Experimental investigation of drying Thymus cut leaves in indirect solar dryer with PCM

[+] Author and Article Information
A. A. El-Sebaii

Department of Physics, Faculty of Science, Tanta University, Tanta 31111, Egypt

S. M. Shalaby

Department of Engineering Physics and Mathematics, Faculty of Engineering, Tanta University, Tanta 31111, Egypt

1Corresponding author.

ASME doi:10.1115/1.4037816 History: Received April 27, 2017; Revised August 28, 2017


In this work, the indirect solar drier (IDSD) is used for drying Thymus by using four techniques. Firstly the whole leaves of Thymus are dried using the IDSD without using phase change material (PCM). The obtained results of this experiment shows that the moisture content of Thymus leaves decreases slowly in the first three days which is considered abnormal behavior compared with most studied dried plants in the literature. In order to reduce the drying time, the whole and cut leaves of Thymus are dried simultaneously in the IDSD without using the PCM. The results indicated that cutting Thymus leaves reduces the drying time by 55.6 %. To increase the operating time of the IDSD and control the drying temperature as well, the IDSD is integrated with paraffin wax as a PCM. This reduces the drying time of cut leaves by 50% compared with the system without using the PCM. Moreover, eleven mathematical models are tested in order to select the best one describing the drying behavior of whole and cut leaves in the IDSD without and with using the PCM. As result of the abnormal behavior of drying Thymus, most of the examined mathematical models failed to describe the drying behavior of Thymus satisfactory. Therefore, a new mathematical model (four parameter logistic model) is introduced aimed to well describe the drying behavior of Thymus.

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