Solidification characteristics of rising immiscible oil droplets in coolant

Nakao, Yoshiaki; Hishida, Makoto; Tanaka, Gaku; Shiina, Yasuaki

doi:10.1016/j.ijheatmasstransfer.2004.05.036

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…The particles were collected at the top of the coolant for measurements. The diameters of 20 to 30 particles were measured and the average values were used for further calculations, similar to the method described in [5] where 40 to 60 particles were used for the measurements and the average value was calculated in the case of solid particles. In the emulsion experiments in Fig.…”

Section: Experimental Setup and Methodsmentioning

confidence: 99%

“…The formation of solid particles from these PCMs are of great interest, however, only few studies are available on these systems. Nakao et al [5] reported the solidification of tetradecane as an example of PCMs in a direct contact type system. Although, direct heat and mass transfer between the liquid drops and continuous liquid media as well as solid particles and continuous liquid media have been studied for a number of industrial applications but limited research has focused on direct contact solidification (freezing) of PCM drops moving to a liquid coolant.…”

Section: Introductionmentioning

confidence: 99%

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Emulsion Solidification: Influence of the Droplet Size of the Water‐in‐Oil Emulsion on the Generated Particle Size

2011

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The solidification or crystallization characteristics of water-in-oil (w/o) emulsion drops generated from the capillary in stagnant coolant, here pure water, was investigated. The emulsions were prepared at different energy inputs by using a rotor stator and then pumped through a single orifice with the help of a syringe pump at a constant velocity. The uniform drops from this w/o emulsion were formed at the orifice exit which were then solidified in the coolant at a temperature below the freezing point of oil. The higher the energy input in the emulsification process, the lower was the size of water droplets distributed in the emulsion. The smaller water droplets in the emulsion affected the size of the drops from the orifice which then turned into solid particles. The water droplet distribution in the emulsion and the orientation or location within the solid particles were investigated and the ultimate effects on the particle formation from these emulsions observed.

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Section: Experimental Setup and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Emulsion Solidification: Influence of the Droplet Size of the Water‐in‐Oil Emulsion on the Generated Particle Size

2011

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“…A direct contact-type thermal energy storage system has received much attention in recent years. Nakao [11] reported the solidification of tetradecane as an example of a PCM in a direct contact-type system. Direct-contact heat and mass transfer between liquid droplets as well as solid particles in the coolant continuous liquid media have been extensively studied for a wide range of industrial applications [12].…”

Section: Introductionmentioning

confidence: 99%

Spherical‐particle generation by phase change materials: Near‐monosize particles from emulsions

Iqbal

Ulrich

2010

Chem Eng & Technol

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The solidification behavior of water-in-oil (W/O) emulsion droplets in stagnant pure water was investigated. The droplets were formed from a single capillary tube when the emulsion was pumped by a syringe pump. Different experimental parameters, like surfactant concentration in the preparation of the emulsion, water content in the W/O emulsions, and flow rate, were investigated. The surfactant concentrations were varied from 0.2 to 5 % by volume at different flow rates. The water contents were increased from 5 to 25 % also by volume. The investigation focused on the formation of droplets from a capillary tip. The solidification phenomena of the emulsion drops in the coolant were observed. With higher flow rates, a change from dripping to jetting phenomena was observed. The solid emulsion particles of different sizes were obtained depending on the parameters of the operation. The solid particles were not completely spherical in shape but somewhat ellipsoid.

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