Unified calibration method for nondestructive dielectric sensing of moisture content in granular materials

1999 ◽  
Vol 35 (16) ◽  
pp. 1346 ◽  
Author(s):  
S. Trabelsi ◽  
A.W. Krazsewski ◽  
S.O. Nelson
Keyword(s):  
Moisture Content ◽  
Granular Materials ◽  
Calibration Method

Models of pressure compaction and their application for wheat meal

2014 ◽  
Vol 28 (1) ◽  
pp. 125-130 ◽  
Author(s):  
Stanisław Skonecki ◽  
Ryszard Kulig ◽  
Grzegorz Łysiak
Keyword(s):  
Moisture Content ◽  
Granular Materials ◽  
Plant Material ◽  
Experimental Results ◽  
Plant Origin ◽  
Model Equations ◽  
Physical Phenomena

Abstract Processes of compaction of granular materials were described using selected models. The analysis of their accuracy on the example of wheat was the basis for the discussion on their applicability to the processing of plant-origin materials. Parameters of the model equations for wheat, compressed at 10-18% moisture content were calculated, and the relations between these parameters and wheat moisture were determined. It was found that the analyzed models described the pressure compaction of granular plant material with different accuracy, and were highly dependent on moisture. The study also indicated that the model of Ferrero et al. fits the experimental results well. The parameters of this model reflected very well the physical phenomena which occur during compression.

Simplified model for light scattering from granular materials with varying moisture content

2013 ◽  
Vol 52 (17) ◽  
pp. 4006 ◽  
Author(s):  
Sara Rosendahl ◽  
Johan Casselgren ◽  
Mikael Sjödahl
Keyword(s):  
Light Scattering ◽  
Moisture Content ◽  
Granular Materials ◽  
Simplified Model

scholarly journals Soil moisture monitoring at the field scale using neutron probe

2014 ◽  
Vol 51 (3) ◽  
pp. 332-345 ◽  
Author(s):  
J. Kodikara ◽  
P. Rajeev ◽  
D. Chan ◽  
C. Gallage
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Soil Layer ◽  
Calibration Method ◽  
Flow Equation ◽  
Wetting Front ◽  
Wet Season ◽  
Buried Structures ◽  
Neutron Probe ◽  
Moisture Variation

Measurement of the moisture variation in soils is required for geotechnical design and research because soil properties and behavior can vary as moisture content changes. The neutron probe, which was developed more than 40 years ago, is commonly used to monitor soil moisture variation in the field. This study reports a full-scale field monitoring of soil moisture using a neutron moisture probe for a period of more than 2 years in the Melbourne (Australia) region. On the basis of soil types available in the Melbourne region, 23 sites were chosen for moisture monitoring down to a depth of 1500 mm. The field calibration method was used to develop correlations relating the volumetric moisture content and neutron counts. Observed results showed that the deepest “wetting front” during the wet season was limited to the top 800 to 1000 mm of soil whilst the top soil layer down to about 550 mm responded almost immediately to the rainfall events. At greater depths (550 to 800 mm and below 800 mm), the moisture variations were relatively low and displayed predominantly periodic fluctuations. This periodic nature was captured with Fourier analysis to develop a cyclic moisture model on the basis of an analytical solution of a one-dimensional moisture flow equation for homogeneous soils. It is argued that the model developed can be used to predict the soil moisture variations as applicable to buried structures such as pipes.

THE INFLUENCE OF SELECTED FACTORS UPON THE VALUE OF EXTERNAL FRICTION CONCERNING PLANT GRANULAR MATERIALS

Tribologia ◽  
2017 ◽  
pp. 107-113 ◽  
Author(s):  
Artur WÓJCIK ◽  
Jarosław FRACZEK
Keyword(s):  
Mathematical Model ◽  
Moisture Content ◽  
Granular Materials ◽  
Friction Force ◽  
Statistical Significance ◽  
Sliding Velocity ◽  
Seed Moisture Content ◽  
Seed Moisture ◽  
High Statistical Significance ◽  
Insight Into

The issues relating to the description of friction with regard to plant granular materials are fairly complicated due to a variety of factors determining the process. Considering each factor in isolation is insufficient and offers a limited insight into the phenomenon of friction. Therefore, the paper presents the research results concerning the influence of three independent factors (seed moisture content, sliding velocity, load) upon the value of friction force. The analysis showed the high statistical significance of the factors at play. The proposed mathematical model proved well fitted (considering granular materials) to the observed outcome of the measurements.

Specific Heat and Volumetric Heat Capacity of Granular Materials as Affected by Moisture and Density

2014 ◽  
Vol 575 ◽  
pp. 103-107 ◽  
Author(s):  
Nidal H. Abu-Hamdeh
Keyword(s):  
Heat Capacity ◽  
Moisture Content ◽  
Specific Heat ◽  
Granular Materials ◽  
Sandy Soil ◽  
Laboratory Experiments ◽  
Soil Density ◽  
Laboratory Studies ◽  
Volumetric Heat Capacity ◽  
Loam Soil

The granular materials examined in this study were some Saudian soils. The effect of water content and bulk density on the specific heat and volumetric heat capacity of two Saudian soils (sand and loam) was investigated through laboratory studies. These laboratory experiments used the calorimetric method to determine specific heat of soils. For the type of soils studied, specific heat increased with increased moisture content. Also, volumetric heat capacity increased with increased moisture content and soil density. The volumetric heat capacity and specific heat of soils observed were compared with independent estimates made using derived theoretical relations. The differences between the observed and predicted results were very small. Loam soil generally had higher specific heat and volumetric heat capacity than sandy soil for the same moisture content and soil density.

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