Mass diffusivity affects the fuel atomization and combustion process in internal combustion engines. Along with our efforts to develop a clean diesel combustion technology using supercritical fluids, diffusivity of diesel fuel and surrogates in supercritical CO2 were measured by the chromatographic technique based on the Taylor dispersion theory at temperatures and pressures up to 100 �C and 30 MPa, respectively. Results were correlated using predictive models and empirical correlations. Experimental uncertainties of diffusivity measurements were also investigated. A new dimensionless parameter, f, defined by the ratio of the equivalent length of injection volume (Le,inj) over column diameter (D), was proposed to characterize the combined effect of injection volume and column diameter. Various combinations of injection volumes and column diameters were examined. It was found that the measured diffusivity increased with decreasing f and that near constant values were achieved at f below 5. The current study improved the chromatographic technique for diffusivity measurements.

Measurements of diffusivities of fuel surrogates in supercritical CO<sub>2</sub> by the chromatographic technique

243rd National Meeting (2012)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.

Measurements of diffusivities of fuel surrogates in supercritical CO2 by the chromatographic technique

Measurements of diffusivities of fuel surrogates in supercritical CO₂ by the chromatographic technique