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Información tecnológica

versão On-line ISSN 0718-0764

Resumo

AHUMADA, Luz M; AUDIVET, Cinthia P; BULA, Antonio J  e  SANJUAN, Marco E. Comparison of Numerical Solutions for a Mathematical Model of Theoretical Combustion and Conductivity Variation of Shell Palm in an Fixed Bed Reactor. Inf. tecnol. [online]. 2017, vol.28, n.3, pp.171-184. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642017000300018.

In this investigation numerical solutions for a mathematical model of theoretical combustion and conductivity variation of the shell palm in an downdraft fixed bed reactor were compared by means of combinations between order 2, 4 and 6 of finite difference (FD) compact schemes (CE) and Runge Kutta (RK) integration methods (n = 1,2 and 4). The results obtained showed that the approximation obtained under 4 order CE and the integration method RK(n=4), was the closest with 13.6E-5% to the reference point (order 6 of CE, integrating system RK of order 4, mesh 80x80 and 1 second step time) and between 7.22% and 8.1% significant errors at an approximate height of 0.5m measured from the bottom hopper. In addition, the correlation between the position-temperature and temperature-conductivity variables for 21 x-spaced points distributed over a line from 0≤y≤H is presented. This corroborates the fact that the conductivity of the material increases as the temperature increases and is inversely proportional to the distance measured from the bottom hopper.

Palavras-chave : compact schemes; finite difference; integration methods; biomass; thermal conductivity.

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