scholarly journals RESEARCH OF PLUM DRYING PROCESS

2015 ◽  
Vol 3 ◽  
pp. 494-5 ◽  
Author(s):  
Nurlan Kurmanov ◽  
Azret Shingissov ◽  
Gulzhan Kantureyeva ◽  
Zeinep Nurseitova ◽  
Baurzhan Tolysbaev ◽  
...  
Keyword(s):  
Acid Content ◽  
Ascorbic Acid Content ◽  
Drying Method ◽  
Drying Process ◽  
Air Velocity ◽  
Hot Air ◽  
Sensory Parameters ◽  
Air Dryer ◽  
Kinetics Of

In this study, the drying kinetics of a domestic plum cultivar were examined in a laboratory scale hot-air dryer, SHS-80, at an air velocity of 0.65m s-1 and within the air temperature range of 45 – 75 0С. It was found that the whole fruit dried the best. Also, the study  assessed the influence of the drying method on the quality of the domestic plum cultivar. Dried fruits were assessed for sensory parameters and ascorbic acid content. Studies have shown thatthe proposed method of drying, yields a higher absorbic acid content for the dried product  than the conventional approach.

scholarly journals Analisis Kecepatan Aliran Fluida terhadap Kinerja Kolektor Surya yang Bergerak Mengikuti Posisi Matahari

2019 ◽  
Vol 12 (1) ◽  
pp. 12-21
Author(s):  
Feby Nopriandy ◽  
Suhendra Suhendra
Keyword(s):  
Data Collection ◽  
Solar Radiation ◽  
Solar Collector ◽  
Flow Speed ◽  
Drying Method ◽  
Drying Process ◽  
Air Velocity ◽  
Hot Air ◽  
Fixed Condition

Abstrak. Metode pengeringan menggunakan surya sebagai sumber energi panas adalah metode pengeringan yang banyak digunakan. Besarnya panas yang dihasilkan tergantung dari jumlah radiasi matahari yang dapat ditangkap oleh kolektor surya. Tangkapan radiasi matahari dapat dioptimalkan dengan merekayasa kolektor surya yang dapat bergerak mengikuti posisi matahari. Kualitas produk pangan yang dikeringkan sangat dipengaruhi oleh aliran udara panas pada proses pengeringan. Berdasarkan permasalahan tersebut, perlu dilakukan kajian tentang aliran udara panas pada kolektor surya yang bergerak mengikuti posisi matahari. Penelitian menggunakan 2 buah kolektor surya yang direkayasa dengan ukuran, bentuk dan bahan yang sama dimana salah satu kolektor berada dalam kondisi tetap dan kolektor lainnya dapat bergerak mengikuti posisi matahari. Kecepatan aliran udara panas yang keluar dari saluran keluar (outlet) kolektor surya divariasikan menjadi 3 perlakuan yaitu 2 m/s, 4 m/s dan 6 m/s. Pengambilan data dimulai dari pukul 08.00 sampai pukul 16.00 dengan selang waktu pengambilan data adalah setiap 30 menit. Hasil analisis menunjukkan bahwa kecepatan udara panas pada outlet kolektor surya sangat berbeda nyata pengaruhnya terhadap nilai temperatur udara panas di dalam dan outlet kolektor surya. Kolektor surya yang bergerak mengikuti posisi matahari dapat meningkatkan performansi temperatur di dalam dan outlet kolektor surya pada berbagai kondisi kecepatan udara outlet berbanding kolektor surya tetap. Kenaikan performansi tertinggi di dalam dan outlet kolektor surya diperoleh pada kecepatan udara outlet 2 m/s masing-masing sebesar 16,29% dan 3,98%.  Analysis of Fluid Flow Speed on Solar Collector Performance which Moves to follow the Position of the Sun Abstract. The drying method using solar as a source of heat energy is a widely used drying method. The amount of heat produced depends on the amount of solar radiation that can be collected by solar collector. The capture of solar radiation can be optimized by construction the solar collector that can move in the sun's position. The quality of dried food products is strongly influenced by the flow of hot air in the drying process. Based on these problems, it is necessary to study the flow of hot air in solar collectors that move in the sun's position. The study used 2 units of solar collector that construction with the same size, shape and material where one of the collectors is in a fixed condition and the other collector can move in the sun's position. The velocity of hot air flowing out of the outlet of the solar collector was varied into 3 treatments, namely 2 m/s, 4 m/s and 6 m/s. Data collection starts at 8:00 a.m. until 16:00 p.m. with an interval of data collection is every 30 minutes. The results of the analysis show that the hot air velocity at the solar collector outlet has a very different effect on the temperature value of hot air inside and the solar collector outlet. Solar collector that move in the sun's position can increase the temperature performance in and solar collector outlets in various conditions of outlet air velocity. The highest increase in performance in and solar collector outlets was obtained at outlet air velocity of 2 m / s at 16.29% and 3.98% respectively.

scholarly journals Kinetic parameters identification of conductive enhanced hot air drying process of food waste

2020 ◽  
pp. 223-223
Author(s):  
Mihailo Milanovic ◽  
Mirko Komatina ◽  
Ivan Zlatanovic ◽  
Nebojsa Manic ◽  
Dragi Antonijevic
Keyword(s):  
Food Industry ◽  
Convective Drying ◽  
Diffusivity Coefficient ◽  
Drying Method ◽  
Drying Process ◽  
Air Velocity ◽  
Drying Time ◽  
Hot Air ◽  
Air Temperatures ◽  
Drying Curves

The efficient utilization of waste from food industry is possible after thermal treatment of the material. This treatment should be economically feasible and compromise the energy efficient drying process. The main goal of this investigation is to determine drying characteristics of nectarine pomace as a waste from food industry. The measurements were performed in an experimental dryer by combined conductive-convective drying method with disk-shaped samples of 5, 7 and 10mm thickness and 100 mm in diameter at the air temperatures of 30, 40, 50, 60 and 70oC, hot plate temperatures of 50, 60 an 70oC and air velocity of 1.5 m/s. The drying curves were compared to a few semi-theoretical mathematical models. The Logarithmic model showed the best correspondence. On the basis of experiments, it is determined that the drying process takes place in a falling rate period and it is accepted that the main mechanism of moisture removal is diffusion. The effective coefficient of diffusion was determined using experimental results by calculating the slope of the drying curves. Drying time and equilibrium moisture are determined for each experiment. Analysis of drying curves showed that the conductive-enhanced drying method reduces drying times and increases the diffusivity coefficient. The character of drying rate curves for conductive-enhanced drying was analyzed and compared with pure convective drying of nectarine pomace.

scholarly journals DRYING CHARACTERISTICS AND KINETICS OF LOVASTATIN DEGRADATION OF OYSTER MUSHROOM (PLEUROTUS OSTREATUS) SLICES

2019 ◽  
Vol 49 (4) ◽  
pp. 269-274
Author(s):  
Engin Demiray
Keyword(s):  
Reaction Model ◽  
Oyster Mushroom ◽  
Coefficient Of Determination ◽  
Drying Process ◽  
Chi Square ◽  
Drying Characteristics ◽  
First Order ◽  
Hot Air ◽  
Air Dryer ◽  
Kinetics Of

Oyster mushroom slices were dried using hot air dryer. The lovastatin content in oyster mushroom slices during drying was evaluated at 45, 55 and 65˚C. The first-order reaction model adequately described degradation of lovastatin. In this study, the modeling of the drying process was also performed. Four mathematical models were fitted to the experimental data. The performance of these models is evaluated by comparing the coefficient of determination, root mean square error and reduce chi-square between the observed and predicted moisture ratio. The Page model gave the best results for describing drying of oyster mushroom slices.

scholarly journals Modeling of mass transfer performance of hot-air drying of sweet potato (Ipomoea Batatas L.) slices

2014 ◽  
Vol 20 (2) ◽  
pp. 171-181 ◽  
Author(s):  
Aishi Zhu ◽  
Feiyan Jiang
Keyword(s):  
Diffusion Coefficient ◽  
Sweet Potato ◽  
Moisture Diffusion ◽  
Drying Process ◽  
Air Velocity ◽  
Potato Slice ◽  
Moisture Diffusion Coefficient ◽  
Hot Air ◽  
Effective Moisture ◽  
Air Dryer

In order to investigate the transfer characteristics of the sweet potato drying process, a laboratory convective hot air dryer was applied to study the influences of drying temperature, hot air velocity and thickness of sweet potato slice on the drying process. The experimental data of moisture ratio of sweet potato slices were used to fit the mathematical models, and the effective diffusion coefficients were calculated. The result showed that temperature, velocity and thickness influenced the drying process significantly. The Logarithmic model showed the best fit to experimental drying data for temperature and the Wang and Singh model were found to be the most satisfactory for velocity and thickness. It was also found that, with the increase of temperature from 60 to 80?C, the effective moisture diffusion coefficient varied from 2.962?10-10 to 4.694?10-10 m2?s-1, and it fitted the Arrhenius equation, the activation energy was 23.29 kJ?mol-1; with the increase of hot air velocity from 0.423 to 1.120 m?s-1, the values of effective moisture diffusion coefficient varied from 2.877?10-10 to 3.760?10-10 m2?s-1; with the increase of thickness of sweet potato slice from 0.002 m to 0.004 m, the values of effective moisture diffusion coefficient varied from 3.887?10-10 to 1.225?10-9 m2?s-1.

scholarly journals Effects of Osmotic Dehydration on the Hot Air Drying of Apricot Halves: Drying Kinetics, Mass Transfer, and Shrinkage

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 202
Author(s):  
Ivan Pavkov ◽  
Milivoj Radojčin ◽  
Zoran Stamenković ◽  
Krstan Kešelj ◽  
Urszula Tylewicz ◽  
...  
Keyword(s):  
Activation Energy ◽  
Osmotic Dehydration ◽  
Effective Diffusivity ◽  
Drying Process ◽  
Air Velocity ◽  
Hot Air Drying ◽  
Drying Time ◽  
Air Drying ◽  
Hot Air ◽  
Kinetics Of

This study aimed to determine the effects of osmotic dehydration on the kinetics of hot air drying of apricot halves under conditions that were similar to the industrial ones. The osmotic process was performed in a sucrose solution at 40 and 60 °C and concentrations of 50% and 65%. As expected increased temperatures and concentrations of the solution resulted in increased water loss, solid gain and shrinkage. The kinetics of osmotic dehydration were well described by the Peleg model. The effective diffusivity of water 5.50–7.387 × 10−9 m2/s and solute 8.315 × 10−10–1.113 × 10−9 m2/s was calculated for osmotic dehydration. Hot air drying was carried out at 40, 50, and 60 °C with air flow velocities of 1.0 m/s and 1.5 m/s. The drying time shortened with higher temperature and air velocity. The calculated effective diffusion of water was from 3.002 × 10−10 m2/s to 1.970 × 10−9 m2/s. The activation energy was sensitive to selected air temperatures, so greater air velocity resulted in greater activation energy: 46.379–51.514 kJ/mol, and with the osmotic pretreatment, it decreased to 35.216–46.469 kJ/mol. Osmotic dehydration reduced the effective diffusivity of water during the hot air drying process. It also resulted in smaller shrinkage of apricot halves in the hot air drying process.

scholarly journals Silicon attenuates calcium deficiency by increasing ascorbic acid content, growth and quality of cabbage leaves

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dalila Lopes da Silva ◽  
Renato de Mello Prado ◽  
Luis Felipe Lata Tenesaca ◽  
José Lucas Farias da Silva ◽  
Ben-Hur Mattiuz
Keyword(s):  
Ascorbic Acid ◽  
Nutrient Solution ◽  
Acid Content ◽  
Dry Matter ◽  
Ascorbic Acid Content ◽  
Calcium Deficiency ◽  
Ca Deficiency ◽  
Leaf Water Loss ◽  
Nutrient Solutions

AbstractCalcium (Ca) deficiency in cabbage plants induces oxidative damage, hampering growth and decreasing quality, however, it is hypothesized that silicon (Si) added to the nutrient solution may alleviate crop losses. Therefore, this study aims at evaluating whether silicon supplied in the nutrient solution reduces, in fact, the calcium deficiency effects on cabbage plants. In a greenhouse, cabbage plants were grown using nutrient solutions with Ca sufficiency and Ca deficiency (5 mM) without and with added silicon (2.5 mM), arranged as a 2 × 2 factorial in randomized blocks, with five replications. At 91 days after transplanting, the plants were harvested for biological evaluations. In the treatment without added Si, Ca deficiency promoted oxidative stress, low antioxidant content, decreased dry matter, and lower quality leaf. On the other hand, added Si attenuated Ca deficiency in cabbage by decreasing cell extravasation while increasing both ascorbic acid content and fresh and dry matter, providing firmer leaves due to diminished leaf water loss after harvesting. We highlighted the agronomic importance of Si added to the nutrient solution, especially in crops at risk of Ca deficiency.

Design, development, and drying kinetics of infrared‐assisted hot air dryer for turmeric slices

2021 ◽  
Author(s):  
G. Jeevarathinam ◽  
R. Pandiselvam ◽  
T. Pandiarajan ◽  
P. Preetha ◽  
T. Krishnakumar ◽  
...  
Keyword(s):  
Drying Kinetics ◽  
Design Development ◽  
Hot Air ◽  
Air Dryer ◽  
Kinetics Of

HOT-AIR DRYING AND MODELING THE DRYING KINETICS OF SUNFLOWER (HELIANTHUS ANNUS L.) PETALS

2020 ◽  
Vol 23 (3) ◽  
Author(s):  
Amir Hossein Mirzabe ◽  
◽  
Gholam Reza Chegini ◽  
Keyword(s):  
Economic Value ◽  
Cost Effective ◽  
Moisture Diffusivity ◽  
Drying Kinetics ◽  
Sunflower Seeds ◽  
Hot Air ◽  
Thin Layer Drying ◽  
Helianthus Annus ◽  
Air Dryer ◽  
Kinetics Of

Sunflower seeds and oil in food and agricultural processing are of great importance. Dried sunflower petals are the most important parts of the sunflower plant that have economic value. Thin-layer drying experiments were performed in a laboratory scale hot-air dryer. The results indicated that with increasing drying temperature and air velocity, time of drying reduces and in most cases, the logarithmic model had the best performance for modeling the drying kinetics. The calculated values of the effective moisture diffusivity varied from 3.16627 ×10-13 to 1.32860 ×10-12 m2 s-1 and the values of the activation energy for air velocities of 0.4 and 0.8 m s-1 were equal to 51.21 and 42.3 kJ mol-1, respectively. Also, to verify whether the production and sale of sunflower petals can be cost effective, economic analysis was done. This analysis showed that drying of sunflower petals is profitable process and the generated revenue can even surpass the revenue from the sale of sunflower seeds.

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