scholarly journals CFD model-supported design of monodisperse co-current spray dryers

2018 ◽  
Author(s):  
Maciej Jaskulski ◽  
Thi Thu Hang Tran ◽  
Evangelos Tsotsas
Keyword(s):  
Spray Drying ◽  
Skim Milk ◽  
Temperature Profiles ◽  
Thermal Deactivation ◽  
Cfd Model ◽  
Drying Process ◽  
Particle Collisions ◽  
Air Velocity ◽  
Cfd Simulations ◽  
Initial Droplet

In this study the operation of spray drying chambers fitted by the multi-stream monodisperse atomizer was simulated by the previously developed CFD model of skim milk spray drying. A series of CFD simulations of skim milk monodisperse spray drying were performed. The influence of different nozzle positions, initial droplet diameters (180 μm and 167 μm) and the way of air introduction (vertical or swirling with 30° or 60° angle) on the drying process were checked. Parameters like drying air and particle residence time, wall deposition, inter-particle collisions, protein thermal deactivation, air velocity and temperature profiles were compared for each case. Keywords: CFD, spray drying, skim milk, monodisperse atomizers, optimization.

scholarly journals The Viability of Lactobacillus plantarum From Intestines of Laying Ducks Encapsulated With Arabic Gum and Skimmed Milk

2021 ◽  
Vol 16 (3) ◽  
pp. 190-199
Author(s):  
Badat Muwakhid ◽  
Anik Maunatin ◽  
Anif Mukaromah Wati
Keyword(s):  
Lactic Acid ◽  
Lactic Acid Bacteria ◽  
Spray Drying ◽  
Skim Milk ◽  
Plate Count ◽  
Resistance Testing ◽  
Drying Process ◽  
Arabic Gum ◽  
Before And After ◽  
Skimmed Milk

The aim of this study was to evaluate the effect of the types of encapsulation materials, that is skimmed milk and Arabic gum on two probiotics Lactic Acid Bacteria (LAB), including L. plantarum DJ2 and L. plantarum DJ3. The methods of this study were separated into two stages that is probiotic resistance testing during the spray drying process and the viability of LAB after spray drying during storage of probiotic powder for one month at 4oC. Changes in the viability of LAB probiotics before and after the drying process using spray drying were determined by the total plate count. The viability of lactic acid bacteria (LAB) was observed every week for one month of storage at 4oC. The results showed that different encapsulation materials had significant different (P ≤ 0.05) on changes in resistance of probiotics powder during spray drying process. The use of Arabic gum could increase the resistance of probiotics during the spray drying process, meanwhile, the use of skimmed milk was better to be able to maintain the viability of dry probiotic powder both on L.plantarum DJ2 and L.plantarum DJ3 during storage. After four weeks of storage, there was mold and yeast in the skimmed milk and Arabic gum materials. In conclusion, both Arabic gum and skim milk could be used for encapsulation where storage of dry probiotic products is recommended during one month at 4 oC.

On the effect of turbulence models on CFD simulations of a counter-current spray drying process

2019 ◽  
Vol 141 ◽  
pp. 592-607 ◽  
Author(s):  
Hasan Jubaer ◽  
Sepideh Afshar ◽  
Jie Xiao ◽  
Xiao Dong Chen ◽  
Cordelia Selomulya ◽  
...  
Keyword(s):  
Spray Drying ◽  
Turbulence Models ◽  
Drying Process ◽  
Cfd Simulations ◽  
Counter Current

scholarly journals Viability of Bifidobacterium Pseudocatenulatum G4 after Spray-Drying and Freeze-Drying

2010 ◽  
Vol 3 ◽  
pp. MBI.S2728 ◽  
Author(s):  
Stephenie Wong ◽  
Barka Mohammed Kabeir ◽  
Shuhaimi Mustafa ◽  
Rosfarizan Mohamad ◽  
Anis Shobirin Meor Hussin ◽  
...  
Keyword(s):  
Spray Drying ◽  
Freeze Drying ◽  
Skim Milk ◽  
The Other ◽  
Outlet Temperature ◽  
Residual Moisture Content ◽  
Drying Process ◽  
Residual Moisture ◽  
Heat Adaptation ◽  
C 30

Viability of Bifidobacterium pseudocatenulatum G4 following spray-drying and freeze-drying in skim milk was evaluated. After spray-drying, the strain experienced over 99% loss in viability regardless of the air outlet temperature (75 and 85 °C) and the heat-adaptation temperature (45 and 65 °C, 30 min). The use of heat-adaptation treatment to improve the thermotolerance of this strain was ineffective. On the other hand, the strain showed a superior survival at 71.65%–82.07% after freeze-drying. Viable populations of 9.319–9.487 log10 cfu/g were obtained when different combinations of skim milk and sugar were used as cryoprotectant. However, the addition of sugars did not result in increased survival during the freeze-drying process. Hence, 10% (w/v) skim milk alone is recommended as a suitable protectant and drying medium for this strain. The residual moisture content obtained was 4.41% ± 0.44%.

Survival of Listeria monocytogenes During the Manufacture and Storage of Nonfat Dry Milk

1985 ◽  
Vol 48 (9) ◽  
pp. 740-742 ◽  
Author(s):  
MICHAEL P. DOYLE ◽  
LOUISE M. MESKE ◽  
ELMER H. MARTH
Keyword(s):  
Listeria Monocytogenes ◽  
Spray Drying ◽  
Skim Milk ◽  
Inlet Temperature ◽  
Outlet Temperature ◽  
Drying Process ◽  
Dry Milk ◽  
Nonfat Dry Milk ◽  
And Storage ◽  
Moisture Resistant

The ability of Listeria monocytogenes to survive in skim milk during spray drying and to persist in nonfat dry milk during storage was examined. Concentrated (30% solids) and unconcentrated skim milks were inoculated with ca. 105 to 106 L. monocytogenes/ml and spray dried (inlet temperature, 165 ± 2°C; outlet temperature 67 ± 2°C) to a moisture content of 3.6 to 6.4%. The nonfat dry milk was packaged in moisture-resistant film and stored at 25°C for up to 16 wk. A reduction of ca. 1 to 1.5 log10 L. monocytogenes/g occurred during the spray drying process, irrespective of whether the milk was concentrated or not before spray drying. The organism progressively died during storage at 25°C, with a >4-log10 CFU/g decrease occurring within 16 wk of storage.

CFD Simulations of Copper-Ceria Based Microreactor for COPROX

2016 ◽  
Vol 14 (6) ◽  
pp. 1301-1313 ◽  
Author(s):  
Paola Sabrina Barbato ◽  
Gianluca Landi ◽  
Luciana Lisi ◽  
Almerinda Di Benedetto
Keyword(s):  
Thermal Conductivity ◽  
Co Oxidation ◽  
Hot Spot ◽  
Temperature Profiles ◽  
Cfd Model ◽  
Cfd Simulations ◽  
Co Preferential Oxidation ◽  
Co Conversion ◽  
Control And Management ◽  
Micro Reactor

Abstract A CFD model of a copper-ceria based micro-reactor for the CO preferential oxidation reaction is developed. Simulations are performed by changing the thermal conductivity of the support and the oxygen inlet concentration. It is found that the value of the wall thermal conductivity has a significant role on the temperature profiles, hot-spot and selectivity. On increasing the O2 content, the CO selectivity decreases. An increase of the oxygen content anticipates the activation of the H2 oxidation, thus competing with CO oxidation. Conversely, at low values of the O2 content, the H2 oxidation is activated only after an almost complete CO oxidation is obtained. From the results it appears that the temperature control and management in the reactor is a key for increasing the CO selectivity at high CO conversion.

The Effect of Inlet Temperature on the Wall Temperature Behavior of Salt Powders Produced by Spray-Drying

2012 ◽  
Vol 550-553 ◽  
pp. 704-708 ◽  
Author(s):  
Cherdpong Chiawchanwattana ◽  
Kittichai Triratanasirichai
Keyword(s):  
Spray Drying ◽  
Wall Temperature ◽  
Prediction Equation ◽  
Temperature Behavior ◽  
Inlet Temperature ◽  
Deposition Flux ◽  
Temperature Profiles ◽  
Drying Process ◽  
State Process ◽  
Significant Difference

This research is concerned with the experimental study of the wall temperature behavior of salt powders in the spray-drying process under various inlet temperatures. The results are presented and discussed in terms of the temperature profiles within two sections of the drying chamber that consists of cylindrical and conical sections. Firstly, the temperature profiles of cylindrical section have shown that the behavior from the steps of spraying air, water, and solution before has lead to a steady state process. Finally, the wall temperature distribution at each elevation has shown a statistically significant difference. In our future work, the wall temperature behavior will be compared with the wall deposition flux in order to determine a prediction equation that can be applied to manage the deposition problem in the spray-drying process stage.

scholarly journals Optimization of inulin production process parameters using response surface methodology

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Wasim Akram ◽  
Navneet Garud
Keyword(s):  
Response Surface ◽  
Spray Drying ◽  
Product Yield ◽  
Drying Methods ◽  
Process Variables ◽  
Drying Process ◽  
Uniform Size ◽  
Drying Temperature ◽  
Yield Value ◽  
Internal Configuration

Abstract Background Chicory is one of the major source of inulin. In our study, Box–Behnken model/response surface analysis (RSM) was used for the optimization of spray drying process variables to get the maximum inulin yield from chicory (Cichorium intybus L.). For this investigation, the investigational plan utilized three process variables drying temperature (115–125 °C), creep speed (20–24 rpm), and pressure (0.02–0.04 MPa). Result The optimal variables established by applying the Box–Behnken model were as follows: drying temperature 119.20 °C, creep speed 21.64 rpm, and pressure 0.03 MPa. The obtained powdered inulin by spray drying was investigated for the yield value, identification, size, and surface morphology of the particle. The inulin obtained from the spray drying process consists of a fine molecule-sized white powder. Instead, the drying methods shows a significant effect on the morphology and internal configuration of the powdered inulin, as the inulin obtained from spray drying was of a widespread and uniform size and shape, with a rough surface on increase in temperature and smoother surface while increasing the creep speed. The findings indicate that the spray drying with optimum parameters resulted in maximum product yield. Conclusion The outcomes of the study concluded that the product yield through spray drying technique under optimized condition is optimal as compared to other drying technique. Hence, this technique may be applied at commercial scale for the production of inulin.

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