Measurement and prediction of high-pressure viscosities of biodiesel fuels

Freitas, Samuel V. D.; Segovia, José J.; Martín, M. Carmen; Zambrano, Johnny; Oliveira, Mariana B.; Lima, Álvaro Silva; Coutinho, João A. P.

doi:10.1016/j.fuel.2014.01.031

Cited by 48 publications

(22 citation statements)

References 23 publications

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“…As it was performed for the speed of sound, in order to quantify the density trends with temperature and pressure, and dispose of suitable data for further reference in the future, the density results have been fitted to a polynomial expression: (15) Note that, in this case, the term gathering the dependency of the property with the squared temperature has been kept. As opposed to the speed of sound, there is a small non-linearity of density with respect to the temperature.…”

Section: Density Determinationmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Characterization of the Thermodynamic Properties of Diesel Fuels Over a Wide Range of Pressures and Temperatures

Desantes¹,

Salvador²,

Carreres³

et al. 2015

SAE Int. J. Fuels Lubr.

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The influence of pressure and temperature on some of the important thermodynamic properties of diesel fuels has been assessed for a set of fuels. The study focuses on the experimental determination of the speed of sound, density and compressibility (via the bulk modulus) of these fuels by means of a method that is thoroughly described in this paper. The setup makes use of a common-rail injection system in order to transmit a pressure wave through a high-pressure line and measure the time it takes for the wave to travel a given distance. Measurements have been performed in a wide range of pressures (from atmospheric pressure up to 200 MPa) and temperatures (from 303 to 353 K), in order to generate a fuel properties database for modelers on the field of injection systems for diesel engines to incorporate to their simulations.

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Section: Density Determinationmentioning

confidence: 99%

“…The fuel properties stated before present an important dependence on pressure and temperature, as several authors have reported [2,5,13,14,15]. However, most of the studies report data either for relatively low pressures, or for fluids different than diesel fuels.…”

Section: Introductionmentioning

confidence: 99%

Experimental Characterization of the Thermodynamic Properties of Diesel Fuels Over a Wide Range of Pressures and Temperatures

Desantes¹,

Salvador²,

Carreres³

et al. 2015

SAE Int. J. Fuels Lubr.

View full text Add to dashboard Cite

show abstract

“…The formula for calculating the viscosity of percolation fluid is also given [25], but it is difficult to be applied directly because the thickness of the boundary layer and the average viscosity involved in this formula are difficult to be measured. Currently, there are many kinds of conventional viscosity testing methods, which are generally divided into three categories: capillary method [35,36], rotation method [37][38][39], and vibration method [40][41][42][43]. These methods can only measure the viscosity by direct contact with the fluid, and it is impossible to test the viscosity of the fluid in the porous media: that is, the in situ viscosity of fluid in porous media cannot be measured, whereas the in situ viscosity of the fluid in porous media is more capable of characterizing the transport capacity of the fluid, so it is especially necessary to develop the method of testing the in situ viscosity of fluid in porous media.…”

Section: Introductionmentioning

confidence: 99%

A Measured Method for In Situ Viscosity of Fluid in Porous Media by Nuclear Magnetic Resonance

Yang

Luo

et al. 2018

Geofluids

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At present, the existing measuring methods for viscosity of fluid can only obtain the viscosity of bulk fluid, while the in situ viscosity of fluid in porous media cannot be acquired. In this paper, with the combination of nuclear magnetic resonance (NMR) and physical simulation experiment, a testing method for in situ viscosity of fluid in porous media is established, and the in situ viscosity spectra of water in tight cores under different displacement conditions is obtained. The experimental results show that the in situ viscosity distribution of water in porous media is inhomogeneous, and it is not a constant but is related to the distance between water and rock walls. When the distance between fluid and rock walls is close enough (e.g., 2 relaxation time is less than 1 ms), the viscosity of fluid increases rapidly, and the in situ viscosity is greater than the bulk viscosity. Moreover, after the rock samples are saturated with water, the in situ viscosity of water is distributed as a double-peak structure. The left peak is characterized mainly by the in situ viscosity distribution of movable fluid, whose in situ viscosity is smaller, and the right peak mainly represents the in situ viscosity distribution characteristics of immovable fluid, whose in situ viscosity is larger and increases gradually. Under a relatively large driving force, the in situ viscosity amplitude of movable fluid decreases greatly, and the average in situ viscosity of residual water in the core is much higher than that of saturated water in initial state.

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“…The major problem associated with pure vegetable oils is their high viscosity at high pressure [4]. Many different methods, like dilution, microemulsion, pyrolysis, transesterification, have been considered to solve this problem [5][6][7][8][9]. Among all of these alternatives, transesterification is the most promising.…”

Section: Introductionmentioning

confidence: 99%

Could RME biodiesel be potentially harmful to modern engine? solidification process in RME

Tarakowski

Malanowski

Rostocki

et al. 2015

Fuel

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Measurement and prediction of high-pressure viscosities of biodiesel fuels

Cited by 48 publications

References 23 publications

Experimental Characterization of the Thermodynamic Properties of Diesel Fuels Over a Wide Range of Pressures and Temperatures

Experimental Characterization of the Thermodynamic Properties of Diesel Fuels Over a Wide Range of Pressures and Temperatures

A Measured Method for In Situ Viscosity of Fluid in Porous Media by Nuclear Magnetic Resonance

Could RME biodiesel be potentially harmful to modern engine? solidification process in RME

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