOH pyrolysis is found to yield hydrogen in the...
1 CitationsSource
#1C. Thomas Avedisian (Cornell University)H-Index: 14
#2Wei-Chih Kuo (Cornell University)H-Index: 1
Last. Adam Lowery (Cornell University)H-Index: 1
view all 4 authors...
1 CitationsSource
#1Yuhao Xu (Cornell University)H-Index: 7
#2Michael C. Hicks (Glenn Research Center)H-Index: 8
Last. C. Thomas Avedisian (Cornell University)H-Index: 14
view all 3 authors...
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 CitationsSource
#1Eric J. Ching (Cornell University)H-Index: 2
#2C. Thomas Avedisian (Cornell University)H-Index: 14
Last. Michael J. Carrier (NIST: National Institute of Standards and Technology)H-Index: 5
view all 6 authors...
The bubble nucleation temperatures of several organic liquids (methanol, ethanol, butanol, n-heptane) on stress-minimized platinum (Pt) films supported by SiN membranes is examined by pulse-heating the membranes for times ranging from 1 μs to 10 μs. The results show that the nucleation temperatures increase as the heating rates of the Pt films increase. Measured nucleation temperatures approach predicted superheat limits for the smallest pulse times which correspond to heating rates over 10^8 K/...
3 CitationsSource
#1Yu Cheng Liu (UM: University of Michigan)H-Index: 11
#2Yuhao Xu (Cornell University)H-Index: 7
Last. C. Thomas Avedisian (Cornell University)H-Index: 14
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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...
18 CitationsSource
#1Yu Cheng Liu (UM: University of Michigan)H-Index: 11
#2Fahd E. Alam (USC: University of South Carolina)H-Index: 4
Last. Tanvir Farouk (USC: University of South Carolina)H-Index: 18
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Abstract This study reports results of experiments on the isolated droplet burning characteristics of butanol isomers ( n -, iso -, sec -, and tert -) under standard atmosphere conditions in an environment that promotes spherical combustion. The data are compared with predictions from a detailed numerical model (DNM) that incorporates complex combustion chemistry, radiative heat transfer, temperature dependent variable fluid properties, and unsteady gas and liquid transport. Computational predic...
7 CitationsSource
#1Yuhao Xu (Cornell University)H-Index: 7
#2Ivan Keresztes (Cornell University)H-Index: 19
Last. C. Thomas Avedisian (Cornell University)H-Index: 14
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Abstract Fuels derived from bio-feedstocks have received significant attention for their potential to reduce the consumption of petroleum-based liquid fuels, either through blending or direct use. Biofuels produced from heterotrophic microalgae are particularly attractive because of fast conversion of sustainable plant sugars into renewable oils of controllable quality and composition, but without the need for sunlight or carbon from the atmosphere for growth. This paper describes the results of...
14 CitationsSource
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