Experimental and numerical analysis of spray-atomization characteristics of biodiesel fuel in various fuel and ambient temperatures conditions

Park, Su Han; Kim, Hyung Jun; Suh, Hyun Kyu; Lee, Chang Sik

doi:10.1016/j.ijheatfluidflow.2009.04.003

Cited by 110 publications

(63 citation statements)

References 19 publications

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“…At the same time, analyzing sprays out of a multi-hole nozzle in an engine is really challenging and for that reason, researchers often have recourse to specific installations. Injecting sprays in an isothermal environment is simple and their similarity to gaseous jets make such study a powerful tool to analyze mixing processes [5,6].…”

Section: Introductionmentioning

confidence: 99%

Fuel concentration in isothermal Diesel sprays through structured planar laser imaging measurements

Payri

Marti

Manin

2012

International Journal of Heat and Fluid Flow

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ELSEVIER SCIENCE INCPayri, R.; Gimeno, J.; Marti-Aldaravi, P.; Manin, J. (2012). Fuel concentration in isothermal Diesel sprays through structured planar laser imaging measurements. International Journal of Heat and Fluid Flow. 34:98-106. doi:10.1016/j.ijheatfluidflow.2011.12.007 Fuel concentration in isothermal Diesel sprays through structured planar laser imaging measurements AbstractThe mixing of isothermal liquid sprays in engine-like conditions has been investigated by applying the Structured Planar laser Imaging technique to remove multiple light scattering. The intensity of the illumination plane has been recovered by removing multiply scattered light and mapping the spray three-dimensionally via discrete tomography. Based on the extinction of light within the illumination plane, the number density has been extracted. Coupled with 2-D maps of droplet diameters obtained through LIF/Mie ratio, the number density allowed to calculate the fuel concentration in the sprays. The mixture fraction of DI Diesel sprays injected into an inert environment held at room temperature has been evaluated and compared to a validated model based on gas-jet theory. The experimental results showed good agreement with the predictions when assuming a Gaussian radial distribution and tuning the Schmidt number. A Schmidt number below the unity demonstrated to be the best fit to the results. In addition, the Gaussian distribution showed to be a good assumption based on the closeness to the experiments, although some differences in shape have been noticed. For different testing conditions, whilst the influence of ambient density on mixing was expected, the effect of injection pressure brought up additional information concerning the global mixing of liquid sprays.

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Section: Introductionmentioning

confidence: 99%

Fuel concentration in isothermal Diesel sprays through structured planar laser imaging measurements

Payri

Marti

Manin

2012

International Journal of Heat and Fluid Flow

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“…In the literature of industrial atomizers, outcomes of Equations (11) and (17) are more commonly compared with D 32 (Patterson and Reitz 1998;Senecal et al 1999;Larmi and Tiainen 2003;Park et al 2009), which is more widely used in spray applications. Figures 4-6 show that the droplet size predictions by the jet and sheet breakup models agree more closely with the measured D 10 value.…”

Section: Droplet Size Predictionsmentioning

confidence: 99%

Transient aerodynamic atomization model to predict aerosol droplet size of pressurized metered dose inhalers (pMDI)

Gavtash

Versteeg

Hargrave

et al. 2017

Aerosol Science and Technology

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Pressurized metered dose inhalers (pMDI) produce large numbers of droplets with smaller sizes than 5 mm to treat asthma and other pulmonary diseases. The mechanism responsible for droplet generation from bulk propellant liquid is poorly understood, mainly because the small length scales and short time scales make it difficult to characterize transient spray formation events. This article describes the development and findings of a numerical atomization model to predict droplet size of pharmaceutical propellants from first principles. In this model, the velocity difference between propellant vapor and liquid phase inside spray orifice leads to formation of wave-like instabilities on the liquid surface. Two variants of the aerodynamic atomization model are presented based on assumed liquid precursor geometry: (1) cylindrical jet-shaped liquid ligaments surrounded by vapor annulus; (2) annular liquid film with vapor flow in the core. The growth of instabilities on the liquid precursor surfaces and the size of the subsequently formed droplets are predicted by numerical solutions of dispersion equations. The droplet size predictions were compared with phase doppler anemometry (PDA) data and the predictions were in good agreement with the number mean diameter D 10 , which is representative of the respirable droplets. The temporal behavior of droplet size production was captured consistently well during the period of the first 95% of the propellant mass emission. The outcome of our modeling activities also suggests that, in addition to saturated vapor pressure of the propellant, its viscosity and surface tension are also key properties that govern pMDI droplet size. EDITORWarren Finlay

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“…[24][25][26][27] A homogeneous mixture in the combustion chamber contributes to reduce emissions of particulate matter (PM), unburned hydrocarbons (HCs) and nitrogen oxides (NO x ), as well as lower fuel consumption. 28,29 Although studies have focused on soybean biodiesel produced via the methanol and ethanol routes, the performance and emissions of soybean biodiesel-diesel blends in diesel cycle engines with mechanical injection still require evaluation, since the Brazilian fleet of cars and light commercial vehicles is considered to be an average age of about eight years. 30 Moreover, studies that use mechanical injection enable relevant parameters to be obtained to evaluate fuels and exhaust emission treatment systems in real operating conditions at low operating costs.…”

Section: Introductionmentioning

confidence: 99%

Biodiesel Glycerides from the Soybean Ethylic Route Incomplete Conversion on the Diesel Engines Combustion Process

Cataluña

Shah

Pelisson

et al. 2017

J. Braz. Chem. Soc.

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An evaluation was made to determine the effect of the glycerides presence resulting from the incomplete conversion of soybean biodiesel produced via alkaline catalysis and ethylic route on engine performance, and emissions in formulations containing 10 and 20% (m/m) of biodiesel used as additives in base diesel with low sulfur content and cetane ratings of 45 and 50. By way of comparison, similar formulations were used with soybean biodiesel methyl route with low concentration of glycerides. Tests on a diesel cycle engine with a mechanical fuel injection system indicated that the presence of glycerides decreases the volatility of biodiesel and increase the cetane number of fuels. The higher the cetane number, the higher the particulate matter emissions and the lower the unburned hydrocarbon emissions. Formulations with cetane number 50 showed higher emissions of particulate matter. The presence of glycerides in biodiesel reduces the fuel's vapor pressure, thereby increasing the cetane number and emissions of particulate matter and lower emissions of unburned hydrocarbons. The specific consumption of fuels formulated with biodiesel increases due to its lower enthalpy of combustion and to the presence of glycerides in fuels formulated with soybean biodiesel produced via the ethanol route.

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Experimental and numerical analysis of spray-atomization characteristics of biodiesel fuel in various fuel and ambient temperatures conditions

Cited by 110 publications

References 19 publications

Fuel concentration in isothermal Diesel sprays through structured planar laser imaging measurements

Fuel concentration in isothermal Diesel sprays through structured planar laser imaging measurements

Transient aerodynamic atomization model to predict aerosol droplet size of pressurized metered dose inhalers (pMDI)

Biodiesel Glycerides from the Soybean Ethylic Route Incomplete Conversion on the Diesel Engines Combustion Process

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