Leaves drying kinetics of the species Zanthoxylum sprucei (Rutaceae) and Melampodium divaricatum (Asteraceae)

The study of the drying of the plants is important for the extraction methods of the active principles, since it provides benefits both for the efficiency and for the stability. The objective of this research is to study the drying kinetics of the leaves of Zanthoxylum sprucei (Rutaceae) and Melampodium divaricatum (Asteraceae) species from the Manabí province. Eight empirical models derived from Fick's law with adjustment and the STATISTICA software as modeler was used. The model was made by applying the ORIGIN Pro fit curve. The kinetic results were obtained experimentally in a laboratory scale tunnel dryer with a temperature of 40°C, at 1 atm of pressure and a speed air of 8.47 m.s-1. To determine the model that best fits the experimental data, it relies on the correlation coefficient (R2), mean square error (ERMS) and chi-square (X2). The mathematical model that best describes the drying process is the logarithmic for Zanthoxylum sprucei and the Wang and Singh model for Melampodium divaricatum.

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Numerical Modelling of Drying Kinetics of Banana Flowers using Natural and Forced Convection Dryers

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.j1057.0881019 ◽

2019 ◽

Vol 8 (10) ◽

pp. 4193-4197

Keyword(s):

Developing Countries ◽

Comparative Analysis ◽

Forced Convection ◽

Drying Kinetics ◽

Mean Square ◽

Chi Square ◽

Evacuated Tube Collector ◽

High Level ◽

Evacuated Tube ◽

Kinetics Of

In the modern scenario insufficient of nutrition food is a major problem for the fast increasing population in many developing countries. Banana flowers contain high level of dietary fibre. The comparative analysis of drying kinetics of banana flowers using natural and forced convection solar dryers is the aim of this present study. Drying of banana flowers in forced convection solar dryer aided with evacuated tube collector (ETC) decreases the moisture content from 97.2 (wb%) to 8.4 (wb%) in 11 hours. This is compared with solar cabinet dryer and natural sun drying which takes 15 hours and 19 hours respectively. Ten developed mathematical models are used to evaluate the suitability of fit which identifies the drying kinetics of banana flowers for both solar dryers using IBM SPSS 23 package. The result exhibits that, Midilli et al model has the high value of correlation coefficient (R2 ) and least value of reduced chi – square and root mean square error (RMSE) for the designed dryers showing the suitability of fit for drying of banana flowers. Also it is observed that, the quality and appearance of the solar dried banana flowers using ETC is more acceptable than the natural and cabinet dried Banana flowers

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Drying Kinetics of Continuous and Intermittent Heat Pump Drying of Green Soybean Seeds

International Journal of Food Engineering ◽

10.1515/ijfe-2017-0182 ◽

2017 ◽

Vol 13 (11) ◽

Cited By ~ 5

Author(s):

Haibo Zhao ◽

Zhao Yang ◽

Zhichao Tao

Keyword(s):

Experimental Data ◽

Heat Pump ◽

Drying Kinetics ◽

Percentage Error ◽

Drying Rate ◽

Soybean Seeds ◽

Mean Square ◽

Chi Square ◽

Heat Pump Drying ◽

Kinetics Of

AbstractThis paper is concerned with drying kinetics and models of heat pump drying (HPD) of green soybean. Experiments were done for continuous and intermittent drying with intermittency of 1, 3 and 6. Drying rate decreases sharply in continuous HPD process, while circuitously in intermittent HPD process. Peak drying rate values appear in every drying period of intermittent drying and differ a lot because of different intermittent ratios. In addition, various mathematical models were investigated to describe the HPD kinetics of green soybean seeds. Fitting suitability of the experimental data by models was specified as comparing the coefficient of correlation (R2), mean absolute percentage error (EMD%), Chi-squareΧ2and root mean square error (ERMS). The page model and 23rd model were found to be the most suitable models in describing the continuous and intermittent drying of green soybeans, respectively.

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Empirical models in the description of prickly pear shoot (Nopal) drying kinetics

Revista Brasileira de Engenharia Agrícola e Ambiental ◽

10.1590/1807-1929/agriambi.v21n11p798-802 ◽

2017 ◽

Vol 21 (11) ◽

pp. 798-802

Author(s):

Emmanuel M. Pereira ◽

Wilton P. da Silva ◽

Josivanda P. Gomes ◽

Cleide M. D. P. da S. e Silva ◽

Anderson dos S. Formiga ◽

...

Keyword(s):

Empirical Models ◽

Drying Kinetics ◽

Prickly Pear ◽

Minimally Processed ◽

Chi Square ◽

Different Temperatures ◽

Fresh Cut ◽

Kinetics Of ◽

Best Fit ◽

Graphic Pattern

ABSTRACT The objective of this study was to describe the technological process involved in the drying kinetics of fresh-cut prickly pear shoots through numerical and analytical solutions. Shoots of two different prickly pear species were used, ‘Gigante’ and ‘Miúda’. Drying was performed at different temperatures (50, 60, 70 and 80 °C) and weighing procedures were made continuously. The experimental data were expressed as moisture ratio. The Page model showed the best fit to the drying kinetics of minimally processed ‘Gigante’ and ‘Miúda’ prickly pear shoots, with the best coefficients of determination and Chi-square. Peleg and Wang & Singh models can not be used to simulate the drying of ‘Gigante’ and ‘Miúda’ prickly pear shoots within the evaluated range of temperatures, showing an incoherent graphic pattern.

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Mathematical Modeling of Thin-Layer Solar Drying for Yarrow, Coriander and Hollyhock

International Journal of Food Engineering ◽

10.1515/ijfe-2015-0134 ◽

2015 ◽

Vol 11 (5) ◽

pp. 691-700 ◽

Cited By ~ 1

Author(s):

Yasaman Amanlou ◽

Teymour Tavakoli Hashjin ◽

Barat Ghobadian ◽

Gholamhassan Najafi

Keyword(s):

Theoretical Models ◽

Drying Kinetics ◽

Medicinal Products ◽

Drying Process ◽

Chi Square ◽

Air Temperatures ◽

C 50 ◽

Drying Conditions ◽

Kinetics Of ◽

Best Fit

Abstract The objective of this study is to investigate the drying kinetics of Yarrow, Coriander and Hollyhock flowers. These three medicinal products were dried using a solar hybrid photovoltaic-thermal dryer. The drying process was examined at the air temperatures of 40°C, 50°C and 60°C and air velocities of 0.5, 1 and 1.5 m/s. The experimental drying data were fitted to different theoretical models to predict the drying kinetics. Nonlinear regression analysis was performed to relate the parameters of the model with the drying conditions. The performance of these models was evaluated by comparing the correlation coefficient ($${R^2}$$), root mean square error (RMSE) and the chi-square ($${\chi ^2}$$) between the observed and the predicted moisture ratios. Among all the models, the exponential two-term was found to have the best fit in this study. Also the influence of plant type, air temperature and velocity was investigated.

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Investigation of ultrasound-assisted convective drying process on quality characteristics and drying kinetics of zucchini slices

Heat and Mass Transfer ◽

10.1007/s00231-019-02573-6 ◽

2019 ◽

Vol 55 (8) ◽

pp. 2153-2163 ◽

Cited By ~ 3

Author(s):

Niloufar Bagheri ◽

Somayeh Taghian Dinani

Keyword(s):

Quality Characteristics ◽

Drying Kinetics ◽

Convective Drying ◽

Drying Process ◽

Ultrasound Assisted ◽

Kinetics Of

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Experimental Evaluation and Kinetic Analysis of Direct-Contact Ultrasonic Fabric Drying Process

Journal of Thermal Science and Engineering Applications ◽

10.1115/1.4047566 ◽

2020 ◽

Vol 13 (2) ◽

Author(s):

Chang Peng ◽

Saeed Moghaddam

Keyword(s):

Direct Contact ◽

Ultrasonic Transducer ◽

Gaussian Model ◽

Weibull Model ◽

Drying Kinetics ◽

Energy Prices ◽

Drying Process ◽

Liquid Form ◽

Drying Time ◽

Kinetics Of

Abstract Over the past two decades, due to the rising energy prices and growing awareness about climate change, significant efforts have been devoted to reducing the energy consumption of various home appliances. However, the energy efficiency of clothes dryers has little improvement. Recent innovations in the direct-contact ultrasonic fabric drying technique offer new opportunities for energy saving. In this technique, high-frequency mechanical vibrations generated by the ultrasonic transducer are utilized to atomize water from a fabric in the liquid form, which demonstrates great potential for reducing energy use and drying time of the fabric drying process. Here, for the first time, fabric drying kinetics under different direct-contact ultrasonic drying conditions were investigated experimentally and analytically. The drying processes of four kinds of fabrics were experimentally tested under different ultrasonic transducer vibration frequency (115, 135, and 155 kHz) and input power (1.2, 2.5, and 4.4 W) conditions. According to the experimental data, five different kinds of models were applied to quantify the drying kinetics of fabrics during direct-contact ultrasonic drying. The models not only incorporated the transducer parameters but also the parameters related to the nature of fabric. Our evaluation results of model prediction performance demonstrated that the two empirical models, i.e., the Weibull model and the Gaussian model, were superior to the three semi-theoretical models for anticipating the drying kinetics of fabrics under direct-contact ultrasonic drying. Furthermore, the Weibull model is more suitable for practical energy-efficient direct-contact ultrasonic fabric drying applications compared with the Gaussian model.

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Experimental investigation of thin layer drying kinetics of ghost chilli pepper (Capsicum Chinense Jacq.) dried in a forced convection solar tunnel dryer

Renewable Energy ◽

10.1016/j.renene.2016.12.091 ◽

2017 ◽

Vol 105 ◽

pp. 583-589 ◽

Cited By ~ 48

Author(s):

D.K. Rabha ◽

P. Muthukumar ◽

C. Somayaji

Keyword(s):

Experimental Investigation ◽

Thin Layer ◽

Forced Convection ◽

Drying Kinetics ◽

Capsicum Chinense ◽

Chilli Pepper ◽

Tunnel Dryer ◽

Thin Layer Drying ◽

Kinetics Of

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Drying kinetics of Chinese garlic (Allium tuberosum) and its effect on color

Ciência e Natura ◽

10.5902/2179460x43424 ◽

2020 ◽

Vol 42 ◽

pp. e8

Author(s):

Paula De Almeida Rios ◽

Ednilton Tavares De Andrade ◽

Kátia Soares Moreira ◽

Filipe Da Silva De Oliveira ◽

Bárbara Lemes Outeiro Araújo

Keyword(s):

Experimental Data ◽

Mathematical Model ◽

Air Temperature ◽

Linear Regression Analysis ◽

Drying Kinetics ◽

Allium Tuberosum ◽

Thin Slices ◽

The Mathematical Model ◽

Quasi Newton ◽

Kinetics Of

Dehydrated garlic is an important component both for culinary and medicinal purposes. However, there is a scarcity of studies that characterizes its drying kinetics. Thus, the objective of this work was to study the drying kinetics of Chinese garlic (Allium tuberosum), as well as to analyze the color effect resulting from each treatment. The garlic bulbs were cut into thin slices with a width of 2 and 3 mm, subjected to the drying air temperature of 35, 45, 55 and 70 °C in a mechanical dryer of a fixed layer with forced convection. Was performed a non-linear regression analysis by the Quasi-Newton method, for adjustment to 11 mathematical models to the experimental data of drying. The Midilli equation was the mathematical model that best characterized all the drying temperatures, for the experimental data. The diffusion coefficient presented values between 1.46 x 10-11 and 7.32 x 10-11 m2.s-1. The increase of the drying air temperature caused the dimming of the samples with a reduction of the L* coordinate and reduction of the yellow of the samples according to the coordinate results h*. The temperature of 70 °C was detrimental to the maintenance of the Chinese garlic coloration.

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