scholarly journals On mathematical modelling of heat and moisture distribution in the drying process for porous two layered gypsum board products

2017 ◽  
Author(s):  
Aivars Aboltins ◽  
Harijs Kalis ◽  
Ilmars Kangro
Keyword(s):  
Mathematical Modelling ◽  
Moisture Distribution ◽  
Drying Process ◽  
Gypsum Board ◽  
Heat And Moisture

Mathematical Models of Papermaking

2001 ◽  
Vol 6 (1) ◽  
pp. 9-19 ◽  
Author(s):  
A. Buikis ◽  
J. Cepitis ◽  
H. Kalis ◽  
A. Reinfelds ◽  
A. Ancitis ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Initial Value Problems ◽  
Moisture Transfer ◽  
Bound Water ◽  
Drying Process ◽  
Initial Value ◽  
First Order ◽  
Heat And Moisture ◽  
The Mathematical Model ◽  
The Web

The mathematical model of wood drying based on detailed transport phenomena considering both heat and moisture transfer have been offered in article. The adjustment of this model to the drying process of papermaking is carried out for the range of moisture content corresponding to the period of drying in which vapour movement and bound water diffusion in the web are possible. By averaging as the desired models are obtained sequence of the initial value problems for systems of two nonlinear first order ordinary differential equations. 

scholarly journals Temperature and moisture distribution in a highway in south-eastern Kazakhstan

2019 ◽  
Vol 265 ◽  
pp. 02005 ◽  
Author(s):  
Bagdat Teltayev ◽  
Elena Suppes
Keyword(s):  
Air Temperature ◽  
Moisture Distribution ◽  
Structural Elements ◽  
Moisture Variation ◽  
Special Measurement ◽  
Measurement Devices ◽  
Depth Increase ◽  
And Migration ◽  
Heat And Moisture ◽  
Air Temperature Variations

The matters of investigation for water thermal regime of pavement and subgrade structures of the highways are especially important as the moisture and temperature distribution in pavement and subgrade layers impact greatly on their deformation and strength indicators. Experimental results, which can be obtained by special measurement devices, are primary ones for establishing of peculiarities and regularities for distribution and migration of heat and moisture in the mentioned structural elements of the highways. Special measurement devices are required to obtain such experimental data. The paper shows the results for analysis of temperature and moisture variation in points of pavement and subgrade of “Almaty-Bishkek” highway. Temperature measurement has been performed by set of special sensors. Regular temperature and moisture measurement have been performed for the period from September 18, 2015 to June 2, 2016. Regularities for temperature regime variation in points of pavement for 24 hours are coordinated with air temperature variations. Amplitude of vibration for temperature is decreased with the depth increase. Moisture in subgrade points is gradually decreased with the reduction of daily average air temperature.

Analytical solution for heat and moisture diffusion in layered materials

2010 ◽  
Vol 47 (6) ◽  
pp. 595-608 ◽  
Author(s):  
Jeongwoo Lee ◽  
Ji-Tae Kim ◽  
Il-Moon Chung ◽  
Nam Won Kim
Keyword(s):  
Analytical Solutions ◽  
Numerical Solutions ◽  
Integral Transform ◽  
Moisture Diffusion ◽  
Layered Materials ◽  
Diffusion Problem ◽  
Moisture Distribution ◽  
Coupled Flow ◽  
Coupled Diffusion ◽  
Heat And Moisture

The study of heat and moisture flows in multiple layers of different materials that make up the unsaturated zone is of great importance when characterizing the behaviour of these materials. In the present paper, analytical solutions of the one-dimensional heat and moisture coupled diffusion problem for layered materials under two different sets of boundary conditions are proposed. The coupled flow of heat and moisture are assumed to follow the theory of Philip and De Vries, and the solutions are derived analytically using integral transform methods. A comparison between the analytical and numerical solutions for one example problem shows satisfactory results. Furthermore, a procedure is presented for estimating heat and moisture distribution profiles in any layered materials using the derived analytical solutions. It is expected that the proposed analytical solutions will be used effectively for preliminary analyses of coupled heat and moisture movements in unsaturated porous media.

scholarly journals Analysis of heat and moisture transfer during drying of urea particles

2019 ◽  
Vol 25 (2) ◽  
pp. 171-182
Author(s):  
Bahram Torkashvand ◽  
Sina Gilassi ◽  
Reza Moghadam
Keyword(s):  
Moisture Transfer ◽  
Real Data ◽  
Operating Conditions ◽  
Moisture Loss ◽  
Drying Process ◽  
Steady State Condition ◽  
Agricultural Industry ◽  
Operational Issues ◽  
Heat And Moisture ◽  
Cooling Air

Urea is an inexpensive form of nitrogen fertilizer which is widely used in the agricultural industry. Urea as granule is produced through a drying process by which moisture content decreases to avoid operational issues. In this study, a numerical model is proposed for the drying of urea particles in the prilling process. The model is developed based on mass, heat, and hydrodynamic transfer equations for the urea particles and cooling air. The moisture and temperature variations of particles and cooling air at different heights of the prilling tower are calculated under different operating conditions. The shrinkage of particles due to the moisture loss during the drying process at different heights of the tower is considered. The model is validated with the real data obtained from a urea drying plant operated under steady-state condition. The result highlights that the model can be used to manipulate the operating parameters to improve product quality and to minimize urea temperature to prevent lamps and caking formation in the tower.

scholarly journals Mathematical modelling of the drying process of sugar beet pulp with macro and microelement additions in order to improve the feed quality

2020 ◽  
Vol 180 ◽  
pp. 03020
Author(s):  
Elena Mihaela Nagy ◽  
Constantin Coţa ◽  
Zoltan Gyorgy ◽  
Teodora Deac
Keyword(s):  
Mathematical Model ◽  
Sugar Beet ◽  
Phosphoric Acid ◽  
Mathematical Modelling ◽  
Animal Feed ◽  
Hydrated Lime ◽  
Experimental Measurements ◽  
Drying Process ◽  
Beet Pulp ◽  
The Mathematical Model

In this paper a kinetic study is performed on the drying process of beet pulp with additions of macro-elements (Ca2+, Mg 2+, PO42+) from hydrated lime, hydrated dolomite lime, phosphoric acid and microelements (Co2+, Zn 2+, Fe2+, Mn2+), with the purpose of obtaining premixes with substantially improved value for animal feed. The experimental measurements made served to elaborate the mathematical model by means of which the speed with which the drying process is carried out is described, thus being able to calculate the stationing time of the material in the dryer. The equations for calculating the stationary time of the material in the dryer can be used for designing dryers (sizing them).

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