Model based analysis of the drying of a single solution droplet in an ultrasonic levitator

Sloth, Jakob; Kiil, Søren; Jensen, Anker Degn; Andersen, Sune Klint; Jørgensen, Kåre B.; Schiffter, Heiko A.; Lee, Geoffrey

doi:10.1016/j.ces.2005.11.051

Cited by 56 publications

(21 citation statements)

References 13 publications

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“…Droplet drying using acoustic levitation: In this method, single droplets are suspended using strong acoustic fields in an acoustic levitator. Changes in the droplet's temperature and diameter are measured using infrared thermal devices and digital camera/recorders, respectively [32,42,51,85,86,92,103,[105][106][107][108]. Moisture content profiles are estimated either from diameter profiles or often using a hygrometer to measure the outlet air humidity from the closed levitator.…”

Section: Drying Kinetics Measurementmentioning

confidence: 99%

One-dimensional simulation of co-current, dairy spray drying systems – pros and cons

Patel

Chen

Jeantet

et al. 2010

Dairy Sci. Technol.

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-One-dimensional (1-D) simulation is a useful technique for the evaluation of dryer operating parameters and product properties before conducting real spray drying trials. The main advantage of a 1-D simulation tool is its ability to perform fast calculations with significant simplicity. Mathematical models can be formulated using heat, mass and momentum balances at the droplet level to estimate time-dependent gas and droplet parameters. One of the purposes of this paper is to summarize key mathematical models that may be used to perform 1-D simulation for spray drying processes, predict essential product-drying gas parameters, assess the accuracy of prediction using pilot-scale spray drying data and perhaps most importantly address the main benefits and limitations of the 1-D simulation technique in relation to industrial spray drying operations. The results of a recent international collaborative study on the development of spray drying process optimization software for skim milk manufacture are presented as an example of the application of 1-D simulation in milk processing.spray drying / one-dimensional simulation / modeling / drying kinetics / dairy product / droplet drying Article published by EDP Sciences à l'échelle de la gouttelette pour estimer les paramètres de vapeur et de gouttelette qui varient au cours du temps. Un des objectifs de cet article est de présenter de façon synthétique les modèles mathé-matiques clés qui peuvent être utilisés pour réaliser une simulation 1-D, prédire les paramètres de vapeur essentiels pour le séchage du produit, évaluer la précision de la prédiction en utilisant les données du séchage par atomisation obtenues à l'échelle pilote, et enfin d'aborder les principaux bénéfices et limites de la technique de simulation 1-D en relation avec les opérations de séchage par atomisation industrielles. Les résultats d'une récente étude réalisée en collaboration internationale sur le développement d'un logiciel d'optimisation du procédé de séchage par atomisation pour la production de poudre de lait écrémé sont présentés pour illustrer l'application de la simulation 1-D.séchage par atomisation / simulation mono-dimensionnelle / modélisation / cinétique de séchage / produit laitier / séchage d'une gouttelette

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Section: Drying Kinetics Measurementmentioning

confidence: 99%

One-dimensional simulation of co-current, dairy spray drying systems – pros and cons

Patel

Chen

Jeantet

et al. 2010

Dairy Sci. Technol.

View full text Add to dashboard Cite

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“…Y sat is the moisture content of the gas at the interface (adiabatic saturation) and Y the moisture content in the bulk of the gas phase. The diffusion coefficient of the polymeric binder in water d bw was calculated as suggested by Sloth et al [27] for maltodextrin in water. The endpoint of shrinkage was determined when a binder mass fraction of 30 % (solubility limit) was reached at the outer diameter of the droplet.…”

Section: Droplet Shrinkage and Increase Of Concentration During Dryingmentioning

confidence: 99%

Stochastic Modeling of Fluidized Bed Granulation: Influence of Droplet Pre‐Drying

2011

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A stochastic Monte Carlo method was used to solve the population dynamics of fluidized-bed granulation. Special emphasis was put on the addition of liquid to the process and on the microprocess of droplet pre-drying. Pre-drying can occur during the flight of droplets from the tip of the nozzle to the fluidized bed, especially in top-spray configuration. A single-droplet drying model that considers the change of droplet diameter and of the radial concentration profile of binder in the droplet was developed and validated by experiments in an acoustic levitator. Combined with spray flow field considerations, this model can be used to retrieve an initial droplet diameter from spray measurements. Integrated in the Monte Carlo simulation, it shows that pre-drying can significantly decrease the agglomeration rate due to overspray and premature solidification instead of successful droplet deposition.

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“…Hence in a first step simple equations for a spherically model were taken from Sloth et al [12] and then translated into an SPH formulation. For simplicity only a pure, single-phase liquid inside the droplet was considered.…”

Section: Model Equationsmentioning

confidence: 99%

Experimental Investigation and Numerical Simulation of Spray Processes

Laackmann

Säckel

Cepelyte

et al. 2011

Macromolecular Symposia

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Summary: Acoustic levitation was investigated as a model for spray processes. The influence of different parameters on the drying process of aqueous polyvinylpyrrolidone (PVP) solutions was studied and compared to the evaporation of water. The adequacy of acoustic levitation as model for spray processes was demonstrated. Experiments with water and aqueous PVP solutions indicated no dependency of the droplet size on the drying process for droplets with a diameter between 300 mm and 1.5 mm. Particles dried in an acoustic levitator displayed good accordance of morphology with those obtained in a spray tower. Surprisingly the addition of PVP to water resulted in faster evaporation of the solvent. Mathematical models of single droplets within a spray process typically refer to spherically symmetric droplet geometries. The simulation of other morphologies and their evolution throughout the process is still very challenging. A new drying model based on a fully threedimensional meshfree approach is under development and shows good agreement to basic established models regarding the drying of a single droplet.

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Model based analysis of the drying of a single solution droplet in an ultrasonic levitator

Cited by 56 publications

References 13 publications

One-dimensional simulation of co-current, dairy spray drying systems – pros and cons

One-dimensional simulation of co-current, dairy spray drying systems – pros and cons

Stochastic Modeling of Fluidized Bed Granulation: Influence of Droplet Pre‐Drying

Experimental Investigation and Numerical Simulation of Spray Processes

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