An empirical approach in predicting biodiesel viscosity at various temperatures

Krisnangkura, Kanit; Yimsuwan, Tawatchai; Pairintra, Rattanachai

doi:10.1016/j.fuel.2005.05.010

Cited by 176 publications

(127 citation statements)

References 14 publications

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“…Formula (31) can still be used at temperatures above 353.15 K, although with lower accuracy [34]. Remembering that the final results are not very sensitive to the values of ν l , this formula is used in the temperature range 293.15 K ≤ T ≤ min(700 K, T cr ).…”

Section: Liquid Viscositymentioning

confidence: 99%

Modelling of biodiesel fuel droplet heating and evaporation

Sazhin

Qubeissi

Kolodnytska

et al. 2014

Fuel

112

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Biodiesel fuel droplet heating and evaporation is investigated using the previously developed models, taking into account temperature gradient, recirculation, and species diffusion within droplets. The analysis is focused on four types of biodiesel fuels: Palm Methyl Ester, Hemp Methyl Esters, Rapeseed oil Methyl Ester, and Soybean oil Methyl Ester. These fuels contain up to 15 various methyl esters and possibly small amounts of unspecified additives, which are treated as methyl esters with some average characteristics. Calculations are performed using two approaches: 1) taking into account the contribution of all components of biodiesel fuels (up to 16); and 2) assuming that these fuels can be treated as a one component fuel with averaged transport and thermodynamic coefficients. It is pointed out that for all types of biodiesel fuel the predictions of the multi-component and single component models are rather close (the droplet evaporation times predicted by these models differ by less than about 5.5%). This difference is much smaller than observed in the case of Diesel and gasoline fuel droplets, and is related to the 1 Corresponding author, e-mail: S.Sazhin@brighton.ac.uk Preprint submitted to FuelMarch 28, 2013 fact that in the case of Diesel and gasoline fuel droplets the contribution of components in a wide range of molar masses and enthalpies of evaporation needs to be taken into account, while in the case of biodiesel fuels the main contribution comes from the components in a narrow range of molar masses and enthalpies of evaporation. As in the case of Diesel and gasoline fuel droplets, the multi-component model predicts higher droplet surface temperature and longer evaporation times than the single component model.

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Section: Liquid Viscositymentioning

confidence: 99%

Modelling of biodiesel fuel droplet heating and evaporation

Sazhin

Qubeissi

Kolodnytska

et al. 2014

Fuel

112

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“…By considering the carbon number, Krisnangkura et al [18] proposed different equations [equation (9) and equation (10)] to determine viscosity of biodiesels with long and short carbon structure at different temperatures. In Krisnangkura's equations, number of the carbon atoms is required a-priori which limits the use of equation (9) and equation (10).…”

Section: Viscosity Of Biodieselmentioning

confidence: 99%

Prediction models for density and viscosity of biodiesel and their effects on fuel supply system in CI engines

Tesfa¹,

Mishra²,

Gu³

et al. 2010

Renewable Energy

197

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Biodiesel is a promising non-toxic and biodegradable alternative fuel used in the transport sector. Nevertheless, the higher viscosity and density of biodiesel poses some acute problems when it is used it in unmodified engine. Taking this into consideration, this study has been focused towards two objectives. The first objective is to identify the effect of temperature on density and viscosity for a variety of biodiesels and also to develop a correlation between density and viscosity for these biodiesels. The second objective is to investigate and quantify the effects of density and viscosity of the biodiesels and their blends on various components of the engine fuel supply system such as fuel pump, fuel filters and fuel injector. To achieve first objective density and viscosity of rapeseed oil biodiesel, corn oil biodiesel and waste oil biodiesel blends (0B, 5B, 10B, 20B, 50B, 75B, and 100B) were tested at different temperatures using EN ISO 3675:1998 and EN ISO 3104:1996 standards. For both density and viscosity new correlations were developed and compared with published literature. A new correlation between biodiesel density and biodiesel viscosity was also developed. The second objective was achieved by using analytical models showing the effects of density and viscosity on the performance of fuel supply system. These effects were quantified over a wide range of engine operating conditions. It can be seen that the higher density and viscosity of biodiesel have a significant impact on the performance of fuel pumps and fuel filters as well as on air-fuel mixing behaviour of compression ignition (CI) engine.

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“…The density of the two non-polar phases (Tables 2 and 4) are very similar, while the viscosity is noticeably higher in the canola mixture because of the longer average carbon chain length of the fatty acids (Krisnangkura et al, 2006).…”

Section: Viscosity and Densitymentioning

confidence: 91%

Development and validation of a two phase CFD model for tubular biodiesel reactors

Boer

Bahri

2015

Computers & Chemical Engineering

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The use of biodiesel as an alternative to diesel has gained increasing momentum over the past 15 years. To meet this growing demand there is a need to optimise the transesterification reactor at the heart of the biodiesel production system. Assessing the performance of innovative reactors is difficult due to the liquid-liquid reaction mixture that is affected by mass transfer, reaction kinetics and component solubility. This paper presents a Computational Fluid Dynamic model of a tubular reactor developed in ANSYS CFX that can be used to predict the onset of mixing via turbulent flow. In developing the model an analysis of the reaction mixture is provided before the presentation of experimental data, which includes flow visualisation results and temperature dependant viscosity and density data for each phase. The detailed data and model development procedure represents an advancement in the modeling of the two phase transesterification reaction used in biodiesel production..

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An empirical approach in predicting biodiesel viscosity at various temperatures

Cited by 176 publications

References 14 publications

Modelling of biodiesel fuel droplet heating and evaporation

Modelling of biodiesel fuel droplet heating and evaporation

Prediction models for density and viscosity of biodiesel and their effects on fuel supply system in CI engines

Development and validation of a two phase CFD model for tubular biodiesel reactors

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