Shrinkage, effective diffusion coefficient, surface transfer coefficients and their factors during solar drying of food products – A review

Mugi, Vishnuvardhan Reddy; Chandramohan, V.P.

doi:10.1016/j.solener.2021.07.042

Cited by 31 publications

(13 citation statements)

References 98 publications

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“…The effective diffusivity or coefficient of effective diffusion was determined based on the liquid diffusion theory according to Fick's law, considering a geometric form similar to an infinite flat plate, and using an analytical solution with close to 9 terms (Mugi & Chandramohan, 2021) (Equation 17).

RX goodbreak= \frac{normalX - X_{e}}{X_{i} - X_{e}} goodbreak= \frac{8}{{normalπ}^{2}} \sum_{normaln - 0}^{\infty} \frac{1}{{()(, 2 normaln goodbreak+ 1)}^{2}} \exp (][, goodbreak- {(2 n + 1)}^{2} π^{2} D_{ef} \frac{t}{{normalL}^{2}})

where: RX – the rate of water loss (non‐dimensional); D ef – the effective diffusivity (m 2 /s); n – the number of terms in the equation; L – the thickness of the plate (m); t – time (s).…”

Section: Methodsmentioning

confidence: 99%

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Thermodynamic properties and bioactive compounds of mandacaru dried waste

Gondim

Figueirêdo

Queiroz

et al. 2022

Food Processing Preservation

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Mandacaru is a cactus native to the semiarid region of Brazil, of which the fruits are edible, highly perishable and rich in bioactive compounds, present mainly in the peel.The aim of this study was to determine the drying kinetics of the processed peels of the mandacaru fruit at three different temperatures, fit mathematical models to the experimental data, determine the effective diffusivity and the thermodynamic properties and evaluate the influence of the drying conditions on the bioactive compound concentrations. The residues from the mandacaru fruits, composed of the peels, were ground with a 3% ascorbic acid solution to transform them into a homogeneous paste.

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RX goodbreak= \frac{normalX - X_{e}}{X_{i} - X_{e}} goodbreak= \frac{8}{{normalπ}^{2}} \sum_{normaln - 0}^{\infty} \frac{1}{{()(, 2 normaln goodbreak+ 1)}^{2}} \exp (][, goodbreak- {(2 n + 1)}^{2} π^{2} D_{ef} \frac{t}{{normalL}^{2}})

Section: Methodsmentioning

confidence: 99%

Section: Effective Diffusivitymentioning

confidence: 99%

Thermodynamic properties and bioactive compounds of mandacaru dried waste

Gondim

Figueirêdo

Queiroz

et al. 2022

Food Processing Preservation

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“…The fluid-phase energy transport equation 27,29−31 is given by (6) where K ef f is the effective thermal conductivity of air, S pf T and S f w T are the source terms caused by the heat flux, water evaporation, and wall heat flux, and C f is the specific heat capacity of air.…”

Section: Cfd-dem Modelmentioning

confidence: 99%

“…In drying phase (c), the intraparticle moisture diffusion, governed by Fick's law, determines the drying rate. 6,8,9 To better understand the drying process in a spouted bed, various experimental measurements using an optical fiber probe, 10 the inlet/outlet air moisture/temperature, 11 or a soft sensor 12 have been performed. Meanwhile, mathematical models have been proposed.…”

Section: Introductionmentioning

confidence: 99%

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Novel CFD-DEM Model for Spouted Bed Drying Incorporating Intraparticle Heat and Mass Diffusion

Che

Wang

et al. 2023

Ind. Eng. Chem. Res.

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In the final phase of particle drying in a spouted bed, the drying rate is governed by intraparticle heat and mass diffusion. Coupled computational fluid dynamics and the discrete element method (CFD-DEM) have proven to be suitable tools for modeling gas–solid in a spouted bed. However, existing CFD-DEM models are primarily employed to calculate the interphase heat and mass transfer rates based on an assumption of uniform intraparticle temperature and moisture distributions. Alternatively, some models take into account only the evaporation on the surface of the particles. As a result, these models may not reasonably represent the final phase of particle drying. This study introduces a novel CFD-DEM model for spouted bed drying that incorporates intraparticle heat and mass diffusion. The model combines the CFD-DEM governing equations with two one-dimensional intraparticle heat and mass diffusion equations. Benchmark cases using a spouted bed are presented to demonstrate the feasibility of the proposed model. The results indicate that the CFD-DEM model effectively reproduces the rational heat and mass transfer laws of the spouted bed particle drying process characterized by an overall decline in transfer rates. Furthermore, the model provides valuable insights into the temperature and moisture distributions within the particles. The proposed model exhibits great potential for extension to real-world industrial applications, encompassing complex heat and mass diffusion phenomena as well as coupling characteristics.

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