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Yiguang Ju
Princeton University
385Publications
57H-index
10.2kCitations
Publications 390
Newest
Abstract A novel ignition strategy using multi-channel sparks was developed in this paper. Compared with the typical single spark, the three-channel spark ignition technique enables three spatially separated and temporally synchronized discharges to increase the ignition kernel size while maintaining the same total ignition energy. The three-channel discharge characteristics, ignition kernel development, and ignition probability of lean n-pentane/air mixtures were studied and compared with those...
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Abstract Understanding the multi-channel dynamics of O(1D) reactions with unsaturated hydrocarbon molecules in low temperature reaction kinetics is critically important in stratospheric chemistry, plasma chemistry, plasma assisted fuel reforming, materials synthesis, and plasma assisted combustion. A photolysis flow reactor coupled with highly selective mid-infrared Faraday Rotation Spectroscopy (FRS) and direct ultraviolet-infrared (UV-IR) absorption spectroscopy (DAS) techniques was developed ...
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#1Tianhan Zhang (Princeton University)H-Index: 2
#2Yiguang Ju (Princeton University)H-Index: 57
Abstract The laminar flame speeds and structures of near-limit autoignition-assisted cool and warm n-heptane/air flames at different ignition Damkӧhler numbers which are the ratios between flow residence time and the ignition delay time, elevated temperatures and pressures are studied computationally and analytically over a broad range of equivalence ratios. The primary objective of this work is to understand the effects of the ignition Damkӧhler number, mixture temperature, equivalence ratio, a...
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Single wall carbon nanotube (SWCNT) additives were formulated into µm-Si-graphite composite electrodes and tested in both half cells and full cells with high nickel cathodes. The critical role of small amount of SWCNT addition (0.2 wt%) was found for significantly improving delithiation capacity, first cycle coulombic efficiency (FCE), and capacity retention. Particularly, Si (10 wt%)-graphite electrode exhibits 560 mAh/g delithiation capacity and 92% FCE at 0.2 C during the first charge-dischar...
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#1Xiaofang Yang (Princeton University)H-Index: 25
#2Fang Zhao (Princeton University)H-Index: 2
Last.Bruce E. Koel (Princeton University)H-Index: 52
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Development of earth-abundant electrocatalysts for hydrogen evolution and oxidation reactions in strong acids represents a great challenge for developing high efficiency, durable, and cost effective electrolyzers and fuel cells. We report herein that hafnium oxyhydroxide with incorporated nitrogen by treatment using an atmospheric nitrogen plasma demonstrates high catalytic activity and stability for both hydrogen evolution and oxidation reactions in strong acidic media using earth-abundant mate...
4 CitationsSource
#1Hongtao Zhong (Princeton University)
#2Mikhail N. Shneider (Princeton University)H-Index: 37
Last.Yiguang Ju (Princeton University)H-Index: 57
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The control of plasma instability of weakly ionized plasma in a reactive flow is of great importance in plasma-assisted combustion, catalysis, fuel reforming and material synthesis. In this work, we propose a new concept of plasma chemical instability and analyze the mechanisms and impact of plasma chemical instability on the transition from a uniform discharge to a contracted state of a self-sustained glow discharge in a reactive Halt;subagt;2alt;/subagt;-Oalt;subagt;2alt;/subagt;-Nalt;subagt;2...
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#1Alex G. Novoselov (Princeton University)H-Index: 1
#2Christopher B. Reuter (Princeton University)H-Index: 8
Last.Michael E. Mueller (Princeton University)H-Index: 17
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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: 57
#2Christopher B. Reuter (Princeton University)H-Index: 8
Last.Sang Hee Won (USC: University of South Carolina)H-Index: 3
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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...
1 CitationsSource
#1Ning Du (CAS: Chinese Academy of Sciences)H-Index: 1
#2Wenjun Kong (Beihang University)
Last.Yiguang Ju (Princeton University)H-Index: 57
view all 4 authors...
Effects of tube diameter and equivalent ratio on flame propagation characteristics of lean ethylene–oxygen mixtures in millimeter-scale cylindrical tubes were experimentally investigated. Five diff...
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