Experimental investigation of biofuel drop impact on stainless steel surface

Sen, Suchibrata; Vaikuntanathan, Visakh; Sivakumar, D.

doi:10.1016/j.expthermflusci.2014.01.014

Cited by 39 publications

(20 citation statements)

References 48 publications

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“…In particular, the deposition and subsequent spreading without forming a crown shape is a basic behavior of droplet impingement on solid surfaces. Theoretical, empirical, and semi-empirical relations that describe this process have been proposed in previous research [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] to predict the maximum spreading factor β m , defined as the ratio d max /d 0 , where d max is the maximum spreading diameter and d 0 is the initial droplet diameter. Correlations between β m , Weber number We (=ρ l u 2 d 0 /σ lg , where ρ l , u, d 0 , and σ lg represent the liquid density, impinging velocity, initial droplet diameter, and surface energy density of the liquid, respectively) and Reynolds number Re (=ρ l ud 0 /µ l , where µ l is the viscosity of the liquid) are mainly discussed considering the balance between the inertia, viscosity, and capillary effects [3,8,9,[22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Universality of Droplet Impingement: Low-to-High Viscosities and Surface Tensions

Yonemoto

Kunugi

2018

Coatings

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When a droplet impinges on a solid surface, its kinetic energy is mainly converted to capillary energy and viscous dissipation energy, the ratio of which depends on the wettability of the target surface and the liquid properties. Currently, there is no experimental or theoretical evidence that suggests which types of liquids exhibit the capillary energy-dominated impingement behavior. In this paper, we reported the droplet impingement behavior for a wide range of liquid viscosities, surface tensions and target surface wettabilities. Then, we showed that a recently developed energy balance equation for the droplet impingement behavior can be universally employed for predicting the maximum spreading contact area diameter of a droplet for Newtonian liquids in deposition process by modelling the droplet surface deformation. Subsequently, applicability limitations of recent existing models are discussed. The newly developed model demonstrated that the capillary energy-dominated impingement behavior can be observed at considerably low viscosities of liquid droplets such as that of the superfluid of liquid helium.

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Section: Introductionmentioning

confidence: 99%

Universality of Droplet Impingement: Low-to-High Viscosities and Surface Tensions

Yonemoto

Kunugi

2018

Coatings

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“…Important for the design of an engine combustor is understanding how biofuels "behave" in contact with solid surfaces (Rioboo, Marengo & Tropea, 2002;Sen, Vaikuntanathan & Sivakumar, 2014). For instance, thorough examinations of engines parts like cylinder, piston and injector were undertaken after using in parallel biodiesel blends and diesel (Agarwal, Bijwe & Das, 2003).…”

Section: Three Generations Of Biofuelsmentioning

confidence: 99%

What Do We Know about Biofuels Today that Diesel and Ford Did Not?

Marinescu¹,

Cicea²

2018

MER

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Would have ever thought Rudolf Diesel and Henry Ford that a day will come when fuel will be extracted from algae? What would Diesel say when hearing about biodiesel or green diesel? Or would Ford say "I told you so" when discovering that ethanol became a reliable fuel? We would be proud to tell them how many efforts have been made and how many scientists and researchers dedicated their work to biofuels. The present paper makes an introduction into the biofuels' field and tries to answer the question raised in the title by providing a genuine configuration of biofuels generations and supporting evidence of their trends which will help both Ford and Diesel catch up with progress. By their nature, biofuels remain a large debated subject, a useful tool for tackling energy questions and a growing alternative to be explored in more depth.

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“…Although numerous experiments have been performed with recent advanced instruments, most of the obtained data were limited to a few macroscopic quantities such as droplet diameter, spreading ratio, liquid splat thickness etc. (Stow and Hadfield 1981;Harvie and Fletcher 2001;Rioboo et al 2002;Sen et al 2014). On the other hand, numerical and analytical studies have generated various sets of data (Kamnis and Gu 2005;Fukai et al 1995;Pasandideh-Fard et al 2002;Mao et al 1997;Roisman et al 2009).…”

Section: Introductionmentioning

confidence: 97%

Full-field spreading velocity measurement inside droplets impinging on a dry solid surface

Erkan

Okamoto

2014

Exp Fluids

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Liquid droplet impacts onto solid surfaces have attracted enormous amount of attention from wide range of research fields including experimental and numerical investigations. Unlike experimental efforts, numerical and analytical studies generated various sets of data. In this study, we investigated the spreading velocities inside the water droplets impinging onto a dry glass substrate using time-resolved PIV. The method, together with the high spatiotemporal resolution and the additional treatments improving the robustness, allowed us to resolve the radial velocity profiles efficiently in the spreading phase. Several impact velocity cases ranging from 0.40 to 0.96 m/s were studied. They correspond to low and moderate level Weber numbers (4.9-27.6). We observed that instantaneous radial velocity distributions exhibit linear and nonlinear modes. The nonlinearity is caused by the vortical flows formed at outer regions of the spreading liquid lamella. We demonstrated that even at low impact velocities the linear parts of the profiles obey a quasi-one-dimensional theory proposed in the literature. The comparison of obtained results with a literature-based numerical study, performed for high range of Weber numbers, confirmed the simultaneous existence of linear and nonlinear parts in the radial velocity profiles. In spite of the scale differences in terms of Weber number, the agreements in the tendencies of the profiles imply the validity of the mechanism considered in the numerical study even at low and moderate level range of Weber numbers.

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Experimental investigation of biofuel drop impact on stainless steel surface

Cited by 39 publications

References 48 publications

Universality of Droplet Impingement: Low-to-High Viscosities and Surface Tensions

Universality of Droplet Impingement: Low-to-High Viscosities and Surface Tensions

What Do We Know about Biofuels Today that Diesel and Ford Did Not?

Full-field spreading velocity measurement inside droplets impinging on a dry solid surface

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