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A mathematical model for predicting the drying rate of cocoa bean (Theobroma cacao L.) in a hot air dryer using dimensional analysis CIGR Journal
Nwakuba, Nnaemeka Reginald.
Development of a mathematical model for predicting the drying rate of a thin layer cocoa bean in a convective hot air dryer using dimensional analysis based on the Buckingham’s π theorem is presented. Results obtained show that drying rate decreases as the moisture level reduces due to increase in the intra-particle resistance to internal moisture migration of the cocoa beans. High coefficients of determination of 94.7%, 94.7% and 99.5% at temperatures of 60, 70 and 80oC respectively between the predicted and experimental values showed that the method is good. The model was validated with data obtained from an existing thin layer convective dryer and there was no significant difference between the experimental drying rate and the predicted values at 5%...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agric. Engineering; Crop Processing engineering cocoa bean; Thin layer drying; Dimensional analysis; Drying rate; Prediction equation..
Ano: 2017 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4107
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Assessment of some physical properties of dried potatoes CIGR Journal
Hafezi, Negar; Sheikhdavoodi, Mohammad Javad; Sajadiye, Seyed Majid.
The effect of drying behaviour on the drying rate and quality characteristics of potato slices in a vacuum-infrared drying system was studied. In this research, the effect of the infrared radiation powers (100, 150, and 200 W) and vacuum levels (20, 80, 140 mmHg and atmosphere pressure) at different slice thickness (1, 2 and 3 mm) on drying rate and shrinkage percentage and rehydration capacity were investigated.  It was concluded that infrared radiation power amount has a significant effect on processing time and drying rate. With increasing radiation power, drying time is reduced and consequently drying rate is increased. The drying rate curve of potato slices at initial drying time is in the ascending phase because of surface moisture evaporation and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Potato; Drying rate; Vacuum; Infrared radiation; Shrinkage; Rehydration.
Ano: 2016 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3583
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Drying and storage of Eugenia involucrata DC. seeds Scientia Agricola
Maluf,Angela Maria; Bilia,Denise Augusta Camargo; Barbedo,Claudio José.
The physiological quality of seeds of native species is important to produce healthy saplings and therefore guarantee the success of programs to recover disturbed vegetation. This reinforces the necessity for investigating the physiological quality of those seeds. To evaluate the effects of different drying rates on the germination, moisture content and storability of Eugenia involucrata diaspores, mature fruits collected at Mogi Guaçu, SP, Brazil had their epi- and mesocarps removed by washing and were dried at 30, 40 or 50ºC until their water content was reduced from 57% (fresh diaspores) to 13% (final drying), totaling six drying levels. In a second experiment, diaspores had their moisture content reduced from 57% to 49%, at 30ºC, totaling six drying...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Germination; Drying rate; Recalcitrant seed.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300009
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Drying behaviour and engineering properties of Lima beans CIGR Journal
MOHITE, ASHISH M; Sharma, Neha.
In this present research communication, selected engineering properties of lima beans and drying behaviour of beans using different dryers were studied. The results for geometric mean diameter and sphericity were found as 8.82 and 0.66. Bulk, tap and true densities were found as 568.1 kg/m3,625.8 kg/m3 and 769 kg/m 3 respectively. Arithmetic mean diameter, equivalent mean diameter and square mean diameter values were found to be 4.84 mm, 24.89 mm and 8.08 mm. Values for static coefficient of friction was highest on plywood surface followed by mild sheet and stainless steel. Ash content, crude fat and fiber content was found as 3.85%, 20.11% and 4.23 for lima beans. The drying behaviour of beans at three temperatures 40 oC,60 oC and 80oC at constant air...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Seeds; Drying rate; Density.
Ano: 2018 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4838
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Increasing the rate of drying reduces metabolic imbalance, lipid peroxidation and critical water content in radicles of garden pea (Pisum sativum L.) Biol. Res.
Ntuli,Tobias M; Pammenter,Norman W; Berjak,Patricia.
Orthodox seeds become desiccation-sensitive as they undergo germination. As a result, germinating seeds serve as a model to study desiccation sensitivity in plant tissues. The effects of the rate of drying on the viability, respiratory metabolism and free radical processes were thus studied during dehydration and wet storage of radicles of Pisum sativum. For both drying regimes desiccation could be described by exponential and inverse modified functions. Viability, as assessed by germination capacity and tetrazolium staining, remained at 100% during rapid (< 24 h) desiccation. However, it declined sharply at c. 0.26 g g¹ dm following slow (c. 5 days) drying. Increasing the rate of dehydration thus lowered the critical water content for survival. Rapid...
Tipo: Journal article Palavras-chave: Antioxidant; Desiccation; Drying rate; Free radical processes; Lipid peroxidation; Metabolism; Respiration; Pisum sativum; Seed storage.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000200002
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INFLUENCE OF DIFFERENT TEMPERATURES AND AIRFLOWS ON DRYING OF NATURAL AND PULPED COFFEE REA
Alves,Guilherme E.; Borém,Flávio M.; Andrade,Ednilton T.; Isquierdo,Éder P.; Siqueira,Valdiney C.; Dias,Camila de A..
ABSTRACT This study aimed to evaluate drying kinetics for natural and pulped coffee, using different temperatures and drying airflows. For the conduction of the experiment, coffee fruits (Coffea arabica L. cv. Topázio) were harvested manually, selecting only ripe fruits and subsequent to the hydraulic separation. For drying the coffee, use a mechanical dryer with two temperatures (40 and 45°C) and four drying air streams (24; 60; 96 and 132 m3.min-1.m-2). Twelve models for employees to describe the drying kinetics of coffees. Among the models used to describe the drying process of natural coffee and pulped coffee, according to the results of the coefficient of determination, relative mean error, standard deviation of estimates and distribution of waste...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coffea arabica L.; Mathematical modeling; Drying rate.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000200192
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Investigating of drying kinetics and mathematical modeling of turnip CIGR Journal
Gharehbeglou, Pouria; Askari, Bijan; Homayouni Rad, Aziz; Hoseini, Seyed Sajjad; Tavakoili Pour, Hamid; Elhami Rad, Amir Hosein.
The drying process of turnip and drying rate curves were investigated at different temperatures (55, 70 and 85°C) with air flow rate of 1.5 m/s.  Also effective diffusion coefficient and activation energy were calculated by using Arrhenius equation and Fick’s second law for infinite slab.  The effective diffusivity varied between 5.471×10-10 and 8.966×10-10 in the range of (55°C to 85°C).  The value of activation energy was found to be 16.013 kJ/mol.  The mathematical models (Newton, Page, Modified Page, Henderson and Pabis, Logarithmic, Two term, Two term exponential, Wang and Singh, Simplified Fick’s diffusion, Modified Page –II, Verma, Midilli–Kucuk, Hii, Law and Cloke, Approximation of diffusion, Modified Henderson and Pabis) were fitted to the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Turnip; Hot air convective drying; Modeling; Drying rate; Effective diffusivity; Activation energy.
Ano: 2014 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2864
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Using a Double-pass solar drier for drying of bamboo shoots JARTS
Banout, Jan; Ehl, Petr.
Three different drying methods, a forced convection double-pass solar drier (DPSD), typical cabinet type natural convection solar drier (CD) and traditional open-sun drying (OSD) were used for draying of bamboo shoots in central Vietnam. During drying the operational parameters such as drying temperature, relative humidity, air velocity, insolation and water evaporation have been recorded hourly. The mean drying temperatures and relative humidity in the drying chamber were 55.2°C, 23.7%; 47.5°C, 37,6%; 36.2°C, 47.8% in DPSD, CD and OSD, respectively. The mean global radiation during all experimental runs was 670 Wm−2. The result also shows that fastest drying process was occurred in DPSD where the falling-rate period was achieved after 7 hours, in change...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Food Science; Agricultultural economics solar drying; Drying efficiency; Drying rate; Bamboo shoots; Central Vietnam.
Ano: 2011 URL: http://www.jarts.info/index.php/jarts/article/view/2011072538416
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