Thermal properties of gram

Dutta, Soumik; Nema, V.K.; Bhardwaj, R. K.

doi:10.1016/0021-8634(88)90148-5

Cited by 52 publications

(47 citation statements)

References 5 publications

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“…However, measured values did not show this consistent relationship with moisture content and bulk density. Ascending, descending, and mixed trends of the relationship between thermal diffusivity and moisture content have been reported (Houkom et al, 1974;Verdonck et al, 1978;Jiang et al, 1986;Dutta et al, 1988;Bristow, 1998;Iwabuchi et al, 1999;Labance et al, 2006;Opoku et al, 2006). Bulk density shows relatively more significant increases than thermal conductivity when moisture content is increased, which may explain the descending trends and vice versa.…”

Section: Resultsmentioning

confidence: 96%

“…The linear relationships of thermal conductivity and volumetric heat capacity with moisture content and bulk density have been reported by many researchers (Bristow, 1998;Yang et al, 2002;Chandrakanthi et al, 2005;Opoku et al, 2006). However, numerous studies have proven there is no relationship between the thermal diffusivity and both the moisture content and bulk density (Houkom et al, 1974;Verdonck et al, 1978;Jiang et al, 1986;Dutta et al, 1988;Bristow, 1998;Iwabuchi et al, 1999;Yang et al, 2002;Labance et al, 2006;Opoku et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Determination of thermal properties of composting bulking materials

Ahn

Sauer²,

Richard

et al. 2009

Bioresource Technology

102

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Thermal properties of compost bulking materials affect temperature and biodegradation during the composting process. Well determined thermal properties of compost feedstocks will therefore contribute to practical thermodynamic approaches. Thermal conductivity, thermal diffusivity, and volumetric heat capacity of 12 compost bulking materials were determined in this study. Thermal properties were determined at varying bulk densities (1, 1.3, 1.7, 2.5, and 5 times uncompacted bulk density), particle sizes (ground and bulk), and water contents (0, 20, 50, 80% of water holding capacity and saturated condition). For the water content at 80% of water holding capacity, saw dust, soil compost blend, beef manure, and turkey litter showed the highest thermal conductivity (K) and volumetric heat capacity (C) (K: 0.12-0.81 W/m °C and C: 1.36-4.08 MJ/m 3°C ). Silage showed medium values at the same water content (K: 0.09-0.47 W/m °C andC: 0.93-3.09 MJ/m 3°C ). Wheat straw, oat straw, soybean straw, cornstalks, alfalfa hay, and wood shavings produced the lowest K and C values (K: 0.03-0.30 W/m °C and C: 0.26-3.45 MJ/m 3°C ). Thermal conductivity and volumetric heat capacity showed a linear relationship with moisture content and bulk density, while thermal diffusivity showed a nonlinear relationship. Since the water, air, and solid materials have their own specific thermal property values, thermal properties of compost bulking materials vary with the rate of those three components by changing water content, bulk density, and particle size. The degree of saturation was used to represent the interaction between volumes of water, air, and solids under the various combinations of moisture content, bulk density, and particle size. The first order regression models developed in this paper represent the relationship between degree of saturation and volumetric heat capacity (r = 0.95-0.99) and thermal conductivity (r = 0.84-0.99) well. Improved knowledge of the thermal properties of compost bulking materials can contribute to improved thermodynamic modeling and heat management of composting processes. KeywordsThermal properties, Compost bulking materials, Thermal conductivity, Thermal diffusivity, Volumetric heat capacity RightsWorks produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted. b s t r a c tThermal properties of compost bulking materials affect temperature and biodegradation during the composting process. Well determined thermal properties of compost feedstocks will therefore contribute to practical thermodynamic approaches. Thermal conductivity, thermal diffusivity, and volumetric heat capacity of 12 compost bulking materials were determined in this study. Thermal properties were determined at varying bulk densities (1, 1.3, 1.7, 2.5, and 5 times uncompacted bulk density), particle sizes (ground and bulk), and water contents (0, 20, 50, 80% of water holding capacity and saturated condition). For the water con...

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Determination of thermal properties of composting bulking materials

Ahn

Sauer²,

Richard

et al. 2009

Bioresource Technology

102

View full text Add to dashboard Cite

show abstract

“…T e -equilibrium temperature of sample and water mixture (K) T s -initial temperature of sample (K) R΄ -rate of temperature fall after equilibrium (K/s) t΄ -time taken for the sample to come to equilibrium (s) (Dutta et al 1988b) The terms t΄ and R΄ accounted for the heat of hydration and heat exchange with the surrounding. At each moisture level employed, four initial temperatures of the samples were used to investigate the effect of temperature on the specific heat.…”

Section: Methodsmentioning

confidence: 99%

“…Dutta et al (1988a) and Aviara et al (1999) used a specially constructed box with removable front panel to determine the angle of repose of gram and guna seeds. The commonly used method of determining the specific heat of agricultural products was the method of mixtures (Dutta et al 1988b;Yang et al 2002). Most of the investigations show that the physical properties of agricultural products are moisture dependent.…”

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confidence: 99%

Effect of moisture content on some engineering properties of mahogany (Khaya senegalensis) seed and kernel

Aviara¹,

Lawal²,

Mshelia³

et al. 2014

Res. Agric. Eng.

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Aviara N.A., Lawal A.A., Mshelia H.M., Musa D., 2014. Effect of moisture content on some engineering properties of mahogany (Khaya senegalensis) seed and kernel. Res. Agr. Eng., 60: 30-36.Some engineering properties of mahogany seed and kernel were investigated and expressed as a function of moisture content. In the moisture ranges of 7.1-32% and 5.3-22% (d.b.), respectively, the seed and kernel length, width and thickness increased with increase in moisture content. One thousand seed and kernel weight increased linearly with moisture content. True density, bulk density, porosity and angle of repose of seed and kernel also increased with increase in moisture content. Static and kinetic coefficients of friction increased linearly with moisture content and varied with structural surfaces. Specific heat increased with increase in both moisture content and temperature. Regression equations were used to express the relationships existing between the engineering properties and seed and kernel moisture contents.

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“…The thermal conductivity of spring wheat was measured by Chandra and Muir [12] in the moisture range of 4.4-25.5% and the temperature range of -6 to 20°C. The thermal conductivity of the gram increased from 0.144 to 0.247 W/m°C with moisture and temperature increase in the ranges of 11.5-27.2% and 10-25°C, respectively [13] . The thermal conductivity of mushrooms was determined in the range of 0.2084-0.5309 W/m°C [14] .…”

Section: Introductionmentioning

confidence: 95%

Specific Heat and Thermal Conductivity of Berberis Fruit (Berberis vulgaris)

Aghbashlo¹,

Kianmehr²,

Hassan-Beygi³

2008

American J. of Agricultural and Biological Sciences

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Abstract:Berberis fruit was known as a medicinal and ornamental plant in the world. It is used in medicine to cure the liver, neck and stomach cancer, blood purification and mouth scent. In order to design of equipments and facilities for the drying, preservation and processing of berberis, it is necessary to know about the specific heat and thermal conductivity. Therefore, the objectives of this study were to determine the specific heat and thermal conductivity of berberis as well as to develop mathematical models for estimation of them. The method of mixtures and hot wire as a heating source was used for measuring the specific heat and thermal conductivity of berberis fruit, respectively. The selected variables to simulate variations of berberis thermal properties were moisture content and temperature. The measurements were done at 50, 60 and 70ºC temperature levels and 19.3%, 38.5%, 55.4% and 74.3% (w.b) moisture content levels. The results show that the specific heat and thermal conductivity of berberis increased linearly from 1.9653 to 3.2811 kJ/kgºC and 0.1324 to 0.4898 W/m°C, respectively with increase in the experimental range of the variables. However, the effect of moisture content on increasing the specific heat and thermal conductivity is more than that of temperature. Regression equations were established which could be used to reasonably estimate the values of the specific heat and thermal conductivity as a function of specified moisture content and temperature.

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Thermal properties of gram

Cited by 52 publications

References 5 publications

Determination of thermal properties of composting bulking materials

Determination of thermal properties of composting bulking materials

Effect of moisture content on some engineering properties of mahogany (Khaya senegalensis) seed and kernel

Specific Heat and Thermal Conductivity of Berberis Fruit (Berberis vulgaris)

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