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Yu Cheng Liu
University of Michigan
20Publications
10H-index
235Citations
Publications 20
Newest
#1Yu Cheng Liu (UM: University of Michigan)H-Index: 10
#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...
#1Yu Cheng Liu (UM: University of Michigan)H-Index: 10
#2Fahd E. Alam (USC: University of South Carolina)H-Index: 4
Last.Tanvir I. Farouk (USC: University of South Carolina)H-Index: 4
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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...
#1Yu Cheng LiuH-Index: 10
#2Brandon WalkerH-Index: 1
This paper reports the evaporation and combustion experiments of small amounts of pool liquid fuel and the preliminary quantification of functional groups including: CH2, CH3, t-butyl, iso-propyl and mono-substituted aromatics using light absorbance in the wave number range of 400-4000 cm -1 . The goal was to develop a method that formulates evaporation characteristics for a complex real fuel and use the results to establish a surrogate’s evaporation rate associated with real fuel’s functional g...
#1Fahd E. Alam (USC: University of South Carolina)H-Index: 4
#2Yu Cheng Liu (Cornell University)H-Index: 10
Last.Tanvir I. Farouk (USC: University of South Carolina)H-Index: 4
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Abstract Recent interest in alternative and bio-derived fuels has emphasized butanol over ethanol as a result of its higher energy density, lower vapor pressure and more favorable gasoline blending properties. Numerous efforts have examined the combustion of butanol from the perspective of low dimensional gas-phase transport configurations that facilitate modeling and validation of combustion kinetics. However, fewer studies have focused on multiphase butanol combustion, and none have appeared o...
#1Yu Cheng Liu (Cornell University)H-Index: 10
#2Yuhao Xu (Cornell University)H-Index: 7
Last.Michael C. Hicks (Glenn Research Center)H-Index: 8
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Abstract This study reports experimental evidence of gas phase micro-convection induced by support fibers used in droplet combustion experimentation. Soot aggregates formed during combustion of n-octane and n-decane droplets (initial diameters ranging from 0.5 mm to 5 mm) provide natural seeds to reveal the thermal and flow asymmetries involved. The experiments are carried out in an environment that reduces the influence of forced and buoyant convection for both free-floating (unsupported) and f...
#1Daniel L. Dietrich (Glenn Research Center)H-Index: 13
#2Vedha Nayagam (Case Western Reserve University)H-Index: 4
Last.Yu Cheng Liu (Cornell University)H-Index: 10
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This paper summarizes the first results from isolated droplet combustion experiments performed on the International Space Station (ISS). The long durations of microgravity provided in the ISS enable the measurement of droplet and flame histories over an unprecedented range of conditions. The first experiments were with heptane and methanol as fuels, initial droplet droplet diameters between 1.5 and 5.0 m m, ambient oxygen mole fractions between 0.1 and 0.4, ambient pressures between 0.7 and 3.0 ...
#1Yu Cheng LiuH-Index: 10
#2Jeff K. RahH-Index: 1
Last.C. Thomas AvedisianH-Index: 14
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A comprehensive investigation is reported on varying the initial droplet diameter (Do) over a wide range on the burning characteristics of three normal alkane fuels that are representative of components found in practical fuel systems. The droplet burning characteristics of n-heptane, n-octane and n-decane, were studied experimentally in a low gravity ambience to minimize the influence of convection and promote spherical droplet flames as well as formation of a shell-like structure of soot aggre...
#1Yu Cheng Liu (Cornell University)H-Index: 10
#2Anthony J. Savas (Cornell University)H-Index: 5
Last.C. Thomas Avedisian (Cornell University)H-Index: 14
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Abstract This study compares liquid fuel combustion characteristics of biofuels derived from camelina (POSF6152) and tallow (POSF6308) with a US domestic aviation fuel (Jet-A, POSF4658) using the spherically symmetric (one-dimensional) droplet flame configuration as the basis of comparison. A blend of camelina biofuel and Jet-A is also examined. The initial droplet diameters were fixed at 0.57 ± 0.03 mm. The biofuels studied have been considered as replacement fuels for conventional jet fuels. R...
#1Yu Cheng Liu (Cornell University)H-Index: 10
#2Tanvir Farouk (USC: University of South Carolina)H-Index: 17
Last.C. Thomas Avedisian (Cornell University)H-Index: 14
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This study presents an experimental effort and detailed numerical simulation of the burning process of an ester-based biodiesel fuel droplet – methyl decanoate (MD). The experiments are carried out using test droplets that are anchored to small SiC support structures (14 lm diameter) and that burn in an ambience subjected to a low gravity level to promote spherical symmetry in the droplet burning process. The initial droplet diameters are 0.53–0.57 mm and the combustion gas is normal atmospheric...
#1Tanvir Farouk (Princeton University)H-Index: 17
#2Yu Cheng Liu (Cornell University)H-Index: 10
Last.Frederick L. Dryer (Princeton University)H-Index: 66
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Abstract Combustion characteristics of isolated sub-millimeter sized methyl butanoate (MB) droplets are studied at low gravity (10 −4 m/s 2 ) in a 1.2 s drop tower. In the experiments, droplets were grown and deployed onto the intersection of two 14 μm silicon carbide fibers in a cross-string arrangement and exposed to symmetrically placed spark ignition sources. The initial droplet diameter was fixed at 0.54 ± 0.01 mm, and experiments were carried out in room temperature air at atmospheric pres...
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