Evaporation and convective flow pattern of a heated pendant silicone oil droplet

He, Bin; Duan, Fei

doi:10.1016/j.ijheatmasstransfer.2015.02.044

Cited by 15 publications

(3 citation statements)

References 25 publications

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“…The thermocapillary convection is commonly involved in various industrial processes such as crystal growth, , droplet evaporation, , and microfluidics . The understanding of the dynamic behaviors of flows during thermocapillary convection becomes very important in both fundamental and industrial aspects.…”

Section: Introductionmentioning

confidence: 99%

Photostimulated Spiropyran for Instantaneous Visualization of Thermal Field Distribution and Flow Pattern

Chen

Liu

et al. 2020

J. Am. Chem. Soc.

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The study of thermocapillary convection has attracted the attention of researchers due to the importance in both fundamental and industrial aspects. To trace the state of flows in real time during thermocapillary convection, the development of imaging methods and tools is essential. Here we use a benzothiazole unit-bearing spiropyran (BS1-SP) as a photostimulated indicator to visualize the details of instantaneous temperature distribution and flow pattern on the surface of volatile solvent simultaneously with a high spatial and temporal resolution during convection. This work provides insights into dynamic self-organization and thermohydrodynamics taking place in evaporating systems, and a useful tool to study these behaviors.

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Section: Introductionmentioning

confidence: 99%

Photostimulated Spiropyran for Instantaneous Visualization of Thermal Field Distribution and Flow Pattern

Chen

Liu

et al. 2020

J. Am. Chem. Soc.

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“…Typically, droplets can be categorized into two types: pendant and sessile. For understanding evaporation kinetics, the pendant droplet approach has been adapted since such drops resemble free-standing droplets very closely, and unlike sessile droplets, their evaporation behavior is independent of surface features [12][13][14]. Godsave [15] initially investigated the evaporation behavior of near-spherical droplets and reported that molecular diffusion is the major driving parameter behind the evaporation kinetics.…”

Section: Introductionmentioning

confidence: 99%

Ferro-advection aided evaporation kinetics of ferrofluid droplets in magnetic field ambience

et al. 2020

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The present article discusses the physics and mechanics of evaporation of pendent, aqueous ferrofluid droplets and modulation of the same by external magnetic field. We show experimentally and by mathematical analysis that the presence of magnetic field improves the evaporation rates of ferrofluid droplets. First we tackle the question of improved evaporation of the colloidal droplets compared to water, and propose physical mechanisms to explain the same.Experiments show that the changes in evaporation rates aided by the magnetic field cannot be explained on the basis of changes in surface tension, or based on classical diffusion driven evaporation models. Probing using particle image velocimetry shows that the internal advection kinetics of such droplets plays a direct role towards the augmented evaporation rates by modulating the associated Stefan flow. Infrared thermography reveal changes in the thermal gradients within the droplet and evaluating the dynamic surface tension reveals presence of solutal gradients within the droplet, both brought about by the external field. Based on the premise, a scaling analysis of the internal magneto-thermal and magneto-solutal ferroadvection behavior is presented. The model incorporates the role of the governing Hartmann number, the magneto-thermal Prandtl number and the magneto-solutal Schmidt number. The analysis and stability maps reveal that the magneto-solutal ferroadvection is the more dominant mechanism, and the model is able to predict the internal advection velocities with accuracy. Further, another scaling model to predict the modified Stefan flow is proposed, and is found to accurately predict the improved evaporation rates.

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“…30,31 Determining the nonlinear mechanisms and elucidating the phenomena in acoustically levitated droplets are crucial for perfect sample manipulation. Although there are many studies related to the transport phenomena of the levitated droplet, [32][33][34][35][36][37][38][39][40][41] physical correlation between the hydrodynamic behavior across the boundary layer of the droplet interface and the phase change behavior from the droplet interface is still a remaining issue. 42 To develop container-less processing techniques using the ALM, the interaction between the hydrodynamic behavior and the phase change behavior across the acoustically levitated droplet surface must be investigated.…”

Section: Introductionmentioning

confidence: 99%

Flow structure and evaporation behavior of an acoustically levitated droplet

et al. 2018

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We experimentally investigate the flow structure and evaporation behavior of a droplet in an ∼19 kHz single-axis acoustic levitator. Decane, nonane, octane, heptane, hexane, and pentane are used as test fluids to investigate the effect of saturated vapor pressure on the internal and external flow fields. Under low saturated vapor pressure (decane and nonane), the direction of the external flow is away from the surface of the droplet. However, at a relatively higher saturated vapor pressure (octane, heptane, hexane, and pentane), the direction of the external flow is toward the surface of the droplet, with vortices forming near the droplet surface. For droplets with a low saturated vapor pressure (decane, nonane, octane, and heptane), the internal flow is similar to that in the case of rigid body rotation. Finally, under high saturated vapor pressure (hexane and pentane), the internal flow is an unsteady 3D complex flow. The experimental results indicate that the vapor concentration distribution around a levitated droplet surface correlates closely with changes in the external and internal flows.

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Evaporation and convective flow pattern of a heated pendant silicone oil droplet

Cited by 15 publications

References 25 publications

Photostimulated Spiropyran for Instantaneous Visualization of Thermal Field Distribution and Flow Pattern

Photostimulated Spiropyran for Instantaneous Visualization of Thermal Field Distribution and Flow Pattern

Ferro-advection aided evaporation kinetics of ferrofluid droplets in magnetic field ambience

Flow structure and evaporation behavior of an acoustically levitated droplet

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