Mathematical modelling of the heat and moisture diffusion in a dairy powder particle with crystallisation phase change within the particle matrix

Yazdanpanah, Nima; Langrish, T.A.G.

doi:10.1016/j.ijheatmasstransfer.2013.02.033

Cited by 2 publications

(2 citation statements)

References 58 publications

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“…The transport of small molecules in polymeric materials has far reaching implications for such diverse problems as packaging, 1 food processing 2,3 and drug delivery. 4 Such movement can be quantified using diffusion equations and material-dependent diffusion coefficients.…”

Section: Introductionmentioning

confidence: 99%

Kinks in experimental diffusion profiles of a dissolving semi-crystalline polymer explained by a concentration-dependent diffusion coefficient

Hermes

Sitta

Schillinger

et al. 2015

Phys. Chem. Chem. Phys.

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The dissolution of polyethylene oxide (PEO) tablets in water has been followed in situ by neutron radiography. When in contact with water, the crystalline phase of semi-crystalline PEO melts once a certain water content is attained. Polymer concentration profiles obtained from the neutron transmission images exhibited a pronounced kink which corresponds to a sharp front in the images and which is related to the melting transition. Sharp diffusion fronts and phase transitions are often linked to non-Fickian behaviour. However, by considering the time evolution of the complete concentration profiles in detail it is shown that the dissolution process can be explained using Fickian diffusion equations with a concentration-dependent diffusion coefficient.

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Section: Introductionmentioning

confidence: 99%

Kinks in experimental diffusion profiles of a dissolving semi-crystalline polymer explained by a concentration-dependent diffusion coefficient

Hermes

Sitta

Schillinger

et al. 2015

Phys. Chem. Chem. Phys.

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show abstract

“…The effects of drying conditions, including the device structure, flow pattern, temperature, and different drying systems, have been investigated systematically . In addition, several mass transfer models for dehydration have been developed to demonstrate the transport mechanisms, resistances, and the diffusion process . For polymer drying process, the dehydration mechanism and the influences of operation conditions also have been reported in a few literatures without the consideration of reactions.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the Dehydration Process Coupled with Solid‐State Polymerization in Nylon 6 Drying Column

Sun

Qin

et al. 2015

Macro Reaction Engineering

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Drying of wet Nylon 6 chips is a significant process for dehydration after granulation. During the process, the flow pattern of gas-solid phases is countercurrent flow, while the mass transfer and solid-state polymerization (SSP) are deeply coupled with each other. In this paper, the mass transfer behavior for dehydration at drying conditions has been investigated by single pellet experiments using Thermogravimetric Analyzer (TGA). A diffusion model for dehydration has been developed and the diffusion coefficient has been estimated by TGA test data. Besides, the SSP reaction characteristic has been independently studied in a polymerization tube at different temperatures. The reaction kinetics parameters, including the rate constants and equilibrium constants for both forward and reverse reactions, have been obtained by fitting the experimental data. Based on that, an integrated model combining the mass/heat transfer and polymerization reaction has been presented for the industrial continuous Nylon 6 drying process. The influences of drying conditions including the initial number average degree of polymerization, inlet nitrogen temperature, and flow rate, on distribution profiles of temperatures, water contents, and degree of polymerization of chips along the column height have been simulated. The integrated model can be used to predict the industrial drying process.

show abstract

Mathematical modelling of the heat and moisture diffusion in a dairy powder particle with crystallisation phase change within the particle matrix

Cited by 2 publications

References 58 publications

Kinks in experimental diffusion profiles of a dissolving semi-crystalline polymer explained by a concentration-dependent diffusion coefficient

Kinks in experimental diffusion profiles of a dissolving semi-crystalline polymer explained by a concentration-dependent diffusion coefficient

Modeling of the Dehydration Process Coupled with Solid‐State Polymerization in Nylon 6 Drying Column

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