Conditions for Accurate CFD Modeling of Spray-Drying Process

Zbiciński, Ireneusz; Li, Xuanyou

doi:10.1080/07373930600778221

Cited by 43 publications

(7 citation statements)

References 8 publications

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“…is not using experimental data/measurements; it is through an overall transfer equation for the heat loss with the ambient (Julklang and Golman, 2015). Respect to M C sensitivity, the results obtained in this paper are in agreement with the outcomes showed by Zbiciński and Li (2006). They found a relation between the critical moisture content with the average drying rate of a maltodextrin spray drying system.…”

Section: Modelling a Production Scale Milk Drying Process: Parameter supporting

confidence: 94%

Modeling a production scale milk drying process: parameter estimation, uncertainty and sensitivity analysis

Ferrari

Gutiérrez

Sin

2016

Chemical Engineering Science

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Section: Modelling a Production Scale Milk Drying Process: Parameter supporting

confidence: 94%

Modeling a production scale milk drying process: parameter estimation, uncertainty and sensitivity analysis

Ferrari

Gutiérrez

Sin

2016

Chemical Engineering Science

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“…Several publications have comprehensively reported how 2-D and 3-D simulation approaches using various CFD packages (e.g. Fluent and CFX) can be helpful to predict agglomeration behavior during spray drying [33,49,97], evaluate particle trajectories [11], design new drying chamber configurations and assess atomizer performance [11,[36][37][38] as well as to study gas distribution within drying chambers [11,28,33,34,45,50,53,68,93,101,111]. The accuracy of prediction by finerscale approaches mainly depends on the selection of mass-heat-momentum conservation equations, the accuracy of turbulence models, the appropriateness of numerical methods used for solving equations and the quality of grid generation and algorithm development [28,47,50].…”

Section: "2-d" and "3-d" (Finest-scale) Simulation Approachesmentioning

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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“…It is difficult to closely match the model and experimental data in pilot-scale spray dryer modeling where there are significant uncertainties present in the measurement data in combination with the non-linearities and assumptions influencing accurate modeling of the spray drying process. The discrepancies between model predictions and experimental data, nevertheless, fall within an acceptable range of previously reported literature over the modeling of spray drying processes [53,123,126,127,[204][205][206]. Therefore, it could be concluded that, in general, the airflow temperature patterns followed the experimental trends, capturing the characteristics of the airflow (rotating and non-rotating streams).…”

Section: Model Validationsupporting

confidence: 79%

Towards a multizone vortex dryer for dairy sprays

Rahman

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Conventional co-current spray dryers are widely used in the dairy industry to produce milk powder. These dryers are known for their high capital costs and low thermal efficiencies and are responsible for almost 27-55% of the total energy consumption of the dairy industries. In comparison to co-current dryers, countercurrent dryers have higher thermal efficiencies but they are not employed in the food industry due to the risks of product degradation.The conventional spray dryers used in the food industry suffer from multitude of disadvantages. They operate at relatively low air temperatures to avoid product degradation, which results in small drying rates [13]. Furthermore, the terminal velocities of the particles result in small gas-solid slip velocities, restricting the heat and mass transfer. The advent of multi-stage spray dryers (two or three stages) with integrated fluidized beds has improved the energy efficiency of the process by 13% [13][14][15][16][17]. Nevertheless, the drying systems are still far from beingThe evolution of a vortex chamber technology is a Radial Multizone Dryer (RMD) [44][45][46][47], shown in Figure 1.1-b. In this configuration, hot air enters axially into the central zone while the vortex is created via relatively cold airflow entering the RMD via the tangential channels; see Figure 1.1a. The process intensification is developed as an outcome of both: multizone drying operations with high and low temperature air feeding zones, and high-G acceleration. Consequently, the drying occurs in two steps: (i) the majority of drying takes Chapter 6 summarizes the conclusions drawn in the previous chapters and provides recommendations for future research.Experimental investigations of the atomization and counter-current spray drying process 9 Chapter 2 EXPERIMENTAL INVESTIGATIONS OF THE ATOMIZATION AND COUNTER-CURRENT SPRAY DRYING PROCESSThis chapter presents an experimental analysis of a counter flow spray drying process using water and skim milk as a feed. The study is performed by examining the droplet size distribution of sprays and the temperature profiles in the dryer. The influence of air inlet temperature, air mass flow rate, feed flow rate, and droplet size on air temperatures in the dryer is evaluated. The evaporation and deposition zones are found to be highly dependent on droplet sizes. The obtained results show that it is possible to achieve efficient contact between hot air and spray in a small volume using a counter-current mechanism.

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Conditions for Accurate CFD Modeling of Spray-Drying Process

Cited by 43 publications

References 8 publications

Modeling a production scale milk drying process: parameter estimation, uncertainty and sensitivity analysis

Modeling a production scale milk drying process: parameter estimation, uncertainty and sensitivity analysis

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

Towards a multizone vortex dryer for dairy sprays

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