Thermocapillary flow effects on convective droplet evaporation

Shih, Ann T.; Megaridis, Constantine M.

doi:10.1016/0017-9310(95)00137-x

Cited by 49 publications

(27 citation statements)

References 13 publications

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“…[18][19][20] In these studies, however, the main interest was the change of the drag force due to the Marangoni effect in the presence of a strong convective flow. Furthermore, many simplifying assumptions employed in these studies, such as quasi-steadiness, 18 quiescent liquid, 19 or vorticity-stream function formulation, 19,20 along with the existence of strong forced convective flow limit the understanding of thermo-capillary flow effect and the mechanism of vapor jet ejection. Considering the difficulties in detailed experimental measurements, high-fidelity computational modeling is well suited to investigate the physical mechanism for these phenomena.…”

Section: Introductionmentioning

confidence: 99%

A computational study of droplet evaporation with fuel vapor jet ejection induced by localized heat sources

Sim

Chung

2015

Physics of Fluids

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A computational study of droplet evaporation with fuel vapor jet ejection induced by localized heat sources Droplet evaporation by a localized heat source under microgravity conditions was numerically investigated in an attempt to understand the mechanism of the fuel vapor jet ejection, which was observed experimentally during the flame spread through a droplet array. An Eulerian-Lagrangian method was implemented with a temperaturedependent surface tension model and a local phase change model in order to effectively capture the interfacial dynamics between liquid droplet and surrounding air. It was found that the surface tension gradient caused by the temperature variation within the droplet creates a thermo-capillary effect, known as the Marangoni effect, creating an internal flow circulation and outer shear flow which drives the fuel vapor into a tail jet. A parametric study demonstrated that the Marangoni effect is indeed significant at realistic droplet combustion conditions, resulting in a higher evaporation constant. A modified Marangoni number was derived in order to represent the surface force characteristics. The results at different pressure conditions indicated that the nonmonotonic response of the evaporation rate to pressure may also be attributed to the Marangoni effect. C 2015 AIP Publishing LLC. KAUST Repository[http://dx

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Section: Introductionmentioning

confidence: 99%

A computational study of droplet evaporation with fuel vapor jet ejection induced by localized heat sources

Sim

Chung

2015

Physics of Fluids

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“…Figure 13 shows the comparison of the temperature distribution inside the oil and emulsion droplets with/without the Marangoni effect. The internal circulation is slightly enhanced with the Marangoni effect in both cases, similarly in Shih and Megaridis (1996). Figure 13c shows the surface temperature in the early transient period.…”

Section: Marangoni Effect On a Parent Oil Dropletmentioning

confidence: 75%

Modeling Temperature Distribution Inside an Emulsion Fuel Droplet Under Convective Heating: A Key to Predicting Microexplosion and Puffing

et al. 2016

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Microexplosion/puffing is rapid disintegration of a water-in-oil emulsion droplet caused by explosive boiling of embedded superheated water sub-droplets. To predict microexplosion/puffing, modeling the temperature distribution inside an emulsion droplet under convective heating is a prerequisite, since the temperature field determines the location of nucleation (vapor bubble initiation from superheated water). In the first part of the present study, convective heating of water-in-oil emulsion droplets under typical combustor conditions is investigated using high-fidelity simulation in order to accurately model inner-droplet temperature distribution. The shear force due to the ambient air flow induces internal circulation inside a droplet. It has been found that for droplets under investigation in the present study, the liquid Peclet number PeL is in a transitional regime of 100

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“…It has attracted much attention from both fundamental and industrial aspects, such as melt-growth of crystal, thin-film coating, and droplet evaporation etc. (Hu and Imaishi 2000;Shih and Megaridis 1996;Chang and Wilcox 1976). In the past few decades, many experiments and numerical simulations have been performed.…”

Section: Introductionmentioning

confidence: 99%

Stability of Thermocapillary Convection in Annular Pools with Low Prandtl Number Fluid

Liu

Shi

et al. 2009

Microgravity Sci. Technol.

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In order to understand the stability characteristics of thermocapillary convection in an annular pool with low Prandtl number (Pr = 0.011) fluid, a linear stability analysis had been performed. The annular pool was heated from the outer cylindrical wall and cooled at the inner wall. Bottom and top surface were adiabatic. The results show that the critical Marangoni number and the critical wave number decrease with the increase of the aspect ratio, which is defined as the ratio of the depth to the gap width of the annular pool. When the aspect ratio exceeds 0.12, the critical wave number keeps almost constant. As the radius ratio increases, the critical Marangoni number decreases slightly, while the critical wave number increases. In the gravity condition, the effect of the buoyancy on the critical Marangoni number and wave number increases gradually with the increase of the aspect ratio.

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Thermocapillary flow effects on convective droplet evaporation

Cited by 49 publications

References 13 publications

A computational study of droplet evaporation with fuel vapor jet ejection induced by localized heat sources

A computational study of droplet evaporation with fuel vapor jet ejection induced by localized heat sources

Modeling Temperature Distribution Inside an Emulsion Fuel Droplet Under Convective Heating: A Key to Predicting Microexplosion and Puffing

Stability of Thermocapillary Convection in Annular Pools with Low Prandtl Number Fluid

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