Temperature Variation of a Double-pass Solar Drying System with Porous Media

A solar air drying system including solar air collector, drying cabinet and air blower for notoginseng drying has been constructed and tested. Two identical air solar collectors with two air channels, V-groove absorption heat plates and a single glass cover have been employed. The results of test show that the solar air collectors can obtain a good thermal performance in winter season. When the air flow mass rate is fixed at 0.0597kg·s-1, the maximum values of thermal efficiency and outlet air temperature are 76.0% and 62.2°C, respectively. The experimental analysis between two sampling notoginseng drying suggests that the solar drying is very effective, and the drying time has been shorten to about 440 minutes from 990 minutes of the traditional drying by sun. It is also observed that using the solar drying system notoginseng has a higher quality than traditional drying method.

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Energy Analysis of the Direct and Indirect Solar Drying System

Solar Drying Technology - Green Energy and Technology ◽

10.1007/978-981-10-3833-4_19 ◽

2017 ◽

pp. 529-542

Author(s):

Om Prakash ◽

Anil Kumar ◽

Prashant Singh Chauhan ◽

Daniel I. Onwude

Keyword(s):

Energy Analysis ◽

Solar Drying ◽

Drying System

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Temperature Variation in Breast Tissue Model With and Without Tumor Based on Porous Media

Journal of Nepal Mathematical Society ◽

10.3126/jnms.v4i1.37116 ◽

2021 ◽

Vol 4 (1) ◽

pp. 61-75

Author(s):

Sharmila Shrestha ◽

Gokul K.C. ◽

Dil Bahadur Gurung

Keyword(s):

Porous Media ◽

Temperature Variation ◽

Breast Tissue ◽

Normal Breast Tissue ◽

Anterior Part ◽

Skin Surface ◽

Normal Breast ◽

The Finite Element Method ◽

Porous Media Model ◽

Tumor Region

The human body is made by 200 different types of cells, which are separated by voids. Blood supplies the nutrients and minerals to all cells within the tissue through these voids. The breast tissue is treated as a porous media in the study. Tumor includes the vascular (blood) and the extra-vascular (solid) regions. The porosity of a tumor is higher than normal tissue. The present work deals with the temperature variation of normal and tumorous breast tissue based on porous media. The finite element method is used to solve the two-dimensional bio-heat equation. The results show that the temperature profile of normal breast tissue in the porous media model is almost identical with the conventional bio-heat model at correction factor is equal to 0:6. The temperature of tumor region in the porous media model is slightly lower than the conventional bio-heat model. When the porosity is increased, the temperature of normal breast tissue is increased. But in tumorous breast tissue, the temperature is slightly increased in skin surface to anterior part of the tumor and slightly decreased in tumor region. The temperature of normal and tumorous breast tissue is increased when metabolism, blood velocity, and room temperature are increased in the porous media model. The central temperature of the tumor region reaches a steady state faster than anterior and posterior temperature of both normal and tumorous breast tissue in conventional bio-heat model and porous media model.

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