Open Access

ARTICLE

MATHEMATICAL MODEL OF THIN LAYER DRYING OF GANODERMA LUCIDUM BY RADIO FREQUENCY ASSISTED HEAT PUMP DRYING

Le Anh Duc^a , Nguyen Hay^a, Pham Van Kien^b,*

a Nong Lam University, Ho Chi Minh City, 700000, Vietnam
b Faculty of Automotive Engineering, School of Engineering and Technology, Van Lang University, Ho Chi Minh City, 700000, Vietnam
* Corresponding author. Email: kien.pv@vlu.edu.vn

Frontiers in Heat and Mass Transfer 2022, 18, 1-7. https://doi.org/10.5098/hmt.18.44

Abstract

This study determined the most appropriate thin layer drying model, the effective moisture diffusivity and the activation energy of moisture within Ganoderma lucidum in radio frequency (RF) assisted heat pump drying method. The thin layer drying experiments were conducted with input drying parameters such as: drying temperature of 40, 45 and 50°C and RF power of 0.65, 1.3 and 1.95 kW. In order to select a suitable form of drying curve, seven different thin layer drying models (Lewis, Page, Modified Page, Henderson and Pabis, Verma, Midilli, and Wang and Singh) were fitted to the experimental data. The Verma model was the most adequate model for describing the thin layer drying of Ganoderma lucidum. The average effective moisture diffusivity values varied from 2.34×10^-9 to 3.54×10^-9 m² /s. The activation energy values varied from 18.27 to 19.61 kJ/mol over the proposed range of drying temperature and RF power.

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Keywords

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