Computational Study of Ultrasound‐Assisted Drying of Food Materials

Riera, Enrique; García-Pérez, J.V.; Cárcel, Juan A.; Acosta, Víctor M.; Gallego-Juárez, J.A.

doi:10.1002/9780470959435.ch13

Cited by 34 publications

(31 citation statements)

References 52 publications

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“…Compared with the D eff value of HAD at 40°C, the D eff values of UHAD increased 8.9 %, 16.6 %, 24.3 % and 35.8 % at ultrasonic powers of 40, 80, 120 and 160 W, respectively, and the improvement of D eff was reduced to 5.5 %, 9.6 %, 13.1 % and 19.2 % at 70°C, which means that the effect of ultrasonic power on D eff values decreases with the increase of drying temperature. Since the large number of thermal energy are available in drying medium at high temperatures, the ratio of ultrasound energy over total energy could almost be negligible (Riera et al 2011).…”

Section: Drying Characteristicsmentioning

confidence: 99%

Drying characteristics of ultrasound assisted hot air drying of Flos Lonicerae

et al. 2014

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Ultrasound assisted hot air drying of Flos Lonicerae was investigated in this study. The effects of drying parameters such as ultrasonic radiation distance, ultrasonic power and drying temperature on drying characteristics were discussed. The results showed that ultrasound application has positive and significant effects on hot air drying. Shortening ultrasonic radiation distance is beneficial to improve both ultrasonic energy efficiency and drying rate. Higher ultrasonic power had more positive and significant effects on drying rate. The influence of ultrasound power on drying rate decreased along with the decrease of moisture content during drying process, especially at low ultrasound powers. The increase of drying temperature significantly caused the reduction of drying time. D eff values ranged from 5.05 × 10 -11 to 20.33×10 −11 m 2 /s in ultrasound assisted hot air drying of Flos Lonicerae, and increased with the increase in drying temperature and ultrasonic power. The corresponding activation energy values ranged from 28.90 to 36.05 kJ/mol, and decreased with the increase in applied ultrasonic power. Therefore, ultrasound assistance is a helpful and promising method to enhance hot air drying process.

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Section: Drying Characteristicsmentioning

confidence: 99%

Drying characteristics of ultrasound assisted hot air drying of Flos Lonicerae

et al. 2014

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“…In such a way, the product also keeps frozen during drying and water 83 removal occurs mainly by sublimation. The introduction of new technologies with high 84 heating effect, such as microwave, radio-frequency and infrared radiation, should be 85 avoided if possible due to the risk of overheating and product thawing with the 86 subsequent reduction of the dry product quality (Riera et al, 2011). Therefore, to avoid 87 this risk without a costly strict control of the process, non thermal strategies are mostly 88 required for this process intensification, like the application of power ultrasound.…”

Section: Introduction 56mentioning

confidence: 99%

“…From the previous studies, it 94 was concluded that an efficient power ultrasound application produce mechanical 95 effects both on the gas-solid interfaces and in the material being dried. Thus, 96 ultrasound may intensify water removal without introducing a high amount of thermal 97 energy during drying (Riera et al, 2011). Therefore, the use of power ultrasound either 98 to dry heat sensitive materials or to be applied in low-temperature drying processes 99 has great potential that needs to be investigated (Garcia-Perez, 2007).…”

Section: Introduction 56mentioning

confidence: 99%

Intensification of Low-Temperature Drying by Using Ultrasound

et al. 2012

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28Low temperature air drying involves temperatures below or close to the freezing point 29 and aims to reduce the water content or to remove organic solvents keeping quality 30 attributes, thus it has a great potential in food, chemical, pharmaceutical and cosmetic 31 industries. Depending on the temperature and solvent involved, the removal is by 32 evaporation or sublimation, but in all cases, the drying process is slow due to the low 33 temperature used. An efficient ultrasound application at atmospheric pressure and 34 moderate temperatures could accelerate the drying process. Thus, the main aim of this 35 work was to test the feasibility of power ultrasound to intensify low temperature drying 36 processes. 37Drying kinetics of carrot, eggplant and apple cubes (side 10 mm) were carried out at 38 atmospheric pressure, 2 m/s, -14 ºC and relative humidity 7% with (acoustic power 39 19.5 kW/m 3 ) and without ultrasound application. At the same experimental conditions, 40 kinetics of ethanol removal from a solid matrix were also performed. Diffusion models 41 were used to describe drying curves and identify kinetic parameters in order to 42 evaluate and quantify the process intensification attained by ultrasound application. 43The effect of ultrasound application was similar for all products tested, being drying 44 time shortened between 65-70 %. In the case of ethanol removal, the time reduction by 45 ultrasound application was even higher achieving 120 %. Both, effective moisture 46 diffusivity and mass transfer coefficient increased from 96 to 170 % and from 407 to 47 428 % when ultrasound was applied, respectively. Therefore, ultrasound application 48 should be considered a potential and effective technology to intensify low temperature 49 drying processes, being capable to make more affordable and less energy and time-50 consuming these processes for all kind of industries.

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“…The first step was the numerical analysis of this transducer with a finite element model, following the indications of (Riera et al, 2011).…”

Section: Design Of the Circular Plate Transducermentioning

confidence: 99%

“…The developing process of a high-power ultrasonic transducer with extensive radiator can be divided in several stages: design of the transducer using numerical methods (Riera et al, 2011), stability tests and nonlinear characterization of the devices Andrés et al, 2015) and determination of the ultrasonic field generated by the radiator by numerical and/or experimental methods (Elvira et al, 1993).…”

Section: Introductionmentioning

confidence: 99%