Biodiesel density and derived thermodynamic properties at high pressures and moderate temperatures

Ivaniš, Gorica R.; Radović, Ivona R.; Veljković, Vlada B.; Kijevčanin, Mirjana Lj.

doi:10.1016/j.fuel.2015.10.050

Cited by 43 publications

(32 citation statements)

References 32 publications

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“…Analytical formulas established in this work can be used in engineering calculations to design and optimize of highpressure technological processes of food conservation and processing, as well as to characterize high-pressure physicochemical properties of biofuels (Ivanis et al 2016).…”

Section: Discussionmentioning

confidence: 99%

Evaluation of High-Pressure Thermophysical Parameters of the Diacylglycerol (DAG) Oil Using Ultrasonic Waves

Kiełczyński

Szalewski

Balcerzak

et al. 2016

Food Bioprocess Technol

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Modeling of high-pressure technological processes in the food industry requires knowledge of thermophysical parameters of processed foodstuffs in a broad range of pressures and temperatures. However, the high-pressure thermophysical parameters of foodstuffs are very rarely published in the literature. Therefore, further research is necessary to achieve a deeper insight into the biophysical and thermophysical phenomena under pressure to provide better control of technological processes and optimize the effects of pressure. The essential goal of this work is to evaluate the impact of high pressure and temperature on the thermophysical parameters of liquid foodstuffs on the example of diacylglycerol (DAG) oil (which attracted recently a considerable attention from research and industrial communities due to its remarkable benefits for health), using ultrasonic wave velocity and density measurements. Isotherms of adiabatic and isothermal compressibility, isobaric thermal expansion coefficient, internal pressure, and thermal pressure coefficient versus pressure were evaluated, based on the measurement of the compressional ultrasonic wave velocity and density of DAG oil at high pressures (up to 500 MPa) and at various temperatures. The adiabatic compressibility is affected mostly by the changes of pressure, i.e., it grows about four times when the pressure increases from the atmospheric pressure (0.1 MPa) to 400 MPa at a temperature of 50°C. By contrast, the internal pressure is a pronounced function of the temperature, i.e., it increases six times when the temperature rises from 20 to 50°C at a pressure of a 200 MPa. To perform numerical calculations, it was convenient to introduce a Tammann-Tait type equation of state to approximate the measured density isotherms of the investigated DAG oil. The results obtained in this paper can be applied in modeling and optimization of high-pressure technological processes and processing of foodstuffs. Evaluation of high-pressure isotherms of the considered thermophysical parameters of the DAG oil is an original authors' contribution to the state-ofthe-art.

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Section: Discussionmentioning

confidence: 99%

Evaluation of High-Pressure Thermophysical Parameters of the Diacylglycerol (DAG) Oil Using Ultrasonic Waves

Kiełczyński

Szalewski

Balcerzak

et al. 2016

Food Bioprocess Technol

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“…The predictive parameters SSE and RMSE are lower than 10 -3 for all the fittings which, as Table 10 shows, calculate the liquid C p with errors lower than 1 %. (16) Oppositely from what happened with the viscosity and solid C p general models, the first formulated general equation already gave good results, with relatively low errors, lower than 7 % for all fatty acids. Notwithstanding, it seemed that as in viscosity results, there is a relation between the errors obtained and the effect of the carboxylic group, more important in liquid state for low carbon structures.…”

Section: Liquid Cpmentioning

confidence: 91%

Empirical equations for viscosity and specific heat capacity determination of fatty acids

Ferrer

Barreneche

Palacios

et al. 2017

Journal of Energy Storage

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Phase change materials (PCM) used in thermal energy storage (TES) systems have been presented, over recent years, as one of the most effective options in energy storage. Saturated fatty acids are one of the most used PCM in TES systems, as they have high phase change enthalpy but in addition they do not present subcooling nor hysteresis and have proper cycling stability. The simulations and design of a TES system require the knowledge of the thermophysical properties of materials. Thermal conductivity, viscosity, specific heat capacity (C p) can be experimentally determined, but these are material and time consuming tasks. To avoid or to reduce them, and to have reliable data without the need of experimentation, thermal properties can be determined by empirical equations. In this paper, three empirical equations are given to calculate the viscosity, solid C p , and liquid C p of the whole fatty acid family of PCM.

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“…Peak cylinder pressures were higher for biodiesel blends (waste cooking oil, rapeseed, and corn biodiesels) compared to mineral diesel [107]. Operation of a four stroke, vertical, aircooled diesel engine with waste cooking oil methyl ester and mineral diesel blends (20,40,80, and 100% v/v) resulted in an increase in brake-specific energy consumption, and peak cylinder pressure, while reduction in peak heat release rate (HRR) [108]. Peak cylinder pressures for different blends (PME20, PME40, PME60, and PME80) of Pongamia biodiesel were quite similar to that of mineral diesel.…”

Section: Combustion Characteristics Of Biodieselmentioning

confidence: 95%

Review of Experimental and Computational Studies on Spray, Combustion, Performance, and Emission Characteristics of Biodiesel Fueled Engines

Ágarwal

Park

Dhar

et al. 2018

Journal of Energy Resources Technology

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Biodiesel has emerged as a suitable alternative to mineral diesel in compression ignition (CI) engines in order to ensure global energy security and to reduce engine out emissions in near future. Biodiesel derived from various feedstocks available worldwide fits well in the current fuel supply arrangement for transport sector. However, biodiesel as an alternative transportation fuel has been extensively investigated because of differences in its important fuel properties compared with baseline mineral diesel. Since fuel properties greatly influence spray development, combustion, and emission formation in internal combustion (IC) engines, a number of experimental and computational studies on biodiesel usage in CI engines have been performed to determine its brake thermal efficiency (BTE), gaseous emissions, durability, etc., by various researchers using variety of engines and feedstocks. In the present paper, a critical review of the effect of biodiesel's fuel properties on engine performance, emissions, and combustion characteristics in existing diesel engines vis-a-vis conventional diesel has been undertaken. In addition, the progress and advances of numerical modeling involving biodiesel are also reviewed to determine the effect of fuel properties on spray evolution and development of reaction mechanisms for biodiesel combustion simulations. Fuel properties are discussed in two categories: physical and chemical properties, which are key parameters affecting spray and combustion processes. Subsequent sections review spray, combustion, emissions, and performance characteristics of biodiesels under various engine operation conditions. In the last section of this review paper, numerical modeling of biodiesel covering recent numerical models and schemes to understand the behavior of biodiesel combustion and pollutants formation is included. This review paper comprehensively summarizes biodiesel fuel's (BDFs) spray, combustion, and emission characteristics using experimental and numerical approaches. Limitations and scope for future studies are discussed in each section.

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Biodiesel density and derived thermodynamic properties at high pressures and moderate temperatures

Cited by 43 publications

References 32 publications

Evaluation of High-Pressure Thermophysical Parameters of the Diacylglycerol (DAG) Oil Using Ultrasonic Waves

Evaluation of High-Pressure Thermophysical Parameters of the Diacylglycerol (DAG) Oil Using Ultrasonic Waves

Empirical equations for viscosity and specific heat capacity determination of fatty acids

Review of Experimental and Computational Studies on Spray, Combustion, Performance, and Emission Characteristics of Biodiesel Fueled Engines

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