PH—Postharvest Technology: Determination of Thermal Conductivity, Specific Heat and Thermal Diffusivity of Borage Seeds
✍ Scribed by W. Yang; S. Sokhansanj; J. Tang; P. Winter
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 247 KB
- Volume
- 82
- Category
- Article
- ISSN
- 1537-5110
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✦ Synopsis
Thermal conductivity, specific heat capacity and thermal diffusivity of borage (Borago officinalis) seeds were determined at temperatures ranging from 6 to 208C and moisture contents from 1Á2 to 30Á3% w.b. The thermal conductivity was measured by the transient technique using a line heat source. The maximum slope method was used to analyse the line source heating data for thermal conductivity determination. The specific heat capacity was measured by different scanning calorimetry and ranged from 0Á77 to 1Á99 kJ kg À1 K À1 . The thermal conductivity of borage seeds ranged from 0Á11 to 0Á28 W m À1 K À1 and increased with moisture content in the range of 1Á2-30Á3% w.b. The thermal diffusivity ranged from 2Á32 Â 10 À7 to 3Á18 Â 10 À7 m 2 s À1 . Bulk density of borage seeds followed a parabolic relationship with moisture content. Uncertainty analysis revealed that variation in the thermal conductivity contributed mostly to the accuracy of the thermal diffusivity.