Surface tension and viscosity measurement of some fuels using the (Surface Laser-Light Scattering)SLLS method

S. Bi1, G. Zhao1, J. Wu1 and Z. Liu1

1Key Laboratory of Thermal Fluid Science and Engineering of MOE, Xi'an Jiaotong University, Xi’an Shaanxi, P.R. China

Keywords: fuels; slls; surface tension; viscosity
property: surface tension and viscosity
material: fuels

In recent years, on the background of energy shortage and environmental problem, searching for and developing clean environment friendly and acceptable alternative fuels have become an urgent task. It has been found that alcohols, ethers and esters are the potential clean alternative fuels because of oxygenated fuel's low emission and being easily obtained. Surface tension and viscosity are important thermophysical properties of fluids, but it is acute absent for the alternative fuels and their mixtures, such as dimethoxy ethane, diethyl carbonate, 1-propanol, 2-propanol and n-butanol. In this work an experimental system was established to investigate surface tension and viscosity simultaneously. It is based on the capillary wave theory induced by thermal fluctuations in the internal liquid. Surface tension and viscosity of liquid can be obtained by investigating the ripples using the surface laser-light scattering method(SLLS). The surface tension of methanol and ethanol was measured using this system, and the deviations was less than ±2%. The surface tensions and viscosity of five purity of dimethoxy ethane, diethyl carbonate, 1-propanol, 2-propanol, n-butanol and two mixtures of methanol + n-heptane, methyl alcohol + iso-octane were measured with SLLS, and 80 surface tension and viscosity datas were obtained. The excess surface tensions were calculated and the surface tension data were correlated as a function of compositions, and the standard deviations were less than 0.01mN•m-1.

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