Measurement and prediction of speeds of sound of fatty acid ethyl esters and ethylic biodiesels

Freitas, Samuel V. D.; Santos, Ângela F.S.; Moita, Maria-Luísa C.J.; Follegatti–Romero, Luis A.; Dias, Telma Porcina Vilas Boas; Meirelles, Antônio José de Almeida; Daridon, Jean-Luc; Lima, Álvaro Silva; Coutinho, João A. P.

doi:10.1016/j.fuel.2013.02.041

Cited by 43 publications

(21 citation statements)

References 31 publications

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“…Fig. 8 shows the dependence of the effective Debye temperature of DAG oil versus pressure and temperature computed from (3), (4), (6), and (10). See also Table VII.…”

Section: J Effective Debye Temperature θ Dmentioning

confidence: 99%

“…Therefore, knowledge of their thermodynamic properties is essential for the understanding, design, and control of the production processes, e.g., in highpressure food processing and preservation. Knowledge of high-pressure thermodynamic properties of fuels and biofuels [5], [6] is also indispensable because of the increasing operating pressures (>200 MPa) in modern fuel-injection systems. Research on thermodynamic properties of liquids under high pressure and elevated temperatures is an important area of application in the mining industry, e.g., in extraction of crude petroleum, and in exploration for gas and geothermal resources.…”

mentioning

confidence: 99%

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Ultrasonic evaluation of thermodynamic parameters of liquids under high pressure

Kiełczyński

Szalewski

Balcerzak

et al. 2015

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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In many technological processes (e.g., in the chemical, petrochemical, food, and plastics industries), liquids are subjected to high pressures and temperatures. Therefore, knowledge of their thermodynamic properties is essential for understanding, design, and control of the process technology. Direct evaluation of the thermodynamic parameters of liquids under high pressure, using conventional methods, is very difficult. Therefore, the application of these methods in industrial conditions, particularly in on-line control of the technological parameters of liquids, is practically impossible. Ultrasonic methods (e.g., sound speed measurements) are very suitable for this purpose because of their simplicity and accuracy. The sound velocity is closely related to numerous thermodynamic properties of liquids. The objective of this paper is to address the influence of temperature and pressure on the thermodynamic parameters of liquids, using the example of diacylglycerol (DAG) oil, employing ultrasonic methods. In this paper, we present ultrasonic velocity and density measurements (performed by the authors) in DAG oil over a range of pressures and temperatures. On the basis of experimental results (the sound velocity and liquid density versus pressure and temperature) a series of DAG oil thermodynamic parameters such as specific heat ratio, intermolecular free path length, Van der Waals constant b, surface tension, and effective Debye temperature were evaluated as functions of pressure and temperature.

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“…Fig. 8 shows the dependence of the effective Debye temperature of DAG oil versus pressure and temperature computed from (3), (4), (6), and (10). See also Table VII.…”

Section: J Effective Debye Temperature θ Dmentioning

confidence: 99%

mentioning

confidence: 99%

Ultrasonic evaluation of thermodynamic parameters of liquids under high pressure

Kiełczyński

Szalewski

Balcerzak

et al. 2015

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…The density is measured at the atmospheric pressure and calculated for higher pressures. Measuring at the atmospheric pressure and temperatures from 293 to 343 K, Freitas et al [27] determine the speed of sound for different fuels and use the data to calculate and predict the acoustic characteristics of other biodiesel fuels [28]. Daridon et al [29] present the data for several different fuels where the speed of sound is measured at the atmospheric pressure and the range of temperatures from 283 to 373 K. For the same pressures and with the approach used in [24,25], Ţarska et al [30] determine the speed of sound for the biodiesel produced from coconut and palm oil.…”

Section: Introductionmentioning

confidence: 99%

Function K - As a Link Between Fuel Flow Velocity and Fuel Pressure, Depending on the Type of Fuel

et al. 2017

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Abstract. Regarding the application of vegetable oil based fuels in diesel engines, it is necessary to fully examine and understand the processes which take place in fuel delivery systems, namely, the processes of injection, mixture formation and combustion as well as emission characteristics. The paper provides an analysis of fuel flow in high pressure tubes of the fuel injection system, with the aim of determining function K as a link between fuel flow velocity and fuel pressure, and observing the influence of certain physical characteristics of the fuel upon the given function. The analysis presents the speed of sound and density, as fuel characteristics which affect the K function. The paper determines the speed of sound, density and bulk modulus for four fuels (pure rapeseed oil RO, biodiesel B100, a mixture of biodiesel and diesel B50, and diesel D), and forms appropriate K functions for each fuel in the pressure range from the atmospheric one to 1600 bar.

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“…Due to the depletion of non-renewable resources, the search for alternatives to petroleum-derived fuels is an active area of research. One proposed alternative, biodiesel, is a renewable and biodegradable energy source made up of a mixture of esters of long chain fatty acids [1][2][3]. The most common compounds utilized in biodiesel are fatty acid methyl esters (FAME) with molecular formula CH 3 (CH 2 ) n COOCH 3 ( Table 1) .…”

Section: Introductionmentioning

confidence: 99%

Predicting the phase behavior of fatty acid methyl esters and their mixtures using the GC-SAFT-VR approach

Haley

McCabe

2016

Fluid Phase Equilibria

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Biodiesel fuels, which consist of a blend of long chain fatty acid methyl esters, have attracted increased interest in recent years as possible alternates to fuels derived from petroleum. An understanding of the thermophysical properties and phase behavior of these molecules are therefore important to the investigation and design of biodiesel processes; however, such data is limited making the development of molecular based modeling approaches that can accurately and reliably determine the thermophysical properties of fatty acid methyl esters an important research area. Here we apply the group contribution based statistical associating fluid theory for potential of variable range (GC-SAFT-VR) equation of state to the study of long chain fatty acid methyl esters that comprise biodiesel fuels. With minimal reliance on experimental data, the GC-SAFT-VR equation of state offers a predictive approach that allows for the description of heterosegmented chains to correlate and predict the phase behavior of pure associating and nonassociating fluids and their mixtures. Model parameters for the C=O, CH 3 , CH 2 , CH=CH2, OCH 2 , and OCH 3 functional groups and their cross interactions were taken from earlier work and used here in a transferable fashion to predict the thermophysical properties and phase behavior of pure fatty acid methyl esters and their mixtures with other fatty acid methyl esters, alcohols, and carbon dioxide. It is shown that the GC-SAFT-VR approach can be used as a purely predictive tool, without fitting any new model parameters, to accurately predict the phase behavior of the fatty acid methyl ester fluids and their mixtures studied.

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Measurement and prediction of speeds of sound of fatty acid ethyl esters and ethylic biodiesels

Cited by 43 publications

References 31 publications

Ultrasonic evaluation of thermodynamic parameters of liquids under high pressure

Ultrasonic evaluation of thermodynamic parameters of liquids under high pressure

Function K - As a Link Between Fuel Flow Velocity and Fuel Pressure, Depending on the Type of Fuel

Predicting the phase behavior of fatty acid methyl esters and their mixtures using the GC-SAFT-VR approach

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