Open sun drying of Tinospora cordifolia, Curcuma longa L. and Zingiber officinale. Thermal analysis.

摘要

Slices of the herb, giloe (Tinospora cordifolia), and the spices, ginger (Zingiber officinale) and turmeric (Curcuma longa L.), were dried on trays in the sun, and product temperature, temperature around the product surface, relative humidity and moisture transfer were monitored. The convective heat transfer coefficient and its dependence on temperature and drying time were determined. Results from mathematical modelling of thermal behaviour agreed well with experimental values.