The drying kinetics of bird’s chillies in a fluidized bed dryer

Tasirin, Siti Masrinda; Kamarudin, Siti Kartom; Jaafar, K; Lee, K. F.

doi:10.1016/j.jfoodeng.2006.02.032

Cited by 38 publications

(18 citation statements)

References 8 publications

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“…Table 10 shows the time taken by fresh bird's eye chilli to reach 16% (dry base) (Tasirin et al, 2007). From the data in Table 10, it is concluded that drying at high temperature and air velocity with a thin layer height results in shorter drying time in achieving the required moisture content.…”

Section: Selection Of Optimum Experiments Parameters Using Ofat Methodsmentioning

confidence: 99%

“…However, less work has been done on the optimization of the design experiments for drying kinetics parameters. Even the few existing optimization work done using the OFAT full factorial method needs a large number of experimental work, longer period of time and is expensive (Tasirin, Kamarudin, Jaafar, & Lee, 2007). Due to that, this study attempts to predict the optimized drying parameters of bird's eye chilli in fluidized bed dryer using the Taguchi Method.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of drying parameters of bird’s eye chilli in a fluidized bed dryer

Tasirin

Kamarudin

Ghani

et al. 2007

Journal of Food Engineering

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Section: Selection Of Optimum Experiments Parameters Using Ofat Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of drying parameters of bird’s eye chilli in a fluidized bed dryer

Tasirin

Kamarudin

Ghani

et al. 2007

Journal of Food Engineering

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“…Shafri and Ezzat (2009) studied on quantitative performance of spectral indices in large scale plant health analysis. Accordingly, procurement of machineries and drying apparatus are burdens to some operators (Tasirin et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Apart from this, heat transfer rate between the fluidized layer and immersed object is high. Therefore, only a small area is needed for heat transfer (Tasirin et al, 2006). And technological innovation was adapted to protect crop might bring about significant benefits to farmers (Luce et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Drying Characteristics of Chili Using Continuous Fluidized-Bed Dryer

Dimitrios¹

2010

American Journal of Applied Sciences

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Problem statement:The objective of this study was to obtain the dying characteristics of the Jinda chili, a commonly grown variety in the Northeatern of Thailand, using the continuous fluidizedbed dryer in reducing moisture content of dried chili up to 13% wet basis as comparable to the dried chili in the market and to investigate the effect of drying temperature and drying air velocity. Approach: Drying characteristics was to study under varying conditions of drying temperature (50, 60, 70, 80, 90 and 100°C) and drying air velocity (4, 5 and 6 m sec −1 ). Results: The drying time decreased within the increasing of drying temperature and drying air velocity. Drying air velocity affected the drift and continuously moves of chili particle outward from dryer chamber under continuous fluidized-bed technique. The decreasing of moisture content effected with increasing of a compound capsaicin of dried chili compare to fresh chili. The diffusion coefficient of moisture content increased with increasing all drying temperature and drying air velocity. Conclusion: Drying temperature was the significant factor of the chili moisture content reduction. Drying air velocity affected the move of chili outward from chamber under the continuous fluidized bed drying process.

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“…Fluidized bed dryers have successfully been used for drying of products such as coal [1], maize [2], paddy [3], coconut [4], biosynthesis products [5], chillies [6,7], nylon [8], baker's yeast [9], black tea [10] and bleaching agents (sodium perborate) [11]. Industrial drying operations require a high rate of heat and mass transfer and a high rate of solid transport to or from the dryer.…”

Section: Introductionmentioning

confidence: 99%

Fluidized Bed Dryers — Recent Advances

Daud¹

2008

adv powder technol

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Although industrial fluidized bed dryers have been used successfully for the drying of wet solid particles for many years, the development of industrial fluidized bed dryers for any particular application is fraught with difficulties such as scaling-up, poor fluidization and non-uniform product quality. Scaling-up is the major problem and there are very few good, reliable theoretical models that can replace the expensive laboratory work and pilot-plant trials. This problem is mainly due to the different behavior of bubbles and mixing regimes in fluidized bed dryers of different size. Simple transformation of laboratory batch drying data to continuous back-mixed dryers using the residence time distribution of the solids is insufficient to account for the complex flow and heat and mass transfer phenomena occurring in the bed. Although time scaling using temperature driving forces and solids mass flux for the same change in moisture content in the batch and continuous dryers has been successful in predicting moisture content profiles in the continuous dryer at the constant rate period, it does not take into account solid mixing. Two-phase Davidson-Harrison models have been used in modeling of the continuous back-mixed dryer with various degrees of success. On the other hand, the three-phase Kunii-Levenspiel model is seldom used in modeling fluidized bed dryers because it is too complex to handle. A combination of multi-phase models and residence time distribution could improve predicting power for back-mixed dryers because this combination takes into account both the bubbles and solid mixing phenomena. Incremental models were widely used to model continuous plug flow fluidized bed dryers, but the cross-flow of drying medium has not been sufficiently modeled except by the author. In some incremental models, axial dispersion is modeled using the Peclet number, Pe. A combination of an incremental model with an axial dispersion and cross-flow model of drying medium would improve predicting power. Poor fluidization of Geldart group C particles could be improved by the assistance of external means such as vibration, agitation, rotation and centrifugation. Both vibrated and agitated fluidized bed dryers have been successfully used in industry, but rotating or centrifugal fluidized bed dryers are still not available for industrial use. Nomenclature A bed area (m 2 ) E(t) RTD curve (-) ε bed porosity (-) F dry basis solid flow rate (kg/h) f falling rate drying factor ( • C) G dry basis gas flow rate (kg/h) h bed height (m) L total length of dryer (m) m B mass of bed (kg) N V local solids dying rate (kg/h/m 2 ) NTU number of transfer units (-) Nu nusselt number (-) Pe Peclet number (-)Pr Prandtl number (-) Re p particle Reynolds number (-) T G local gas temperature ( • C) T GI initial gas temperature ( • C) T i inlet gas tenmperature ( • C) T o exhaust gas temperature ( • C) T S local solids temperature ( • C) T wb wet bulb temperature ( • C) t time (s) τ residence time (s) X dry basis solids moisture content (kg/kg) X i inle...

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The drying kinetics of bird’s chillies in a fluidized bed dryer

Cited by 38 publications

References 8 publications

Optimization of drying parameters of bird’s eye chilli in a fluidized bed dryer

Optimization of drying parameters of bird’s eye chilli in a fluidized bed dryer

Drying Characteristics of Chili Using Continuous Fluidized-Bed Dryer

Fluidized Bed Dryers — Recent Advances

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