Predicting the temperature dependent viscosity of biodiesel fuels

Yuan, Wenqiao; Hansen, Alan C.; Zhang, Q.

doi:10.1016/j.fuel.2008.11.011

Cited by 133 publications

(102 citation statements)

References 13 publications

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“…The spray area is the area covered by the spray in the effective images, which can be employed to reflect the quality of fuel-air mixing [13]. The spray area was obtained from the sum of the total effective pixels, and the spray area for BD80 is shown in Figure 8.…”

Section: Spray Areamentioning

confidence: 99%

“…It was suggested by most researchers that the physical properties of liquid fuel were the intrinsic factors affecting its spray characteristics [9][10][11][12][13]. Boggavarapu et al [9] reviewed the effect of fuel properties on the atomization process for both biofuels and fossil fuels and summarized that biodiesel sprays showed faster penetration and narrower spray plume angles and larger droplet sizes as compared to diesel.…”

Section: Introductionmentioning

confidence: 99%

“…They found that biodiesel presented longer spray tip penetration, smaller spray angle, projected area and volume than diesel spray, but larger Sauter mean diameter (SMD) due to its higher viscosity and surface tension. Yoon et al [12] and Yuan et al [13] reported that the temperature had a great influence on the physical properties of biodiesel. Compared to the fuel properties, the control parameters such as injection pressure, ambient pressure and blending ratio had more significant influence on the spray behavior in practice.…”

Section: Introductionmentioning

confidence: 99%

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An Experimental Study on the Macroscopic Spray Characteristics of Biodiesel and Diesel in a Constant Volume Chamber

et al. 2015

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Abstract:The objective of this study was to investigate the macroscopic spray characteristics of different 0%-100% blends of biodiesel derived from drainage oil and diesel (BD0, BD20, BD50, BD80, BD100), such as spray tip penetration, average tip velocity at penetration, spray angle, average spray angle, spray evolution process, spray area and spray volume under different injection pressures (60, 70, 80, 90, 100 MPa) and ambient pressures (0.1, 0.3, 0.5, 0.7, 0.9 MPa) using a common rail system equipped with a constant volume chamber. The characteristic data was extracted from spray images grabbed by a high speed visualization system. The results showed that the ambient pressure and injection pressure had significant effects on the spray characteristics. As the ambient pressure increased, the spray angle increased, while the spray tip penetration and the peak of average tip velocity decreased. As the injection pressure increased, the spray tip penetration, spray angle, spray area and spray volume increased. The increasing blend ratio of biodiesel brought about a shorter spray tip penetration and a smaller spray angle compared with those of diesel. This is due to the comparatively higher viscosity and surface tension of biodiesel, which enhanced the friction effect between fuel and the injector nozzle surface and inhibited the breakup of the liquid jet.

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Section: Spray Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Experimental Study on the Macroscopic Spray Characteristics of Biodiesel and Diesel in a Constant Volume Chamber

et al. 2015

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“…The spray area was used to represent the mixing quality between fuel and air [17]. In the present research, MATLAB software was employed to count the total effective pixels of spray image so as to represent the spray area.…”

Section: Spray Areamentioning

confidence: 99%

Experimental Investigation on the Early Stage Spray Characteristics with Biodiesel and Diesel

Yin

Wen

et al. 2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

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The early stage spray characteristics have a great impact on the secondary atomization progress, and thus affect the engine combustion and emission performances. The experimental investigation of the early stage spray behaviors with biodiesel and diesel was carried out by employing a laser-based Mie-scattering method. The results show that the spray tip penetration for biodiesel is higher than that for diesel at the early stage spray under the same injection pressure. Moreover, the early stage spray tip penetration can be longer under high injection pressures for two fuels. Besides, the early stage spray cone angle for biodiesel is narrower than that for diesel, and the spray cone angle is especially higher than biodiesel by 25.8% after start of injection time of 0.01ms. Furthermore, under the same injection condition, the difference of early stage spray area between diesel and biodiesel is not obvious, while the spray volume for biodiesel is larger than that for diesel, and also the spray volume can be enlarged by increasing injection pressure for both fuels. KeywordsSpray characteristics; Mie-scattering; Biodiesel; Diesel Introduction For modern diesel engines, soot and nitrogen oxide are the two main emissions which are mainly influenced by mixture quality of air and fuel, and the emission characteristics are largely governed by atomization and spray processes [1][2][3][4]. Biodiesel, derived from the waste cooking oil and a kind of renewable energy, has been widely used as an alternative fuel for diesel engines. It is clear that the use of biodiesel in diesel engine can improve favorable emissions performance [5][6][7][8][9]. Although the importance of biodiesel in reducing diesel engine emission performance has been acknowledged, the research on early stage spray characteristics of biodiesel is still far from sufficient. The early stage spray dominates the secondary spray progress and the mixture quality of fuel and air, and thus affects the atomization quality of biodiesel. Therefore, it is important to define the effects of biodiesel at the early stage spray characteristics. Wang et al. [10,11] studied the near-field primary spray characteristics of different split injection strategies by using ultra-high speed imaging method. Their results indicated that the second split injection cause smaller spray area and shorten penetration during the early stage spray, and also the larger late injection stage can increase the spray area and the penetration. Moreover, they found that the strong primary collision can be caused by improving the injection pressure and shortening dwell split injection, thus the spray area and the spray cone angle increase, while the spray tip penetration decreases at the same time. And they also found that the long duration of the first injection enhances the primary collision. Wang et al. [12] also studied the spray behaviors of emulsified diesel blended with water through schlieren technique. They concluded that the penetration increases as the magnitude of water increases, wh...

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“…[12] reported that natural coconut fatty acid melts within 22-24 o C. They used microencapsulation of coconut fatty acid for thermal energy storage at range of 22-34 o C. On the other hand, trancesterification offers the possibility to change the physical characteristics, especially the crystallization properties of fats and oils; while fatty acids themselves remain unchanged [13]. For example, it can be seen from [14] and [15] that coconut oil has similar percentage of fatty acids concentration compared to coconut-based biodiesel. Transesterification, often called alcoholysis, is the reaction of a fat or oil with an alcohol to form esters and glycerol [16].…”

Section: Introductionmentioning

confidence: 99%

Thermal Characteristics Evaluation of Vegetables Oil to be Used as Phase Change Material in Air Conditioning System

Indartono¹,

Suwono²,

Pasek³

et al. 2011

jtm

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In a typical commercial building, air conditioning system consumes around 60% of building's electricity. By looking at that number, it is clear that effort to suppress building energy consumption should be directed to air conditioning system. Recently, phase change substances, such as ice slurry, receive broad attention since the substances has ability to save energy in hydronic cooling system. Previous experiments by author showed that certain phase change material, i.e. trimethylolethane trihydrate, is able to save energy of a chiller. However, in Indonesia, the material is quite expensive. In this research, applicability of some lower-price materials, i.e. mixture of vegetables oil and biodiesel, as phase change material in secondary refrigerant were evaluated. Some thermal characteristics, such as freezing and melting temperatures, and also latent heat of the oils are explained in this paper.

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Predicting the temperature dependent viscosity of biodiesel fuels

Cited by 133 publications

References 13 publications

An Experimental Study on the Macroscopic Spray Characteristics of Biodiesel and Diesel in a Constant Volume Chamber

An Experimental Study on the Macroscopic Spray Characteristics of Biodiesel and Diesel in a Constant Volume Chamber

Experimental Investigation on the Early Stage Spray Characteristics with Biodiesel and Diesel

Thermal Characteristics Evaluation of Vegetables Oil to be Used as Phase Change Material in Air Conditioning System

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