Full Content is available to subscribers

Subscribe/Learn More  >

Effect of Biological Macro-Molecular Flow on the Hot Air Drying of Astragalus Slices

[+] Author Affiliations
Junhong Yang, Qianqian Di, Jun Zhao

Tianjin University, Tianjin, China

Liqiu Wang

The University of Hong Kong, Hong Kong, China

Paper No. HT2009-88385, pp. 265-272; 8 pages
  • ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences
  • Volume 2: Theory and Fundamental Research; Aerospace Heat Transfer; Gas Turbine Heat Transfer; Computational Heat Transfer
  • San Francisco, California, USA, July 19–23, 2009
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-4357-4 | eISBN: 978-0-7918-3851-8
  • Copyright © 2009 by ASME


Astragalus slice is one species of stem and root medicinal herb with the widely curative effects, also a special and typical plant porous material, and the drying operation is one of important processing technologies in its storage and further practical application. By using scanning electronic microscope (SEM), we mainly characterize the micrographics of parenchyma cell, trachea and aperture of Astragalus slices dried by hot air at 60°C, with the aim to discuss the relationships among the microstructure of sample, macro-drying property and drying mechanism in micro-scale. Results show that in hot air dried sample, the distribution status of cytoplasm inside parenchyma cells appears obvious different with that of untreated sample, behaving agglomeration and leaving wide space with cell wall. Furthermore, we find that in comparison with the untreated sample, the shape of aperture in hot air dried sample basically maintains un-changed, but most of apertures are fully filled with some perceived substance. It is demonstrated that the flow phenomenon of cytoplasm occurs inside matrix accompanied by the moisture diffusion in the mode of liquid water, particularly biological macro-molecular, which directly influence the permeability of moisture transfer path inside matrix and the quality of dried products. Hence, this study has significant meanings to develop the optimized drying technology of plant porous material focused on micro-mechanism and the quality of dried products.

Copyright © 2009 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In