Heat pump drying kinetics of a pressed type cheese

Castell-Palou, Á.; Simal, Susana

doi:10.1016/j.lwt.2010.09.007

Cited by 20 publications

(11 citation statements)

References 27 publications

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“…SEM images confirm, therefore, that SB is a low-porous material. According to Castell-Palou & Simal [16], on non-porous materials water is vaporized from the surface to the atmosphere, while at the same time, moisture diffuses through the solid particle to the surface.…”

Section: Sb Biomass Characterizationmentioning

confidence: 99%

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Assessment of drying temperature of sugarcane bagasse on sorption of reactive blue 5G dye

Scheufele

Ribeiro²,

Módenes³

et al. 2015

Fibers Polym

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We studied the effect of drying temperature of sugarcane bagasse (SB) on sorption of reactive blue 5G (RB5G) dye to test whether SB is a suitable biosorbent for industrial dye removal. First we assessed a set of SB characteristics that could influence the sorption capacity of dried biomass. Kinetic drying of the SB biomass was measured at different drying temperatures, ranging from 30 o C to 80 o C. We used a static gravimetric method to perform equilibrium moisture sorption experiments at drying temperatures of 35-65 o C. In addition, we measured activation energy and net isosteric heat of sorption. SB biomass was characterized as a heterogeneous low-porous and hygroscopic material, with a series of functional groups on its surface. A Lewis thin-layer model best represented the kinetic drying data. In addition, moisture diffusion into the SB biomass was characterized by a rate-controlling step in the drying process. Equilibrium moisture sorption data showed the expected effects of temperature controlling the sorption capacity and a multilayer sorption process. A sigmoidal sorption isotherm data was best represented by a BET model. A high energy demand is required for moisture removal from biomass as suggested by the measured isosteric heat of moisture sorption. Drying temperature did not influence the RB5G adsorption capacity of bagasse, therefore any drying temperature in the range of 30 o C to 80 o C could be used to make this material feasible as an industrial adsorbent.

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Section: Sb Biomass Characterizationmentioning

confidence: 99%

“…The process of drying high moisture materials is complex, involving simultaneous mass and heat transfer [15,16]. Fick's Law of Diffusion describes drying organic materials, where effective moisture diffusivity (D eff ) represents the conductive term of all mass transfer mechanisms [17,18].…”

Section: Introductionmentioning

confidence: 99%

Assessment of drying temperature of sugarcane bagasse on sorption of reactive blue 5G dye

Scheufele

Ribeiro²,

Módenes³

et al. 2015

Fibers Polym

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“…D e determines the water's ability to move inside the material (Castell-Palou and Simal, 2011). It is an intrinsic and structural property of the material, but, due to its kinetic aspect, it is also influenced by external factors, like temperature.…”

Section: 2drying Process Modellingmentioning

confidence: 99%

Moisture loss kinetics and microstructural changes in eggplant (Solanum melongena L.) during conventional and ultrasonically assisted convective drying

Puig

Pérez‐Munuera

Cárcel

et al. 2012

Food and Bioproducts Processing

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20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 2 ABSTRACTThe overall aim of this study was to assess the moisture loss kinetics and the structural changes induced by both conventional and ultrasonically assisted convective drying of eggplant tissue. Three sets of drying experiments (at 40 ºC and 1 m/s) were carried out:conventional air drying and ultrasonically assisted drying at two different levels of applied ultrasonic power, 45 and 90 W. The microstructure of the dried samples was studied by Scanning Electron Microscopy.The application of ultrasound during the convective drying of eggplant led to a significant reduction of the drying time. The ultrasonic effect was dependent on the power applied, thus, the higher the power, the faster the moisture loss. The microstructure of eggplant endocarp was greatly affected during conventional air drying, probably due to the long drying times. This microstructure was better preserved after the application of a moderate ultrasonic power (45 W), due to the shorter drying time and the mild mechanical effects of ultrasound on the endocarp cells.

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“…O processo de secagem de materiais de alta umidade é complexo, envolvendo transferência simultânea de calor e massa (Ghazanfari et al 2006;Castell-Palou & Simal, 2011), no entanto em determinados materiais a secagem pode ser limitada pela difusão no interior da partícula. Nestas situações a equação da difusão de Fick, dada pela Equação (6), pode descrever o processo, na qual a difusividade efetiva (Deff) é um parâmetro que representa o termo condutivo de todos os mecanismos de transferência de massa.…”

Section: Difusividade Efetiva E Energia De Ativaçãounclassified

“…A redução da atividade de água, evita a proliferação de micro-organismos que possam vir a degradar ou alterar as características do material (Ghazanfari et al 2006;Castell-Palou & Simal, 2011). Além disso, no caso do emprego como material adsorvente é fundamental a retirada da umidade, pois as moléculas de água ligadas à superfície podem prejudicar o processo sortivo.…”

Section: Introductionunclassified

Avaliação Da Cinética E Equilíbrio Da Secagem Do Bagaço De Cana-De-Açúcar Para Aplicação Como Adsorvente

Scheufele¹,

Diório²,

Módenes³

et al. 2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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RESUMO -Este trabalho teve como objetivo a avaliação da cinética e equilíbrio do processo de secagem do bagaço com a finalidade de melhorar a sua eficiência num processo de remoção do corante têxtil. Os experimentos de cinética foram realizados em estufa com circulação de ar, em camada fina. O equilíbrio de sorção de umidade foi determinado pelo método estático, entre 35 e 65°C. Para todas as temperaturas avaliadas, o processo de secagem apresentou período de taxa de secagem decrescente, o qual foi melhor representado pelo modelo Dois Termos. Os valores de difusividade variaram entre 6,47.10 -9 e 3,97.10 -8 m 2 s -1 e a energia de ativação foi 30,20 kJ mol -1 . Os dados de equilíbrio apresentaram dependência da temperatura, com isotermas no formato sigmoidal melhor representados pelo modelo de Oswin. Em todas as temperaturas avaliadas, o processo de secagem apresentou cinética favorável, viabilizando sua utilização como adsorvente.

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Heat pump drying kinetics of a pressed type cheese

Cited by 20 publications

References 27 publications

Assessment of drying temperature of sugarcane bagasse on sorption of reactive blue 5G dye

Assessment of drying temperature of sugarcane bagasse on sorption of reactive blue 5G dye

Moisture loss kinetics and microstructural changes in eggplant (Solanum melongena L.) during conventional and ultrasonically assisted convective drying

Avaliação Da Cinética E Equilíbrio Da Secagem Do Bagaço De Cana-De-Açúcar Para Aplicação Como Adsorvente

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