High Temperature Spouted Bed Paddy Drying with Varied Downcomer Air Flows and Moisture Contents: Effects on Drying Kinetics, Critical Moisture Content, and Milling Quality

2005 ◽  
Vol 23 (3) ◽  
pp. 473-495 ◽  
Author(s):  
Thanid Madhiyanon ◽  
Somchart Soponronnarit
Keyword(s):  
High Temperature ◽  
Moisture Content ◽  
Drying Kinetics ◽  
Spouted Bed ◽  
Critical Moisture Content ◽  
Milling Quality ◽  
Moisture Contents ◽  
Critical Moisture ◽  
Air Flows

scholarly journals Propagation probability and spread rates of self-sustained smouldering fires under controlled moisture content and bulk density conditions

2016 ◽  
Vol 25 (4) ◽  
pp. 456 ◽  
Author(s):  
Nuria Prat-Guitart ◽  
Guillermo Rein ◽  
Rory M. Hadden ◽  
Claire M. Belcher ◽  
Jon M. Yearsley
Keyword(s):  
Moisture Content ◽  
Bulk Density ◽  
Infrared Camera ◽  
Fire Spread ◽  
Spread Rate ◽  
Critical Moisture Content ◽  
Moisture Contents ◽  
Milled Peat ◽  
Critical Moisture ◽  
Smouldering Combustion

The consumption of large areas of peat during wildfires is due to self-sustained smouldering fronts that can remain active for weeks. We studied the effect of peat moisture content and bulk density on the horizontal propagation of smouldering fire in laboratory-scale experiments. We used milled peat with moisture contents between 25 and 250% (mass of water per mass of dry peat) and bulk densities between 50 and 150 kg m–3. An infrared camera monitored ignition, spread and extinction of each smouldering combustion front. Peats with a bulk density below 75 kg m–3 and a moisture content below 150% self-sustained smouldering propagation for more than 12 cm. Peat with a bulk density of 150 kg m–3 could self-sustain smouldering propagation up to a critical moisture content of 115%. A linear model estimated that increasing both moisture content and bulk density significantly reduced the median fire spread rate (which ranged between 1 and 5 cm h–1). Moisture content had a stronger effect size on the spread rate than bulk density. However, the effect of bulk density on spread rate depends upon the moisture content, with the largest effect of bulk density at low moisture contents.

scholarly journals Study of the forms of moisture bond in coriander seeds based on analysis of drying kinetics

2020 ◽  
Vol 82 (3) ◽  
pp. 24-31
Author(s):  
S. T. Antipov ◽  
D. A. Kazartsev ◽  
A. M. Davydov ◽  
A. B. Emelyanov
Keyword(s):  
Moisture Content ◽  
The State ◽  
Binding Energies ◽  
Drying Kinetics ◽  
Rate Of Change ◽  
Qualitative Assessment ◽  
Laboratory Research ◽  
Critical Moisture Content ◽  
Critical Moisture ◽  
Kinetics Of

The article deals with the issues related to the study of the forms of connection of moisture removed during the drying of coriander seeds. A study was carried out to determine the quantitative moisture content of various forms of communication by two methods and a comparative analysis was carried out. It is shown that the existing methods for studying the forms of moisture-material bond have significant drawbacks and generally give a qualitative assessment of the state of moisture in the material or are very laborious and require lengthy laboratory research. An approach is proposed to determine the forms of moisture bond in coriander seeds based on graph-analytical analysis of the drying kinetics, which makes it possible to qualitatively and quantitatively assess the state of moisture in the seeds. With the help of a graphical editor, the curves of the kinetics of drying of coriander seeds were processed and the dependences of the value characterizing the rate of change in the rate of drying of coriander seeds on the moisture content of the product were obtained, and the introduction of a new concept into the theory of drying of this value as "acceleration of drying" was proposed. The analysis of the obtained curves is carried out, indicating the presence of extrema and points of inflection to the corresponding critical moisture content, as well as the presence of areas with a slowdown or acceleration of the drying rate change, which make it possible to establish the intervals of moisture removal with different binding energies. The approach considered in the article to determine the forms of moisture bond in coriander seeds will allow not only to give a qualitative and quantitative assessment of the state of moisture in products, but also to reduce the time spent on analysis and increase the accuracy of the results.

Developing a Linearization Method to Determine Optimum Blending for Surimi with Varied Moisture Contents Using Linear Programming

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Hyeon W. Park ◽  
Jae W. Park ◽  
Won B. Yoon
Keyword(s):  
Linear Programming ◽  
Moisture Content ◽  
Standard Procedure ◽  
Unit Cost ◽  
Linearization Method ◽  
Model Parameters ◽  
Additional Information ◽  
Moisture Contents ◽  
Design Variables ◽  
Critical Moisture

AbstractNovel algorithm to determine the least cost formulation of a surimi blend was developed using linear programming (LP). Texture properties and the unit cost of surimi blend at the target moisture content were used as constraint functions and the objective function, respectively. The mathematical models to describe the moisture content dependence of the ring tensile properties were developed using critical moisture content, and the model parameters were used for the least cost LP (LCLP) model. The LCLP model successfully predicted the quality of surimi blend. Sensitivity analysis was used to obtain an additional information when the perturbations of design variables are provided. A standard procedure to determine the least cost formulation for blending surimi with varied moisture contents was systematically developed.

scholarly journals A New Concept of Applying Methanol to Dry Cellulose Insulation at the Stage of Manufacturing a Transformer

Energies ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1658 ◽  
Author(s):  
Piotr Przybylek
Keyword(s):  
High Temperature ◽  
Moisture Content ◽  
Power Transformers ◽  
Technical Challenge ◽  
Moisture Contents ◽  
Percentage Points ◽  
Time Period ◽  
Drying Techniques ◽  
Heating Up ◽  
Cellulose Insulation

A decisive technical challenge for transformer manufacturers is correctly drying the cellulose insulation. During the production of a transformer, it is necessary to reduce its insulation’s moisture content from about 8% to less than 1% in the shortest possible time period. The drying of insulation is a time-consuming process, and for high-power transformers, it can last up to three weeks. Several drying techniques are used during the production of a transformer, and all of them require heating up the insulation to a high temperature and applying a vacuum. Unfortunately, the use of a high drying temperature above 100 °C can cause a decrease in the degree of cellulose polymerization by over a dozen percentage points. This paper presents a new concept for drying cellulose insulation that does not require heating insulation and applying a vacuum. In this solution, methanol is used as the drying medium. The research results showed the possibility of drying cellulose insulation by means of methanol with different initial moisture contents. The possibility of completely drying pressboard of various thicknesses for a sufficient period of time was also proven. The paper also presents a new concept of both the device and the procedure for drying cellulose insulation by means of methanol.

Study on Critical Moisture Content of Unsaturated Evaporation

2014 ◽  
Vol 513-517 ◽  
pp. 2643-2646
Author(s):  
Hua Zhang ◽  
Wen Long Hu ◽  
Jin Lu Cao
Keyword(s):  
Moisture Content ◽  
Thin Layer ◽  
Measuring System ◽  
Evaporation Process ◽  
Critical Moisture Content ◽  
Whole Process ◽  
Critical Moisture ◽  
Three Stages ◽  
Soil Water Characteristic Curves ◽  
Water Contents

Thin layer evaporation tests of three types of soil were conducted by a newly designed humidity-controllable evaporation and penetration measuring system and lasted for 8 days. The whole process of sample mass variation from wet to dry was recorded in the laboratory. The critical moisture content and air-dried moisture content were obtained from evaporation curve, which divided the evaporation process of thin layer unsaturated soil into three stages, including stable rate stage, reducing rate stage and residual stage. The soil water characteristic curves of soils were predicted by Arya and Paris model, the results showed that the critical moisture contents of evaporation process were the same with the water contents corresponding to residue values of SWCC, it is significant to studying on unsaturated evaporation process.

scholarly journals Isotermas de adsorção de umidade e cinética de secagem de sementes de trevo persa (Trifolium resupinatum L.) e trevo vesiculoso (Trifolium vesiculosum) ¬¬¬¬

2020 ◽  
Vol 28 ◽  
pp. 535-548
Author(s):  
Gabriela Saldanha Soares ◽  
Scarlet Neves Tuchtenhagen ◽  
Luiz Antonio de Almeida Pinto ◽  
Carlos Alberto Severo Felipe
Keyword(s):  
Moisture Content ◽  
Adsorption Isotherms ◽  
Effective Diffusivity ◽  
Drying Kinetics ◽  
Peleg Model ◽  
Critical Moisture ◽  
Persian Clover ◽  
Trifolium Vesiculosum ◽  
Kinetics Of ◽  
Trifolium Resupinatum

The aim of this work was to obtain adsorption isotherms and to study the drying kinetics of persian clover (Trifolium resupinatum L.) and arrowleaf clover (Trifolium vesiculosum) seeds, in addition, fitting the experimental data by the predicted models of the literature. The equilibrium moisture content and the moisture adsorption behavior were found by isotherms curves at 40, 45 and 50 ºC, and the Peleg model was the most suitable. The drying kinetics was determined by thin layer assays in an air parallel flow dryer at all three temperatures. In addition, it was demonstrated the predominance of the falling drying rate period for the two species of seeds, and the critical moisture content values were approximately of 0.20 and 0.25 gwater gdry matter-1 for persian clover and arrowleaf clover seeds, respectively. The effective diffusivity values were estimated in ranges of values of 3.61×10-11 – 6.81×10-11 m² s-1 for persian clover and 6.76×10-11 – 1.15×10-10 m²s-1 for arrowleaf clover seeds and the temperature effect was expressed by an Arrhenius relation. Thus, drying kinetics confirmed the greater difficulty in moisture removal from the arrowleaf clover seeds, compared to the persian clover seeds drying, in agreement with the results obtained through adsorption isotherms.

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