Open AccessESTIMATION OF TEA LEAVES MASS TRANSFER PARAMETERS UNDERGOING MICROWAVE HEAT TREATMENT
Author(s) -
Elçin Demırhan,
G. Sert,
S. Harmanli,
Belma Özbek
Publication year - 2018
Publication title -
latin american applied research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.123
H-Index - 23
eISSN - 1851-8796
pISSN - 0327-0793
DOI - 10.52292/j.laar.2018.267
Subject(s) - thermal diffusivity , microwave , arrhenius equation , moisture , mass transfer , materials science , microwave power , microwave oven , water content , analytical chemistry (journal) , exponential function , thermodynamics , activation energy , mathematics , chemistry , chromatography , composite material , physics , computer science , mathematical analysis , telecommunications , geotechnical engineering , organic chemistry , engineering
In the present study, tea leaves (Camellia sinensis) were dried in the domestic microwave oven in order to determine the effect of microwave output power and sample amount on moisture ratio, drying time and effective moisture diffusivity. Five different microwave output power (180-900 W) and five different sample amount (20-100 g) values were used in the drying experiments. The drying data were fitted to some empirical and semi empirical models in order to determine the kinetic parameters. Among of the models proposed, the Page model gave a better fit for all drying conditions applied. The effective moisture diffusivity values were calculated by using the method of slopes at various microwave output powers and sample amounts. Moreover, the activation energy was calculated using an exponential expression based on Arrhenius equation.