BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI

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124 Petru Cârlescu et al a b Fig. 3 – Temperature evolution in the first layer of malt: a – time 120 s; b – time 25080 s. a b Fig. 4 – Temperature evolution in the last layer of malt: a – time 120 s; b – time 25080 s. a Fig. 5 – Temperature evolution in the dryer cross section: a – time 120 s; b – time 25080 s. 4. Conclusions 1. A mathematical model was developed based on dynamic heat transfer in a bed of malt, and based on this model was simulated in FLUENT software temperature distribution in this bed with a certain degree of porosity. b
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 3, 2012 125 2. Modeling and simulation the malt bed as a porous medium raises a number of problems in terms of heat flow (hot air) through it, the more so as malt drying involves both heat transfer and mass transfer. 3. The complexity of the mathematical model is high and the CFD simulation was not possible, or would have taken more time without the support graphics station of high performance. 4. The temperature profile in malt bed resulting from the CFD simulation are presented with a high degree of accuracy since the previous simulations were performed its calibration data obtained from experiment. The input air temperature in the dryer were obtained experimental and functions by temperature and time are considered as initial date in simulation. Both experimental and simulation were unstady preformed on a 3D geometry dryer. 5. Temperature distribution in the bed malt is very useful in futher development of the mathematical model by introducing mass transfer depends on the time evolution of temperature. 6. The stand designed for drying allows large variations of temperature and humidity of hot air inlet, fitted with sensors for temperature and humidity as well as air parameters variation. 7. The proposed model and CFD simulation can be used for drying other grains. REFERENCES Andrade E.T., Simulacao da variacao de temperatura em milho armazenado em silo metalico. Minas Gerais: Imprensa Universitaria, Universidade Federal de Vicosa, Tese de doutorado em Engenharia Agricola, 2001, pp. 174-178. Chang C. S., Converse H. H., Steele J. L., Modeling of Temperature of Grain During Storage with Aeration. Trans. Am. Soc. Agric. Engrs., 36, 2, 509-519 (1993). Chang C. S., Converse H. H., Steele J. L., Modeling of Moisture Content of Grain During Storage with Aeration. Trans. Am. Soc. Agric. Engrs., 37, 6, 1891-1898 (1994). Chung, D.S., Pfost, H.B., Adsorption and Desorption of Water Vapor by Cereal Grains and their Products. (I) Heat and Free Energy Changes of Adsorption and Desorption. Transactions of the American Society of Agricultural Engineers, 10, 549-555 (1967). Devilla I.A., Simulacao de deterioracao de distribuicao de temperatura umidade em uma massa de graos armazenados em silos com aeracao. Minas Gerais: Imprensa Universitaria, Universidade Federal de Vicosa, Tese de doutorado em Engenharia Agricola, 2002, pp. 84-90. Hunter, A.J., An Isostere Equation for Some Common Seeds. Journal of Agricultural Engineering Research, 37, 93-107 (1987). Hunter, A.J., On the Heat of Sorption of Paddy Rice. Journal of Agricultural Engineering Research, 44, 237-239 (1989).
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BULETINUL INSTITUTULUI POLITEHNIC D
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