Enhanced methods for experimental investigation of single droplet drying kinetics and application to lactose/water

Tran, Thi Thu Hang; Ávila-Acevedo, José Guillermo; Tsotsas, Evangelos

doi:10.1080/07373937.2015.1100202

Cited by 37 publications

(22 citation statements)

References 26 publications

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“…A significant difference in droplet/particle diameter changes was noted at drying air temperatures below and above 100°C (Figure b). The trend of the droplet/particle diameter curves was approximately like the drying air temperatures of 80°C and 100°C (normalized diameter was decreased with time and reached approximately 0.68 and 0.76 for temperatures of 80°C and 100°C, respectively) and for drying air temperatures of 140°C and 160°C, confirmed by the observations of Tran et al for SDD of lactose solutions. However, a considerable difference exists between higher (140°C and 160°C) and lower air temperature (100°C).…”

Section: Resultsmentioning

confidence: 99%

“…The particle shrinkage was less at the higher drying air temperature and higher initial solid content, which might be related to an inflation/deflation phenomenon that might have happened at air temperatures above 100°C. 18,34 During the inflation/deflation, the crust that formed on the droplet/particle surface was forced outwards due to an increase of internal pressure inside the wet particle until the water vapor escaped to the ambient. 35 A stronger volume expansion 35 in the inflation/deflation cycles might lead to a severe collapse 18 at a low initial solid content (15%, 140°C), and therefore, a dented particle surface was obtained.…”

Section: Effect Of Initial Solid Contentmentioning

confidence: 99%

“…18,34 During the inflation/deflation, the crust that formed on the droplet/particle surface was forced outwards due to an increase of internal pressure inside the wet particle until the water vapor escaped to the ambient. 35 A stronger volume expansion 35 in the inflation/deflation cycles might lead to a severe collapse 18 at a low initial solid content (15%, 140°C), and therefore, a dented particle surface was obtained. However, at a higher initial solid content, a smooth particle surface was obtained due to the resulting shell that could prevent the volume expansion, thus avoiding the particle collapse.…”

Section: Effect Of Initial Solid Contentmentioning

confidence: 99%

“…The single droplet is suspended by an intrusive method (filament, thermocouple) or a nonintrusive method (free‐flying droplet and acoustic levitation) . In addition, a recent method involving a single sessile droplet, deposited on a flat surface to derive its drying behavior, has been suggested …”

Section: Introductionmentioning

confidence: 99%

“…The single droplet is suspended by an intrusive method (filament, thermocouple) or a nonintrusive method (free-flying droplet and acoustic levitation). 13,17,18 In addition, a recent method involving a single sessile droplet, deposited on a flat surface to derive its drying behavior, has been suggested. 13 The SDD technique represents an easy approach to investigate in situ droplet drying because the SDD technique is capable of generating quantitative data having a prominent importance to the development of spraydrying processes 19 such as kinetics parameters and indices (mass, temperature, diameter and rheological changes, and surface formation of the droplet/particle).…”

Section: Introductionmentioning

confidence: 99%

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Impact of operating conditions on a single droplet and spray drying of hydroxypropylated pea starch: Process performance and final powder properties

Gouaou

Shamaei

Koutchoukali

et al. 2018

Asia-Pacific J Chem Eng

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For an efficient production of spray‐dried fine powders having controllable properties (size, size distribution, and morphology), finding suitable operating conditions and an appropriate initial composition of the fluid material is important. For this purpose, a suspension device is employed to investigate the drying kinetics of a single droplet of hydroxypropylated pea starch (HPS). In the current work, the effect of the drying air temperature (80–160°C) and of the initial solid content of the agent (15–30%w/w) on the drying kinetics, shrinkage, and locking point of a single droplet was systematically investigated to acquire the optimal conditions required for producing HPS powder using a pilot‐scale spray dryer. In addition to the previously mentioned parameters, the atomization pressure effect (2–3 bars) on the spray‐drying process yield, thermal efficiency, and final powder properties were also considered. A laboratory‐scale X‐ray microtomograph and a camsizer‐XT were employed for the acquisition of three‐dimensional images and surface morphology of single dried particles and spray‐dried powder, respectively. Hollow particles were obtained in all single droplet experiments. The drying kinetic study results were supported by those obtained by the spray drying of HPS. An increased temperature of the drying air and the initial solid content of the solution results in higher powder recovery, lower residual moisture content, and larger particle size. Otherwise, the final particles are larger at a decreased atomization pressure. The optimized parameters for the high spray‐drying process yield (24.54%; 3 bars, 140°C, 25 wt%) and better powder homogeneity (span = 2.31; 3 bars, 140°C, 20 wt%) were defined. A mixture of particle morphologies was observed among the different final powders. A broken shell corresponding to rigid particles was obtained at a drying temperature of 140°C and an initial solid content of 25 wt%. A nonbroken particle refers to a pliable particle that corresponds to inflated and collapsed particles dried at high and low drying temperatures.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of Initial Solid Contentmentioning

confidence: 99%

Section: Effect Of Initial Solid Contentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Impact of operating conditions on a single droplet and spray drying of hydroxypropylated pea starch: Process performance and final powder properties

Gouaou

Shamaei

Koutchoukali

et al. 2018

Asia-Pacific J Chem Eng

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Experimental investigation of the morphology of salt deposits from drying sessile droplets by white‐light interferometry

Sondej

Peglow

Bück³

et al. 2018

AIChE Journal

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This study presents a new approach to investigate the drying behavior and the structure of deposit resulting from drying of solid containing micro droplets. It is shown that deposit structure (porosity and "footprint") depends on drying conditions. This dependency may contribute to better understanding of particle-forming processes, such as fluidized bed coating. In the framework of this study, sessile droplets containing sodium benzoate dissolved in water were dried on thin glass plates in a small drying chamber. The drying conditions (temperature, moisture content and flow rate of drying gas) and material parameters (solid content of solution) were systematically varied. The drying rate of droplets was determined from the moisture balance of the drying gas. The final three-dimensional shape of dried sessile droplets was measured using white-light interferometry and transformed into a two-dimensional profile using a Monte Carlo method. Moreover the mean porosity of dried droplets was calculated. By comparison of structural information and process conditions it is shown that the drying process may have a large influence on deposit structure. T g,in , gas inlet temperature; _ V air , gas volume flow rate; Y in , inlet air moisture content; c s , initial solid mass fraction.

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Simulation and design of spray driers

Jaskulski,

Wawrzyniak

2024

Spray Drying for the Food Industry

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Enhanced methods for experimental investigation of single droplet drying kinetics and application to lactose/water

Cited by 37 publications

References 26 publications

Impact of operating conditions on a single droplet and spray drying of hydroxypropylated pea starch: Process performance and final powder properties

Impact of operating conditions on a single droplet and spray drying of hydroxypropylated pea starch: Process performance and final powder properties

Experimental investigation of the morphology of salt deposits from drying sessile droplets by white‐light interferometry

Simulation and design of spray driers

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