scholarly journals MATHEMATICAL MODELING OF THE DRYING CURVES OF FOXTAIL MILLET SEEDS IN SPOUTED BED

2015 ◽  
Vol 14 (2) ◽  
pp. 18
Author(s):  
L. D. Do Nascimento ◽  
L. G. Corumbá ◽  
S. C. S. Rocha ◽  
O. P. Taranto ◽  
C. M. L. Costa ◽  
...  
Keyword(s):  
Statistical Tests ◽  
Diffusion Mechanism ◽  
Foxtail Millet ◽  
Drying Kinetics ◽  
Coefficient Of Determination ◽  
Spouted Bed ◽  
Drying Kinetic ◽  
Different Temperatures ◽  
Drying Curves ◽  
Quasi Newton

In order to provide a contribution to future studies of foxtail millet (Setaria italica), the drying kinetics of the seeds was investigated at three different temperatures: 44, 65 and 86°C. The seeds of S. italica with a moisture equal to 30% in dry basis were dried in a conical-cylindrical spouted bed during an interval of 132 min. Some empirical mathematical models were selected to describe the experimental drying kinetics data (Lewis, Henderson and Pabis, Page, Diffusion approach, Midilli and Wang and Singh) and the best models were chosen according to the statistical tests results (coefficient of determination, mean relative percent deviation, mean square root error and residue distribution), using the software Statistica® 7.0 and applying the Quasi-Newton method. Only the decreasing rate period was observed in the drying kinetic curves, indicating that the removal of moisture content was preferably by the diffusion mechanism, which is a characteristic behavior of fibrous products, like the agricultural products. The models of Diffusion Aproach, Page and Midilli were the most suitable to describe the experimental drying curves.

scholarly journals FOAM-MAT DRYING KINETICS OF KEITT MANGO PULP

2017 ◽  
Vol 30 (1) ◽  
pp. 172-180 ◽  
Author(s):  
MARY KARLLA ARAÚJO GUIMARÃES ◽  
◽  
ROSSANA MARIA FEITOSA DE FIGUEIRÊDO ◽  
ALEXANDRE JOSÉ DE MELO QUEIROZ ◽  
Keyword(s):  
Drying Kinetics ◽  
Foam Layer ◽  
Drying Time ◽  
Convection Oven ◽  
Drying Kinetic ◽  
Different Temperatures ◽  
Forced Air ◽  
Drying Curves ◽  
Mango Pulp ◽  
Kinetics Of

ABSTRACT This study aimed to assess the foam-mat drying kinetics of mango pulp (cv. Keitt) adding 1% Emustab® and 1% Super Liga Neutra®, for a whipping time of 20 minutes, dried in a forced -air convection oven at different temperatures (50, 60 and 70oC) and foam layer thicknesses (0.5, 1.0 and 1.5 cm). Drying kinetic data were used to build drying curves and then fit to Page, Henderson, Henderson and Pabis, Logarithmic and two-term Exponential models. Both temperature and foam layer thickness influenced drying time, which reached the shortest value at the highest temperature and smallest thickness. The Page model provided the best fit to the experimental drying curve data.

scholarly journals Effects of Infrared-Assisted Refractance Window™ Drying on the Drying Kinetics, Microstructure, and Color of Physalis Fruit Purée

Foods ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 343
Author(s):  
Luis Puente-Díaz ◽  
Oliver Spolmann ◽  
Diego Nocetti ◽  
Liliana Zura-Bravo ◽  
Roberto Lemus-Mondaca
Keyword(s):  
Statistical Tests ◽  
Coefficient Of Determination ◽  
Drying Process ◽  
Chi Square ◽  
Ir Radiation ◽  
Drying Time ◽  
Drying Curves ◽  
Effective Diffusivities ◽  
Drying Conditions ◽  
Fruit Purée

The objective of this work was to study the influence of the drying temperature, infrared (IR) radiation assistance, and the Mylar™ film thickness during Physalis fruit purée drying by the Refractance Window™ (RW™) method. For this, a RW™ dryer layout with a regulated bath at working temperatures of 60, 75, and 90 °C, Mylar™ thicknesses of 0.19, 0.25, 0.30 mm and IR radiation of 250 W for assisting RW™ drying process was used. Experimental curves data were expressed in moisture ratio (MR) in order to obtain moisture effective diffusivities (non-assisted RW™: Deff = 2.7–10.1 × 10−10 m2/s and IR-assisted RW™: Deff = 4.2–13.4 × 10−10 m2/s) and further drying curves modeling (Page, Henderson–Pabis, Modified Henderson–Pabis, Two-Term, and Midilli–Kucuk models). The Midilli–Kucuk model obtained the best-fit quality on experimental curves regarding statistical tests applied (Coefficient of Determination (R2), Chi-Square (χ2) and Root Mean Square Error (RMSE). Microscopical observations were carried out to study the RW™ drying conditions effect on microstructural changes of Physalis fruit purée. The main findings of this work indicated that the use of IR-assisted RW™ drying effectively accelerates the drying process, which achieved a decrease drying time around 60%. Thus, this combined RW™ process is strongly influenced by the working temperature and IR-power applied, and slightly by Mylar™ thickness.

scholarly journals Drying kinetics of atemoya pulp

2016 ◽  
Vol 20 (7) ◽  
pp. 672-677 ◽  
Author(s):  
Plúvia O. Galdino ◽  
Rossana M. F. de Figueirêdo ◽  
Alexandre J. de M. Queiroz ◽  
Pablícia O. Galdino
Keyword(s):  
Mixing Time ◽  
Theoretical Models ◽  
Coefficient Of Determination ◽  
Drying Method ◽  
Content Ratio ◽  
Different Temperatures ◽  
Forced Air ◽  
Drying Curves ◽  
Kinetics Of ◽  
Best Fit

ABSTRACT This study was conducted in order to obtain drying curves of whole atemoya pulp through the foam-mat drying method. The suspension was prepared with whole atemoya pulp mixed with 2% of Emustab® and 2% of Super Liga Neutra® with mixing time of 20 min, and dried in a forced-air oven at different temperatures (60; 70 and 80 °C) and thicknesses of the foam layer (0.5, 1.0 and 1.5 cm). The drying rate curves were plotted against the water content ratio and the semi-theoretical models of Henderson & Pabis, Page and Midilli were used. All tested models showed coefficient of determination (R2) above 0.993, and the Midilli model showed the best fit for all conditions. Drying curves were affected by temperature and layer thickness.

Drying Kinetics of Malaysian Paddy (Group D Particles) in Spouted Bed Dryer

2006 ◽  
Vol 2 (3) ◽  
Author(s):  
Pin Pin Ng ◽  
Chung Lim Law ◽  
Siti Masrinda Tasirin
Keyword(s):  
Draft Tube ◽  
Air Flow ◽  
Drying Kinetics ◽  
Drying Rate ◽  
Spouted Bed ◽  
Bed Height ◽  
Internal Structures ◽  
Drying Curves ◽  
Group D ◽  
Kinetics Of

Spouted bed is suitable for drying of coarse particles which are Group D of Geldart’s particle classification. Malaysian grown paddy was used as a Group D sample in a lab-scale spouted bed dryer. Drying was carried out in two different internal structures of the dryer, namely with or without the installation of a draft tube, and at several drying temperatures, air flow rates as well as bed heights. Spouted bed drying kinetics of paddy presented in drying curves showed only induction and falling rate periods, without constant drying rate period. The highest drying rate was achieved when paddy was dried without draft tube at low bed height, high drying temperature and air flow rate.

scholarly journals Solar convective drying kinetics and sorption isotherms of Citrus aurantium flowers

2018 ◽  
Author(s):  
Naji Abdenouri ◽  
Hicham El Ferouali ◽  
Ahmed Zoukit ◽  
Said Doubabi
Keyword(s):  
Moisture Content ◽  
Sorption Isotherms ◽  
Isosteric Heat ◽  
Storage Conditions ◽  
Drying Kinetics ◽  
Convective Drying ◽  
Citrus Aurantium ◽  
Peleg Model ◽  
Drying Kinetic ◽  
Drying Curves

Citrus aurantium flowers are high value aromatic and medicinal plants. The storage conditions and quality of dried Citrus aurantium flowers depends on their hygroscopic stability. The equilibrium moisture content was determined at temperatures (from 30 to 60 °C), and the sorption phenomenon is well described by Peleg model. The optimal water activity for the storage of the product was estimated at awop=0.373. Afterwards, the net isosteric heat was evaluated in the range of 88 kJ.mol−1 for small values of the moisture content (Xeq=0.14kg water/kg d.b), and it decreased along with the increase of Xeq. The experimental drying curves showed only a falling rate period. Finally, Midilli-Kucuk model was found to be the more suitable to describe the drying kinetic of Citrus aurantium flowers. Keywords: Drying kinetics; Solar energy; Modeling; Citrus aurantium; Sorption isotherms; Conservation process

scholarly journals Drying kinetics of passion fruit peel for tea products

2020 ◽  
Vol 187 ◽  
pp. 04007
Author(s):  
Chatsuda Sittipa ◽  
Siva Achariyaviriya ◽  
Aree Achariyaviriya ◽  
James C. Moran
Keyword(s):  
Kinetic Model ◽  
Moisture Content ◽  
Initial Moisture Content ◽  
Drying Kinetics ◽  
Passion Fruit ◽  
Coefficient Of Determination ◽  
Fruit Peel ◽  
Chi Square ◽  
Page Model ◽  
Drying Kinetic

An important step in the development of passion fruit tea products is the drying procedure. This procedure uses a lot of energy. The optimization of drying needs knowledge of the drying kinetics. This paper focuses the development of drying kinetics for passion fruit peel. The experiments were conducted utilizing a thin layer dryer with drying air temperatures in the range of 45°C to 65°C The drying air velocity was constant at 1 m/s. The passion fruit peel were dried from their initial moisture content of 559±16% db to a final moisture content of 50±1% db. The models for the kinetic drying proposed by the authors are the Newton model, Page model and the Logarithmic model. The parameters for the drying kinetic models were found by curve fitting the experimental data using non-linear regression. The criteria for evaluating the models were the coefficient of determination (R2), a root mean square error (RMSE) and a reduced chi- square (x2). It was found that the drying kinetic model for passion fruit peel which gave the best fit was the Page model. This drying kinetic model can be applied to find optimum drying conditions.

scholarly journals Modelagem matemática para descrição da cinética de secagem do caldo de cana in natura

2018 ◽  
Vol 1 (40) ◽  
pp. 28
Author(s):  
Edmilson Silva Filho ◽  
Gilcean Silva Alves ◽  
Marco Tulio Lima Duarte ◽  
Thiago Murilo da Fonseca ◽  
Mary Karlla A. Guimarães
Keyword(s):  
Drying Kinetics ◽  
Coefficient Of Determination ◽  
Maximum Speed ◽  
Foam Layer ◽  
Drying Time ◽  
Constant Weight ◽  
Content Ratio ◽  
Drying Curves ◽  
Foam Drying ◽  
The One

The aim of this work was to determine the drying kinetics in the foam layer of fresh cane broth with the addition of 2,0% Emustab®, 2,0% Super Neutral® and 1,0% phosphate At temperatures of 50, 60 and 70ºC and a total of 0,5 cm of thickness in the foam layer, which will be homogenized in the domestic mixer at the maximum speed for 30 min for foaming formation with approximately 0,500 g/cm3 of density . During the drying process in the foam layer, we monitored the drying kinetics by weighing the trays at regular intervals until we had constant weight. The drying data enabled the calculation of the values of the water content ratio and the construction of drying kinetics curves. Then we constructed the drying curves and adjusted the two-term models Henderson & Pabis, Henderson, Logarithmic, Page and Exponential to the experimental data of the drying kinetics. It was found that the drying temperatures influenced the drying time, in other words the shortest drying time was observed at the highest temperature. Drying times were 665, 545 and 485 minutes at temperatures of 50, 60 and 70°C whilst the thicknesses were 0,5 cm respectively. The drying time has been reduced more rapidly with the increase of the drying air temperature. The Henderson model was the one that described the most satisfactory data of the foam drying, presenting the highest coefficient of determination (0,9935) and the lowest square deviation (0,0007) at the temperature of 50 and thicknesses of 0,5 cm.

The Effect of Investments and Risk Based Capital (RBC) of Tabarru Funds on Company (Case Study of Sharia Insurance in Indonesia for 2014-2019)

2020 ◽  
Vol 8 (1) ◽  
pp. 87-97
Author(s):  
Nana Diana ◽  
Tati Apriani
Keyword(s):  
Life Insurance ◽  
Statistical Tests ◽  
Linear Regression Analysis ◽  
Sampling Technique ◽  
Multiple Linear Regression Analysis ◽  
Insurance Companies ◽  
Coefficient Of Determination ◽  
Verification Method ◽  
Investment Returns ◽  
The Government

This study aims to examine the influence of investment returns and Risk Based Capital (RBC) Tabarru Funds to the profit of sharia life insurance in Indonesia from 2014-2019. This study The type of this research is quantitative research with descriptive verification as a method. This research method uses descriptive verification method with quantitative approach. The data used in this study were sourced from the financial statements of Islamic life insurance companies in Indonesia for the 2014-2019 period. Then the data obtained were analyzed using multiple linear regression analysis and hypothesis testing consisting of t test and f test with the help of SPSS 21 software. The sampling technique uses non probability sampling with purposive sampling technique. Based on the results of the study it can be seen that the development of investment returns on Sharia Life Insurance in Indonesia has fluctuated and even suffered losses. While the development of Risk Based Capital (RBC) has increased and decreased but overall above 120% as determined by the government. Likewise, the profits earned in each year fluctuate. The results of statistical tests show that investment results partially have a positive effect on profit and Risk Based Capital (RBC) of Tabarru funds partially has a negative effect on profit. Simultaneously investment return and Risk Based Capital (RBC) affect on profit. In addition, the results of the coefficient of determination (R2) were obtained which obtained a value of 81%. This shows that the variable investment returns and Risk Based Capital (RBC) can affect earnings by 81% and the remaining 19% is influenced by other variables not used in this study.

scholarly journals Cherry Tomato Drying: Sun versus Convective Oven

Horticulturae ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 40
Author(s):  
Vincenzo Alfeo ◽  
Diego Planeta ◽  
Salvatore Velotto ◽  
Rosa Palmeri ◽  
Aldo Todaro
Keyword(s):  
Moisture Content ◽  
Initial Moisture Content ◽  
Drying Process ◽  
Drying Time ◽  
Oven Drying ◽  
Sun Drying ◽  
Different Temperatures ◽  
Final Water Content ◽  
Drying Curves ◽  
Drying Conditions

Solar drying and convective oven drying of cherry tomatoes (Solanum lycopersicum) were compared. The changes in the chemical parameters of tomatoes and principal drying parameters were recorded during the drying process. Drying curves were fitted to several mathematical models, and the effects of air temperature during drying were evaluated by multiple regression analyses, comparing to previously reported models. Models for drying conditions indicated a final water content of 30% (semidry products) and 15% (dry products) was achieved, comparing sun-drying and convective oven drying at three different temperatures. After 26–28 h of sun drying, the tomato tissue had reached a moisture content of 15%. However, less drying time, about 10–11 h, was needed when starting with an initial moisture content of 92%. The tomato tissue had high ORAC and polyphenol content values after convective oven drying at 60 °C. The dried tomato samples had a satisfactory taste, color and antioxidant values.

scholarly journals Kinetics of drying of basil leaves (Ocimum basilicum L.) in the infrared

2012 ◽  
Vol 16 (12) ◽  
pp. 1346-1352 ◽  
Author(s):  
Renata C. dos Reis ◽  
Ivano A. Devilla ◽  
Diego P. R. Ascheri ◽  
Ana C. O. Servulo ◽  
Athina B. M. Souza
Keyword(s):  
Experimental Data ◽  
Ocimum Basilicum ◽  
Coefficient Of Determination ◽  
Chisquare Test ◽  
The Mean ◽  
Drying Curves ◽  
The One ◽  
Increasing Temperature ◽  
Air Circulation ◽  
Kinetics Of

The objective of this paper was to model the drying curves of the leaves of basil (Ocimum basilicum L.) in the infrared at temperatures of 50, 60, 70 and 80 ºC and to evaluate the influence of drying temperature on the color of dried leaves. Drying was conducted in infrared dryer with temperature and greenhouse air circulation. Experimental data were fitted to eight mathematical models. The magnitude of the coefficient of determination (R²), the mean relative error (P), the estimated mean error (SE) and chisquare test (χ2) were used to verify the degree of fitness of the models. From the study it was concluded that: a) the behavior of the drying curves of basil leaves was similar to most agricultural products, the drying times in the infrared were less than the drying times in an oven with air circulation, b) the mathematical drying model proposed by Midilli et al. (2002) was the one which best adjusted to the experimental data, c) the diffusion coefficient ranged from 9.10 x 10-12 to 2.92 x 10-11 m² s-1 and d) the color of the samples was highly influenced by drying, becoming darker due to loss of chlorophyll with increasing temperature.

Sign in / Sign up

Export Citation Format

Share Document