Pneumatic Drying of Meals: Application of the Variable Diffusiv1ty Model

Álvarez, Pedro; Blasco, R.

doi:10.1080/07373939908917570

Cited by 13 publications

(5 citation statements)

References 1 publication

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“…The experimental difficulties involved in obtaining drying kinetics in pneumatic conveying are common in the literature, and the use of analogies was also adopted by Pelegrina and Crapiste [10] and Skuratovsky et al [11,12] . Alvarez and Blasco [27] developed a technique for the experimental determination of drying kinetics in pneumatic conveying and presented the results in a curve of solids moisture content as a function of time. Their conditions were very different from those of this work and their results could not be applied here.…”

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confidence: 99%

Drying of Coarse Particles in a Vertical Pneumatic Conveyor

2007

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In the present work, one-dimensional two-phase continuum models were applied to simulate the pneumatic drying of porous alumina and solid glass particles. Pressure profiles, gas and solid temperature, and gas and solids moisture profiles were obtained in a 53.4-mm conveying tube. For both particles, maximum values of gas-to-particle heat transfer coefficients were obtained at air velocities close to the minimum pressure gradient velocity. Experimental temperature and moisture profiles of gas and solids were compared to simulated predictions, showing that models based on the twophase flow approach fail to predict all the observed physical phenomena in simultaneous momentum, heat, and mass transfer for pneumatic drying of coarse particles. However, using adequate correlations and constitutive equations to predict interaction forces and transport parameters, it was possible to obtain good predictions of gas and solid temperature profiles and of moisture content.

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confidence: 99%

Drying of Coarse Particles in a Vertical Pneumatic Conveyor

2007

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“…[1,[4][5][6] Kaensup et al, [1] for example, investigated the use of pneumatic drying for paddy and found that the moisture content of paddy could be rapidly decreased, especially at a higher inlet air temperature. Nevertheless, pneumatic drying suffers from some drawbacks; in particular, in terms of excessive cracks and discoloration of dried paddy kernels.…”

Section: Introductionmentioning

confidence: 98%

Comparative Evaluation of Hot-Air and Superheated-Steam Impinging Stream Drying as Novel Alternatives for Paddy Drying

et al. 2013

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An investigation was conducted on impinging stream drying of moist paddy using hot air and superheated steam as the drying media. Drying experiments were divided into two parts: namely, one-pass and two-pass drying. The volumetric water evaporation rate, volumetric heat transfer coefficient, and specific energy consumption of the drying system at various conditions were assessed; in the case of superheated-steam drying, the effect of steam recycle was also assessed. The quality of dried paddy was evaluated in terms of color, head rice yield, and degree of starch gelatinization. In the case of one-pass drying, an increase in the drying temperature led to a significant increase in the volumetric water evaporation rate and volumetric heat transfer coefficient. On the other hand, in the case of two-pass drying, an increase in the drying temperature led to a significant decrease in the volumetric heat transfer coefficient; the volumetric water evaporation rate was not significantly affected, however. The specific energy consumption decreased with an increase in the drying temperature. At the same temperature, using superheated steam as the drying medium led to lower specific energy consumption; higher level of steam recycle also led to more energy conservation. The color of the dried paddy was not affected by the change in the drying temperature; superheated-steam-dried paddy was redder and more yellow than the hot-air-dried paddy. An increase in the drying temperature led to decreased percentage of head rice yield. Superheated-steam drying helped enhance the level of starch gelatinization in comparison with hot-air drying at the same temperature. Nevertheless, drying at the highest tested temperature led to a lower level of starch gelatinization.

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“…The pneumatic dryer is a traditional means that can be adopt as a first-stage dryer to quickly remove surface moisture from a particulate material including paddy. The pneumatic dryer has successfully been used to dry various high-moisture materials [1][2][3][4][5][6]. For application to paddy, Kaensup et.…”

Section: Introductionmentioning

confidence: 99%

Rapid Drying of High-Moisture Paddy Using a Pneumatic Dryer with Corrugated-Surface Drying Column

2020

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Combination of corrugated-surface drying column and multipass drying concept (first-pass and second-pass drying) was made to increase the performance of a pneumatic dryer for high-moisture paddy. In this study, different characteristics of the drying column, which could be characterized by the ratio between the corrugated-surface length (C) and the total length (L) of the drying column (or C/L), were proposed. The influences of drying temperature (120oC, 150oC, and 180oC) and value of C/L (0, 0.5 and 1.0) on the dryer performance and energy utilization of the drying process were disscussed. The drying column with a higher value of C/L had higher potential for increasing dryer performance. For the first-pass drying, the drying system using the drying column with corrugated surface could reduce the energy consumption by 14% to 44% compared with the drying system using the drying column without corrugated surface. For the second-pass drying, the drying system using the drying column with corrugated surface consumed more energy, however. The moisture reduction of paddy could also be significantly increased after the second-pass drying.

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Pneumatic Drying of Meals: Application of the Variable Diffusiv1ty Model

Cited by 13 publications

References 1 publication

Drying of Coarse Particles in a Vertical Pneumatic Conveyor

Drying of Coarse Particles in a Vertical Pneumatic Conveyor

Comparative Evaluation of Hot-Air and Superheated-Steam Impinging Stream Drying as Novel Alternatives for Paddy Drying

Rapid Drying of High-Moisture Paddy Using a Pneumatic Dryer with Corrugated-Surface Drying Column

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