Like-drop collisions of biodiesel and emulsion diesel

Chen, Rong Horng; Wang, Wei Cheng; Chen, You Wei

doi:10.1016/j.euromechflu.2016.07.009

Cited by 22 publications

(5 citation statements)

References 14 publications

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“…The same applies for a series of measurements conducted for different alkanes, however using two droplet sizes, namely 300 and 600 m (Huang and Pan 2015). Concerning the data for Diesel (Chen et al 2016) only the first point matches quite well, whereas the other two are a bit below the correlation. These results actually stem from mixtures of regular Diesel with Biodiesel (which is supposed to be ethanol) which are normally fully miscible although there are appreciable differences in dynamic viscosity and density.…”

Section: Generalised Collision Mapsmentioning

confidence: 80%

“…For fluid droplets experimental data expand up to Oh < 0.5 and for solution droplets until Oh < 0.4. In some cases, a limiting value for the parameter has been specified such as: For pure fluids: alcohols and refence oils (Sommerfeld and Kuschel 2016), different alkanes including tetradecane (Qian andLaw 1997, Huang andPan 2015) and Diesel-Biodiesel mixtures Chen et al (2016) and mixture of water and glycerol (Finotello et al 2018a). ) for pure fluid as well as solution droplets together with the proposed polynomial correlations (Eqn.…”

Section: Generalised Collision Mapsmentioning

confidence: 99%

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Euler/Lagrange Computations of Sprays Produced by Different Liquids using a Generalised Stochastic Droplet Collision Model

Sommerfeld

Laı́n

2021

ICLASS

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Recent experimental data on binary droplet collision outcomes in the form of collision maps allow the extension and further validation of the previously proposed boundary line models. This concerns the lower bouncing boundary, the boundary between both stretching as well as reflexive separation and the coalescence region. All the proposed boundary lines include the effect of droplet size ratio. The bouncing boundary based on Estrade et al. (1999) was extended to include dissipation effects and the dependence of the two involved parameters on the non-dimensional impact parameter B. The stretching separation boundary was based on combining correlations proposed by Jiang et al. (1992) and Brazier-Smith et al. (1972) for including droplet size ratio and dissipation effects. Unfortunately, not for all experimental cases on equal sized binary droplet collisions the proposed boundary lines yield a perfect agreement. In order to demonstrate the effect of such differences (modelled boundary lines and experimentally observed boundary lines) in the presumed droplet collision maps, numerical spray simulations were conducted using the Euler/Lagrange approach with the fully stochastic droplet collision model as recently presented by Lain and Sommerfeld (2020). For that purpose, a relative dilute reference spray is considered where the spray properties at a injection plane are obtained from experiments.

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Section: Generalised Collision Mapsmentioning

confidence: 80%

Section: Generalised Collision Mapsmentioning

confidence: 99%

Euler/Lagrange Computations of Sprays Produced by Different Liquids using a Generalised Stochastic Droplet Collision Model

Sommerfeld

Laı́n

2021

ICLASS

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“…他发现尽管体积分数相同, 减小离散相液滴的尺寸会大幅度地增加乳化液的黏性. 最近 Chen等人 [39] 进行了水在柴油中的乳化液的双元液滴碰撞, 发现与生物柴油相比, 尽管与柴油-水乳化液具有相同的表观黏度和表面张力, 乳化液液滴具有较大的融合-分离临界韦伯数. 这可以理解为, 乳化液液滴碰撞时导致的液滴内部流动促使了离散水滴的碰撞, 从而增加表观黏性, 抑制了液滴的分离.…”

Section: 表面活性剂还广泛应用在液-液系统中来抑制液unclassified

Dynamics of binary droplet collision in gaseous environment

Zhang

2017

Sci. Sin.-Phys. Mech. Astron.

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This review aims to briefly discuss about the research progress of the dynamics of binary droplet collision in gaseous environment, with emphasis on revealing the multi-scale, multi-physics, and nonlinear characteristics of the problem. First, we reviewed the previous experiments on binary droplet collision in various gases of sub-and super-atmospheric pressures. Second, we highlighted several theoretical models accounting for coalescence, bouncing, and separation of identical droplets. Finally, we discussed the recent studies on droplet coalescence and subsequent mixing, and non-Newtonian droplet collision, which have been gained increasing interests.

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“…Hence the non-linear correlation proposed by Gotaas et al (2007) fits the high-viscosity data reasonably well (Figure 7 a) including silicon oils, MEG and DEG and a VOF (volume of fluid) simulation of Xia and Hu (2015) for 10 µm liquid aluminium droplets (Oh = 0.115). The critical Weber-number for mixtures of Diesel/Biodiesel and Diesel/water emulsions (Chen et al 2016) are however remarkably over-predicted by this correlation, similar to solution droplets of Kuschel and Sommerfeld (2013). Now we turn to the low Oh-regime wherefore numerous data are available (Figure 7 b).…”

Section: Characteristic Points In the Collision Mapsmentioning

confidence: 99%

Numerical analysis of sprays with an advanced collision model

Sommerfeld

Laı́n

2017

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

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Modelling of collisions between liquid droplets in the frame of a Lagrangian spray simulation has still many open issues, especially when considering higher viscous droplets and if colliding droplets have a large size difference. A generalisation of the collision maps is attempted based on the behaviour of characteristic points, namely the triple point where bouncing, coalescence and stretching separation coincide and the critical Weber-number where reflexive separation first occurs in head-on collisions. This is done by correlating experimental data with respect to the Capillary number with the Ohnesorge-number for the triple point and the critical Weber-number is also well described by a correlation the Ohnesorge-number. Based on these results the boundary line between stretching separation and coalescence is found by adapting the Jiang et al. (1992) correlation. For the upper boundary of reflexive separation the shifted Ashgriz and Poo (1990) correlation is used. It was however so far not possible to predict the lower bouncing boundary through the Estrade et al. (1999) boundary line correctly. The proposed boundary-line models were validated for various liquid, however still considering only a size ratio of one. With the developed three-line boundary model Euler/Lagrange numerical calculations for a simple spray system were conducted and the droplet collisions were analysed with respect to their occurrence. Droplet collision modelling is performed on the basis of the stochastic droplet collision model, also considering the influence of impact efficiency, which so far was neglected for most spray simulations. The comparison with measurements showed reasonable good agreement for all properties. KeywordsDroplet collisions, stochastic collision model, impact efficiency, collision outcomes, Euler/Lagrange calculations, spray simulations. IntroductionIn numerous technical and industrial spraying systems higher viscous liquids, suspensions or solutions are being atomised. Examples are liquid fuels (including bio-fluids) in combustion systems, liquid melts or other mineral melts in the field of materiel science and spray drying of foodstuff or pharmaceutical materials. Therefore, in a numerical calculation of such spraying systems, mostly done with an Euler/Lagrange approach, the resulting different liquid properties have to be accounted for. Here the focus is related to droplet collision modelling. Hence, established droplet collision models have to be generalized regarding liquid properties, mainly viscosity and surface tension. Since colliding droplets may have considerable different size also the droplet size ratio is an important parameter to be considered in droplet collision modelling. In order to model droplet collisions in the frame of the Lagrangian droplet parcel concept, where only pointmasses are tracked, applied to spraying systems several elementary processes have to be considered (Sommerfeld and Kuschel 2016). The first step is the detection of possible collisions between two droplets. In orde...

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Like-drop collisions of biodiesel and emulsion diesel

Cited by 22 publications

References 14 publications

Euler/Lagrange Computations of Sprays Produced by Different Liquids using a Generalised Stochastic Droplet Collision Model

Euler/Lagrange Computations of Sprays Produced by Different Liquids using a Generalised Stochastic Droplet Collision Model

Dynamics of binary droplet collision in gaseous environment

Numerical analysis of sprays with an advanced collision model

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