TY - JOUR
T1 - Diffusion coefficients of diesel fuel and surrogate compounds in supercritical carbon dioxide
AU - Lin, Ronghong
AU - Tavlarides, Lawrence L.
N1 - Funding Information:
This work was supported by the New York State Energy Research and Development Authority (NYSERDA) under the Agreement No. 8915-1-2.
Copyright:
Copyright 2010 Elsevier B.V., All rights reserved.
PY - 2010/2
Y1 - 2010/2
N2 - Facilitating a new concept of clean diesel combustion using supercritical fluids requires a better understanding of thermophysical properties of the diesel fuel/diluent system. Mass diffusivity is one such property that is important to understand diesel fuel/diluent mixing and spray and combustion of supercritical fuel mixtures. In this work, diffusion coefficients of diesel fuel and surrogate compounds in supercritical carbon dioxide were experimentally determined by the Taylor dispersion method at temperatures from 313.15 to 373.15 K and pressures up to 30 MPa. Difficulties were encountered to measure diffusion coefficients using the Taylor dispersion method near the critical region of CO2 which resulted in curve-fitting errors greater than 5%. Predictive correlations including Wilke-Chang, Scheibel, and He-Yu were examined. Diffusivity data were also fitted by D12/T - η and D12 / sqrt(T) - ρ correlations. Results showed that the He-Yu correlation has the best prediction performance while the D12/T - η correlation best fits the data with AAD% < 8%.
AB - Facilitating a new concept of clean diesel combustion using supercritical fluids requires a better understanding of thermophysical properties of the diesel fuel/diluent system. Mass diffusivity is one such property that is important to understand diesel fuel/diluent mixing and spray and combustion of supercritical fuel mixtures. In this work, diffusion coefficients of diesel fuel and surrogate compounds in supercritical carbon dioxide were experimentally determined by the Taylor dispersion method at temperatures from 313.15 to 373.15 K and pressures up to 30 MPa. Difficulties were encountered to measure diffusion coefficients using the Taylor dispersion method near the critical region of CO2 which resulted in curve-fitting errors greater than 5%. Predictive correlations including Wilke-Chang, Scheibel, and He-Yu were examined. Diffusivity data were also fitted by D12/T - η and D12 / sqrt(T) - ρ correlations. Results showed that the He-Yu correlation has the best prediction performance while the D12/T - η correlation best fits the data with AAD% < 8%.
KW - Carbon dioxide
KW - Diesel fuel surrogates
KW - Diffusion coefficients
KW - Supercritical
KW - Taylor dispersion
UR - http://www.scopus.com/inward/record.url?scp=74449083976&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=74449083976&partnerID=8YFLogxK
U2 - 10.1016/j.supflu.2009.12.002
DO - 10.1016/j.supflu.2009.12.002
M3 - Article
AN - SCOPUS:74449083976
SN - 0896-8446
VL - 52
SP - 47
EP - 55
JO - Journal of Supercritical Fluids
JF - Journal of Supercritical Fluids
IS - 1
ER -