Mathematical description of heat and mass transfer during deep bed drying: Effect of product shrinkage on bed porosity

Bennamoun, Lyes; Belhamri, Azeddine

doi:10.1016/j.applthermaleng.2008.01.001

Cited by 44 publications

(18 citation statements)

References 41 publications

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“…The sizing of a drying plant (KALETA; GÓRNICKI, 2010) and the prediction of a drying performance over time (BENNAMOUN;BELHAMRI, 2008) can be obtained through a drying mathematical simulation.…”

Section: Introductionmentioning

confidence: 99%

Drying of macaw palm fruits and its influence on oil quality

Silva

Evaristo

Grossi

et al. 2017

SCA

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After harvest, macaw palm fruits show high deterioration rates when improperly preserved. A possible cause is the high fruit water content favoring enzymatic and microbiological degradation. Therefore, this study aimed to evaluate the effect of drying on the mesocarp oil quality during storage and to set the drying curve of macaw palm fruits. For that, two experiments were carried out. In the first, the drying curve of macaw palm fruits was determined at 60 °C, and mathematical models were defined for the process. Drying was performed with freshly harvested fruits (S0) and with fruits stored for 20 days after harvest (S20). Fruits were stored for 20 days after harvested and then went through drying. The fruits were dried in a prototype dryer at 60 °C. After drying, the fruits were stored for different periods (0, 15, 30, 45, 60, and 90 days) and evaluated for oil physicochemical parameters. When compared to S0, drying of macaw palm fruits in the S20 treatment showed a lower drying time until equilibrium moisture was reached. In general, all the mathematical models tested were adequate to describe the drying process. Fruits dried at 60 °C controlled mesocarp oil acidification for up to 90 days in storage. On the other hand, drying impaired the mesocarp oil oxidative stability. We may conclude that the drying process is efficient to maintain acidity during the storage of macaw palm fruits. Key words: Acrocomia aculeate. Temperature. Mathematical models. Postharvest. Biodiesel. ResumoFrutos de macaúba apresentam elevada deterioração quando não conservados adequadamente após a colheita. Uma possível causa é o elevado teor de água nos frutos, o que pode favorecer a degradação enzimática e microbiológica dos frutos. Diante do exposto, objetivou-se com esse estudo avaliar o efeito da secagem na manutenção da qualidade do óleo do mesocarpo durante o armazenamento e determinar a curva de secagem de frutos de macaúba. Para isso, realizou-se dois experimentos. No primeiro, determinou-se a curva de secagem dos frutos de macaúba na temperatura de 60 °C e definiu-se modelos matemáticos para o processo. A secagem foi realizada com frutos recém colhidos (S0) e frutos armazenados durante 20 dias após a colheita (S20). Após a colheita os frutos foram armazenados durante 20 dias, após esse período foi realizado o processo de secagem. Os frutos foram secos em um secador protótipo a temperatura de 60°C. Após a secagem, os frutos foram armazenados por diferentes períodos (0, 15, 30, 45, 60 e 90 dias) e avaliados quanto aos parâmetros físico-químicos do óleo. A secagem dos frutos de macaúba no tratamento S20, apresentou menor tempo de secagem até atingir umidade de equilíbrio comparado a S0. Em geral, todos os modelos matemáticos testados foram adequados para descrever o processo de secagem. Frutos secos a 60°C promoveu controle da acidificação do óleo do mesocarpo por até 90 dias em armazenamento. Por outro lado, a secagem prejudicou a estabilidade oxidativa do óleo do mesocarpo. Conclui-se que o processo de secagem é eficien...

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Section: Introductionmentioning

confidence: 99%

Drying of macaw palm fruits and its influence on oil quality

Silva

Evaristo

Grossi

et al. 2017

SCA

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“…So, mathematical model describing transfer in porous media can be applied for the product, represented by the solid phase, and the heated air, presented as the gas phase. We obtain four differential equations [4,13,51].…”

Section: Solar Drying Of Thick Layersmentioning

confidence: 99%

“…Influence of flow rate and initial humidity on humidity of the heated air [54] Some studies have shown that thick layer dry ing is also done in a non-homogeneous manner. The temperature and drying kinetic was affected by many parameters, such as the initial humidity of the air, the flo w rate and the height of the bed (Figure 8 and 9) [51,54]. A representation of the efficiency is shown in Figure 10, with variation in time and height of the bed.…”

Section: Solar Drying Of Thick Layersmentioning

confidence: 99%

“…These equations are obtained after considering the following simplifications [51]: the walls of the drying chamber are considered as adiabatic, the product is immob ile and the isotropic. Also, we consider that the air is flo wing in one direction.…”

Section: Solar Drying Of Thick Layersmentioning

confidence: 99%

“…By this method, drying chamber efficiency can be calcu lated, well known as pick up efficiency, written [51][52][53]:…”

Section: Application To the Dry Ing Chambermentioning

confidence: 99%

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The main objective of this work is to give an overview of the different used mathematical methods for modeling and calculating the energy and exergy efficiency of a solar dry ing system. For determination of the energy efficiency of thin or thick layers, heat and mass balances are established to the different co mponents. In the case of thick layers equations of porous med ia are used. These methods allow fo llo wing, in particular, the variat ions of the heated air and the product temperature and humidity. As a second part, the common way for the calculus of the exergetic efficiency passes through the establishment of exergy balance and after calculating the input, output and exergy loss. The influence and illustration of several parameters are as well presented in this paper.

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Mathematical description of heat and mass transfer during deep bed drying: Effect of product shrinkage on bed porosity

Cited by 44 publications

References 41 publications

Drying of macaw palm fruits and its influence on oil quality

Drying of macaw palm fruits and its influence on oil quality

An Overview on Application of Exergy and Energy for Determination of Solar Drying Efficiency

Mass Transfer in a Porous Medium: Multicomponent and Multiphase Flows

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