Mathematical Modeling and Simulation of Drying of a Single Wet Particle in a Coaxial Impinging Stream Dryer

Rahimi, Amir; Niksiar, Arezou

doi:10.1080/00986440903287882

Cited by 6 publications

(2 citation statements)

References 13 publications

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“…Regarding the drying process of the particulate materials in a perfect mixed vessel, the governing equations are similar to the equation presented in the preceding section. For a plug flow reactor, the variation equations of solid moisture, solid velocity, and solid temperature and the variation equations of gas humidity and gas temperature along the vessel length are developed as follows, respectively: [15,16] …”

Section: Governing Equationsmentioning

confidence: 99%

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Application of Markov Chain Analysis and Tanks-in-Series Model in Mathematical Modeling of Impinging Stream Dryers

Rahimi

Niksiar

2009

Drying Technology

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In spite of the fact that the principles of impinging stream reactors have been developed for more than half a century, the performance analysis of such devices, from a viewpoint of the mathematical modeling, has not been investigated extensively. In this study two models are proposed to describe the drying performance of particulate materials in two-impinging stream dryers. The models are developed based on the Markov chain analysis and the tanks-inseries model. The required parameters for each model are determined by using RTD data obtained in a two-impinging stream dryer and the governing equations are solved numerically. Comparison of the results of the models with available experimental data shows that the stirred tanks-in-series model successfully explains the drying behavior in impinging stream dryers. Nevertheless, the results of the model that is developed based on the Markov chain analysis are not in exact agreement with corresponding experimental data because of the extremely short residence time of the particles inside the dryer. Also, the effects of some operating parameters on the performance of such dryers are investigated. The results indicate that the drying efficiency of the dryer increases when solid-to-gas flow rate ratio, initial moisture content, and diameter of the particles decrease and when the temperature of the carrier gas increases.

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Section: Governing Equationsmentioning

confidence: 99%

“…The following correlation is presented for determining D CD [15] : D CD ¼ 0:32 Â 10 À2 expð4:35 Â 10 À12 T p Þ Â exp 17:1 exp½À1:8 Â 10 À4 ðT p À 77:…”

Section: Diffusion Coefficientsmentioning

confidence: 99%