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Omar R. Yehia
Princeton University
Analytical chemistryChemistryMaterials scienceCool flameCombustor
13Publications
3H-index
34Citations
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Publications 13
Newest
#1Alex G. Novoselov (Princeton University)H-Index: 1
#2Christopher B. Reuter (Princeton University)H-Index: 9
Last. Michael E. Mueller (Princeton University)H-Index: 18
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Abstract Turbulence, low-temperature chemistry, and their interactions in the form of turbulent cool flames are critical to understanding and improving advanced engines. Design of such engines requires tractable simulations which in turn necessitate turbulent combustion models that can account for cool flames. While manifold-based turbulent combustion models are an attractive option for hot flames, their applicability to cool flames is not yet fully understood. This is partially due to the lack ...
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#1Yiguang Ju (Princeton University)H-Index: 60
#2Christopher B. Reuter (Princeton University)H-Index: 9
Last. Sang Hee Won (USC: University of South Carolina)H-Index: 5
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Abstract Cool flames play a critical role in ignition timing, burning rate, burning limits, engine knocking, and emissions in conventional and advanced combustion engines. This paper provides an overview of the recent progress in experimental and computational studies of cool flames. First, a brief review of low-temperature chemistry and classical studies of cool flames is presented. Next, the recent experimental and computational findings of cool flames in microchannels, microgravity droplet co...
11 CitationsSource
#1Omar R. Yehia (Princeton University)H-Index: 3
#2Christopher B. Reuter (Princeton University)H-Index: 9
Last. Yiguang Ju (Princeton University)H-Index: 60
view all 3 authors...
Abstract The development of alternative drop-in fuels and fuel blends with petroleum-derived fuels necessitate an understanding of the kinetic interactions between aromatics and alkanes for the development of advanced low-temperature combustion engines. In the present study, the role of aromatic chemistry on n -alkane low-temperature chemistry is investigated by using nitrogen-diluted nonpremixed cool flames of n -dodecane/ n -propylbenzene blends in an atmospheric counterflow burner. Effects of...
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#1Christopher Abram (Princeton University)H-Index: 8
Last. Yiguang Ju (Princeton University)H-Index: 60
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#1Christopher B. Reuter (Princeton University)H-Index: 9
#2Viswanath R. KattaH-Index: 1
Last. Yiguang Ju (Princeton University)H-Index: 60
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Abstract The interaction between a laminar flame and a vortex is an important study for understanding the fundamentals of turbulent combustion. In the past, however, flame-vortex interactions have been investigated only for high-temperature flames. In this study, the impact of a vortex on a premixed double flame, which consists of a coupled cool flame and a hot flame, is examined experimentally and computationally using dimethyl ether/oxygen/ozone mixtures. The double flame is first shown to occ...
2 CitationsSource
#1Omar R. Yehia (Princeton University)H-Index: 3
#2Christopher B. Reuter (Princeton University)H-Index: 9
Last. Yiguang Ju (Princeton University)H-Index: 60
view all 3 authors...
Abstract We demonstrate experimentally, perhaps for the first time, the existence of low-temperature multistage diffusion flames of n -alkanes. Multistage diffusion flames of n -heptane, n -decane, and n -dodecane are established in an atmospheric counterflow burner. Planar laser-induced fluorescence, chemiluminescence, and thermometry are used to probe the structures of such flames. In the first flame zone, the majority of the fuel is partially oxidized via low-temperature peroxy chemistry. In ...
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#1Christopher B. Reuter (Princeton University)H-Index: 9
#2Rui Zhang (Princeton University)H-Index: 1
Last. Yiguang Ju (Princeton University)H-Index: 60
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Abstract As advanced engines become more controlled by the fuel reactivity, it is important to have a complete understanding of combustion chemistry of fuel blends at both high and low temperatures. While the high-temperature chemistry coupling with transport and heat release can be examined through the use of flame experiments, low-temperature chemistry has been traditionally limited to homogeneous reactor experiments at fixed temperatures, which leaves the heat release rate unconstrained. In t...
10 CitationsSource
#1Omar R. Yehia (Princeton University)H-Index: 3
#2Christopher B. Reuter (Princeton University)H-Index: 9
Last. Yiguang Ju (Princeton University)H-Index: 60
view all 3 authors...
Abstract We report on experimental evidence of the existence of a new self-sustaining low-temperature multistage warm diffusion flame, existing between the cool flame and hot flame, at atmospheric pressure in the counterflow geometry. The structure of multistage warm diffusion flames was examined by using thermometry, laser-induced fluorescence, and chemiluminescence measurements. It was found that the warm diffusion flame has a two-staged double flame structure, with a leading diffusion cool fl...
9 CitationsSource
#1Christopher B. Reuter (Princeton University)H-Index: 9
#2Omar R. Yehia (Princeton University)H-Index: 3
Last. Yiguang Ju (Princeton University)H-Index: 60
view all 7 authors...
1 CitationsSource
12