Using response surface methodology to optimize the operating parameters in a top-spray fluidized bed coating system

Seyedin, Seyed Hadi; Zhalehrajabi, Ehsan; Ardjmand, Mehdi; Safekordi, Ali Akbar; Raygan, Shahram; Rahmanian, Nejat

doi:10.1016/j.surfcoat.2017.11.003

Cited by 13 publications

(6 citation statements)

References 24 publications

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“…The desirable quality of microstructures could be achieved by increasing the coating cycles, theproper flow of coating solution and its temperature, air velocity, atomizing pressure, the core to encapsulants ratio, and the use of coating material with desirable attributes such as lower viscosity, higher solubility, lower permeability, etc. [98,183,184]. Semyonov et al [185] encapsulated Lactobacillus paracasei by using molten wax with ethylcellulose solution (7% w/w) and noted a higher survival rate in the case of wax-coated particles at an inlet temperature 45 °C and an outlet temperature of 25 °C.…”

Section: Fluidized Bed Coatingmentioning

confidence: 99%

Microencapsulation as a Noble Technique for the Application of Bioactive Compounds in the Food Industry: A Comprehensive Review

et al. 2022

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The use of natural food ingredients has been increased in recent years due to the negative health implications of synthetic ingredients. Natural bioactive compounds are important for the development of health-oriented functional food products with better quality attributes. The natural bioactive compounds possess different types of bioactivities, e.g., antioxidative, antimicrobial, antihypertensive, and antiobesity activities. The most common method for the development of functional food is the fortification of these bioactive compounds during food product manufacturing. However, many of these natural bioactive compounds are heat-labile and less stable. Therefore, the industry and researchers proposed the microencapsulation of natural bioactive compounds, which may improve the stability of these compounds during processing and storage conditions. It may also help in controlling and sustaining the release of natural compounds in the food product matrices, thus, providing bioactivity for a longer duration. In this regard, several advanced techniques have been explored in recent years for microencapsulation of bioactive compounds, e.g., essential oils, healthy oils, phenolic compounds, flavonoids, flavoring compounds, enzymes, and vitamins. The efficiency of microencapsulation depends on various factors which are related to natural compounds, encapsulating materials, and encapsulation process. This review provides an in-depth discussion on recent advances in microencapsulation processes as well as their application in food systems.

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Section: Fluidized Bed Coatingmentioning

confidence: 99%

Microencapsulation as a Noble Technique for the Application of Bioactive Compounds in the Food Industry: A Comprehensive Review

et al. 2022

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“…[ 3–5 ] The technological potential of fluidized beds for environmental protection of heat‐sensitive products such as enzymes, proteins, or microorganisms is also well known. [ 6 ]…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5] The technological potential of fluidized beds for environmental protection of heat-sensitive products such as enzymes, proteins, or microorganisms is also well known. [6] Most previous studies have focused on cylindrical fluidized bed configurations with a constant cross-section. [7] Above the minimum fluidization velocity, the bubbling, channelling, and slugging phenomena lower the efficiency of gas-solid fluidized beds.…”

Section: Introductionmentioning

confidence: 99%

“…[8,9] Entrainment rates of particles and fluid velocity limitations in cylindrical fluidized beds lead to an increase in the application of tapered beds in industrial processes. [6] Tapered fluidized beds have been utilized in biological wastewater treatment processes, waste incineration, coating products, production of metabolic gas, and crystallization. [10,11] The variation of fluid velocity in the axial direction provides non-slugging flow regimes and also causes special hydrodynamic features which are desired when particles with broad size distributions, well particle mixing, high heat and mass fluxes, and stable temperature distributions are required.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation of homogeneous fluidization behaviour of Geldart Group A particles in gas tapered fluidized beds

2022

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A two-dimensional gas-solid tapered fluidized bed at laboratory-scale in a homogenous fluidization regime is simulated using the computational fluid dynamics (CFD) software COMSOL 5.4. The Eulerian-Eulerian (EE) hydrodynamic model is used to predict the minimum fluidization velocity, minimum bubbling velocity, bed height, and solid volume fraction of alumina particles (in Geldart Group A) in the bed with different tapered angles.The effects of static bed heights on the minimum fluidization velocity of tapered beds are investigated. The highest minimum fluidization velocity is 6 mm/s with a static height of 11 mm and a tapered angle of 12 . The bed height is increased with increasing superficial air velocity. At a given air velocity, the minimum bed height is obtained at a 12 tapered angle. A decrease in solid volume fraction is also observed upon an increase in the superficial air velocity. The CFD results show an almost uniform solid concentration over the bed height. The homogenous or non-bubbling regime appears in a wider range of critical velocity at a 12 tapered angle. In the case of a 0 tapered angle, the results of this study and the discrete element method computational fluid dynamics (DEM-CFD) simulation exhibit a good match. In the case of 6 and 12 tapered angles, the proposed model leads to good predictions based on the theory of homogenous fluidization of Geldart Group A. This research introduces a rapid and cost-effective approach for the better design and operation of a tapered fluidized bed in large scales.

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“…An optimal atomization air/pattern air ratio of atomizer for a good coating process has been found. In the research of Seyedin et al, 28 in order to optimize the coating mass of particles in a top-spray fluidized bed coating, they adopted RSM to conducted an experimental investigation. The effect of the fluidization air flow rate, atomization air flow rate, and liquid flow rate on the coating mass was determined by using DOE.…”

Section: Introductionmentioning

confidence: 99%

Optimal design of a pneumatic atomizer using response surface method to obtain more uniform coatings

Qiao

Zhu

Liu

2022

Advances in Mechanical Engineering

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Uneven coatings with overspray often occur to the target plate when using a pneumatic atomizer. This issue is mainly due to the high-level pressure in the plate center, which results from unreasonable design of the structure and operating parameters in atomizer. In this paper, an optimal design for these parameters was established by response surface method (RSM) and computational fluid dynamics (CFD) to produce more uniform coatings. The velocity data measured by a hot-wire anemometry experimentally verified the numerical model. Then, annular air hole diameter, horn flare angle, annular air pressure, and shaping air pressure were selected as design variables while the central pressure was chosen as objective function. The RSM with the central composite design (CCD) was employed to construct the regression equation that expresses the relationship between the central pressure and design parameters. Finally, the optimum combination of the parameters was carried out for reducing the central pressure, and the interaction effects between the parameters were also analyzed. The optimization results show that the central pressure is decreased by 44.6% and the performance of droplet size distribution is significantly improved. The experiment confirmed the effectiveness of the optimized atomizer to obtain well-distributed coatings.

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Using response surface methodology to optimize the operating parameters in a top-spray fluidized bed coating system

Cited by 13 publications

References 24 publications

Microencapsulation as a Noble Technique for the Application of Bioactive Compounds in the Food Industry: A Comprehensive Review

Microencapsulation as a Noble Technique for the Application of Bioactive Compounds in the Food Industry: A Comprehensive Review

Numerical simulation of homogeneous fluidization behaviour of Geldart Group A particles in gas tapered fluidized beds

Optimal design of a pneumatic atomizer using response surface method to obtain more uniform coatings

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