화학공학소재연구정보센터
Journal of Food Engineering, Vol.165, 156-165, 2015
Thermal conductivity, specific heat, thermal diffusivity, and emissivity of stored canola seeds with their temperature and moisture content
Density (rho), specific heat (c(p)), thermal conductivity (k), diffusivity (alpha), and emissivity (epsilon) of canola seeds (Brassica napus L.) are important engineering parameters in the design of storage, heating, and cooling systems. The properties were determined at moisture content (MC) ranging from 5% to 11% (M/M) wet basis (w.b.) and temperature from 40 to 90 degrees C. Bulk (rho(b)) and particle (rho(p)) densities of stored canola seeds decreased with temperature and ranged from 654.0 to 664.8 kg m(-3) and 1047 to 1131 kg m(-3), respectively. The c(p) of stored canola seeds increased with temperature and MC, and ranged from 2180 to 3498 J kg(-1) degrees C-1. The k of stored canola seeds at rho(b) and rho(p) increased with temperature and MC and ranged from 0.06 to 0.13 W m(-1).degrees C-1 and 0.15 to 0.25 W m(-1) degrees C-1, respectively. The a of stored canola seeds at rho(b) and rho(p) were calculated from the measured k, c(p), and rho, and ranged from 0.40 x 10(-8) to 5.7 x 10(-8) m(2)s(-1), and 6.1 x 10(-8) to 8.0 x 10(-8) m(2) s(-1). The alpha of stored canola seeds at rho(b) increased with temperature and MC. The alpha of stored canola seeds at rho(p) exhibited descending-ascending trends with increasing MC at different temperatures except 40 degrees C. The epsilon of stored canola seeds decreased with MC and temperature and ranged from 0.93 to 0.99. Based on the experimental data, regression models for all the properties were developed. (C) 2015 Elsevier Ltd. All rights reserved.