Heat and Mass Transfer in Thermal Drying of Wool: A Theoretical Approach

Haghi, A. K.; Angiz, F. Zerafat

doi:10.1142/9789812771957_0065

Cited by 8 publications

(4 citation statements)

References 2 publications

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“…Table 2 summarizes the findings of the best three thin layer drying models with their statistical outcomes. Two term (Henderson, 1974), rational (Haghi and Angiz, 2007) and sigmoid (Antal et al, 2011) models were qualified satisfactorily for the experimental drying data among the others listed in Table 1. These mathematical expressions had high R 2 and low χ 2 and RMSE values ranging between 0.91160 to 099880, 0.00001 to 0.00949 and 0.00185 to 0.08104, respectively.…”

Section: Dryingmentioning

confidence: 90%

Influence of Different Pretreatments on Hot air and Microwave-Hot Air Combined Drying of White Sweet Cherry

Şimşek

Süfer

2021

Turkish JAF Sci.Tech.

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Microwave (MW)-hot air (HA) combined drying was applied to white sweet cherries besides solely HA drying at 50, 60 and 70°C in the presence of citric acid, sucrose and freezing pretreatment in this study. Single power level of MW (90 W) was chosen, and drying behavior of all samples was modelled by using eleven thin layer equations. Two-term, rational and sigmoid models were the most suitable models for describing drying phenomena. Effective moisture diffusivities (Deff) ranged from 1.724×10-10 to 5.173×10-10 m2/s in HA drying and from 4.260×10-10 to 1.805×10-9 m2/s in MW-HA drying. Activation energies (Ea) were between 2.785 and 30.541 kJ/mol and 6.929 and 42.101 kJ/mol for HA and MW-HA drying techniques, respectively. Total color change (ΔE) levels of the outer surface of dried cherries were generally higher than the ones of inner surface. Freezing pretreatment had a comparably lower enhancing effect on the total phenolic content (TPC) of HA dried white sweet cherries compared to fresh sample. The TPC of freezing pretreated and HA dried at 50°C and HA dried at 70°C control samples were 1.481 ± 0.398 mg gallic acid equivalent (GAE)/g dry matter (DM) and 6.181 ± 0.012 mg GAE/g DM as the minimum and maximum, respectively. These values were determined as 4.183 ± 1.728 and 8.240 ± 0.502 mg GAE/g DM that were belonged to MW-HA dried at 50°C control and freezing pretreated MW-HA dried at 70°C samples in combined procedure, respectively.

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Section: Dryingmentioning

confidence: 90%

Influence of Different Pretreatments on Hot air and Microwave-Hot Air Combined Drying of White Sweet Cherry

Şimşek

Süfer

2021

Turkish JAF Sci.Tech.

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“…In this case, the drying process model in rotary dryer with uniform particle size D p was combined with the particle size distribution model. The drying process model with uniform particle size was obtained by solving analitycally Equation (6) with boundary conditions (8) and 9as follows, The integration in Equation (23) was carried out numerically using Simpson rule, where the higher limit of integration was replaced with D p,max obtained from Equation (27).…”

Section: Resultsmentioning

confidence: 99%

“…The predicted result of ( ) Differential Equation (6) with boundary conditions (8) and (9) was solved analytically to obtain moisture content of solid particle as a function of axial position in the rotary dryer and particle diameter, ( )…”

Section: Methodsmentioning

confidence: 99%

“…The drying process is influenced both by external conditions, such as temperature, velocity, humidity of drying air and particle size distribution and by internal drying mechanism inside the solid which depends on the solid particle characteristic including pore structure, hygroscopic characteristic, shape and size of the particles. A number of theories (models) that describe the process of drying of solid particles has been developed by previous researchers such as Akpinar and Dincer [1], Haghi and Angiz [8], Haghi [9,10]. These researchers estimate theoretically the rate of drying with the diffusion model.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Particle Size Distribution on Ammonium Sulphate Dried in a Rotary Dryer

Susianto¹,

Altway²,

Kuswandi³

et al. 2010

JTS

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   The aim of this work is to study theoretically, by mathematical model development, the effect of particle size distribution on the performance of rotary dryer to dry ammonium sulphate fertilizer assuming plug flow with axial dispersion pattern (PFDA model) for solid particle flow. The mathematical model development was carried out by combining the drying processes model with particle size distribution model. Particle size distribution models used are Rosin-Rommler model and Gamma distribution model. For simplicity, the model of drying processes of solid particles in the rotary dryer was developed by assuming of uniform air conditions (temperature and humidity) along the rotary dryer as in the entry conditions. The resulting differential equations were solved analytically under Matlab 6.1 facility.Since this model, solid hold up, and axial dispersion number were obtained from empirical correlations in the literatures. The drying rate of ammonium sulphate fertilizer in rotary dryer was estimated using isothermal diffusion model with effective diffusivity of moisture in the particle obtained from previous study [2]. Using Gamma function distribution, this research showed that for the value of the coefficient of variance (CV) less than 0.5, particle size distribution does not have significant effect on dryer performance. For the value of CV greater than 0.5, the dryer performance increase (or outlet solid moisture content decrease) with increasing the value of CV. The application of Rosin-Rammler model gives lower prediction of outlet solid moisture content compared to the application of Gamma function model.

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Microwave drying of TURKISH red meat (watermelon) radish (RAPHANUS SATIVUS l.): effect of osmotic dehydration, pre-treatment and slice thickness

Çınkır

Süfer

2020

Heat Mass Transfer

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Heat and Mass Transfer in Thermal Drying of Wool: A Theoretical Approach

Cited by 8 publications

References 2 publications

Influence of Different Pretreatments on Hot air and Microwave-Hot Air Combined Drying of White Sweet Cherry

Influence of Different Pretreatments on Hot air and Microwave-Hot Air Combined Drying of White Sweet Cherry

Effect of Particle Size Distribution on Ammonium Sulphate Dried in a Rotary Dryer

Microwave drying of TURKISH red meat (watermelon) radish (RAPHANUS SATIVUS l.): effect of osmotic dehydration, pre-treatment and slice thickness

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