Equilibrium heat and moisture transfer in air flow through grain

Sutherland, J.W.; Banks, P.J.; Griffiths, Huw

doi:10.1016/s0021-8634(71)80036-7

Cited by 67 publications

(10 citation statements)

References 12 publications

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“…and a, b, c, and d are the equation parameters. The intercept K of equation (2) can be expressed as a function of equilibrium moisture content in the form suggested by Sutherland et al [20] as follows:…”

Section: Haque Et Almentioning

confidence: 99%

“…Hossain et al [17] found isosteric heat to be a power function of equilibrium moisture content for pineapple. Although an equation for isosteric heat of wheat grain and some common seeds together with the parameters has been reported, [20,21] negligible information is available on the isosteric heat of hybrid rice kernels. Therefore, this study was carried out to estimate this important thermodynamic property together with the parameters for different forms of hybrid rice kernels.…”

Section: Introductionmentioning

confidence: 99%

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Net Isosteric Heats of Adsorption and Desorption for Different Forms of Hybrid Rice

Haque

Shimizu

Kojima

et al. 2007

International Journal of Food Properties

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Hygroscopy of hybrid rice affects storage, handling, and processing. The thermodynamic relationship upon which the estimate of isosteric heat is based is the Clausius-Clayperon equation. The net isosteric heat of sorption was determined from the slope of the ln(rh) versus 1/T lines at a constant moisture content. Net isosteric heat of desorption was found higher than that for the adsorption within a moisture content range of 12-20% for all of the rice kernels. The net isosteric heats of desorption and adsorption were higher for hybrid rough rice kernels followed by brown rice and milled rice kernels, respectively. An empirical equation was fitted to describe the net isosteric heats of hybrid rice kernels as a function of moisture content and was found adequate to predict the net isosteric heats. The intercept K was also found to be a function of moisture content and the model predicted the K value well (r 2 = 0.85 for adsorption and r 2 = 0.92 for desorption). This set of two equations would be useful in the simulation of hybrid rice during storage.

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Section: Haque Et Almentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Net Isosteric Heats of Adsorption and Desorption for Different Forms of Hybrid Rice

Haque

Shimizu

Kojima

et al. 2007

International Journal of Food Properties

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“…Since, at saturation conditions, the dryand wet-bulb temperatures are the same, the obtained temperature was also the value of wet-bulb temperature at interstitial air within the grain bulk (CWBT). For a given intergranular air dry-bulb temperature (T) and absolute humidity (w), the constant enthalpy (I aconst ) line was (Sutherland, Banks, & Griffiths, 1971):…”

Section: Commodity Wet-bulb Temperature Calculation Proceduresmentioning

confidence: 99%

A mathematical model of commodity wet-bulb temperature (CWBT) for grain storage applications

Ranjbaran

Emadi

2015

Biosystems Engineering

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“…The input data for the numerical solution of the model are based on physical properties typical of stored grains and they are Cf = 1.0048 kJ/kgK, C, = 1.117 kJ/kgK, C, = 1.3 kJ/kgK. C, = 4.187 kJ/kgK (Sutherland et al 1971), Defr = 0.6175 X m2/s (Thorpe et ul. 1991a,b), ah,/dT' = -2.3768 kJ/kgK (derived from data presented by Keenan and Keyes 1936), H = 5.0 m, K = 2.5159 X m2 (derived from Hunter 1983), L = 20.0 m, qH = 15778 kJ/kg (Thompson 1972), qw = 0.6, AT' = lOC, fi = 1/293.15, Keff = 1.64 X kW/mK (Chung and Lee 1986), pf = 1.2 kg/m3, ps = 690.0 kg/m3 (Sutherland et ul.…”

Section: Numerical Solutionmentioning

confidence: 99%

A GRID GENERATION TECHNIQUE FOR NUMERICAL MODELLING HEAT and MOISTURE MOVEMENT IN PEAKED BULKS of GRAIN

Singh

Thorpe

1993

J Food Process Engineering

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This paper describes a numerical solution procedure to study heat and moisture transfer processes by two‐dimensional natural convection phenomena in grain stores with arbitrary geometries. This enables grain storage technologists to investigate the design and performance of grain stores in which the grain surface is peaked, as in bunker storage, for example. Momentum transfer is described by an elliptic partial differential equation, which governs the behavior of the stream function. Using an algebraic grid generation technique, the governing equations are transformed into a body‐fitted rectangular coordinate system that allows coincidence of all boundary lines with a coordinate line. Numerical solutions of the resulting equations are obtained using an alternating direction implicit method. Results from numerical experiments on a peaked bulk of stored grain retained between two vertical walls are obtained that show the magnitude and directions of convection currents and contours of temperature, moisture, dry matter loss and chemical pesticide concentrations.

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Equilibrium heat and moisture transfer in air flow through grain

Cited by 67 publications

References 12 publications

Net Isosteric Heats of Adsorption and Desorption for Different Forms of Hybrid Rice

Net Isosteric Heats of Adsorption and Desorption for Different Forms of Hybrid Rice

A mathematical model of commodity wet-bulb temperature (CWBT) for grain storage applications

A GRID GENERATION TECHNIQUE FOR NUMERICAL MODELLING HEAT and MOISTURE MOVEMENT IN PEAKED BULKS of GRAIN

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