It is the cache of http://wjst.wu.ac.th/index.php/wjst/article/view/61. It is a snapshot of the page. The current page could have changed in the meantime.
Tip: To quickly find your search term on this page, press Ctrl+F or ⌘-F (Mac) and use the find bar.

Drying Kinetics of Steamed Glutinous Rice with a Free Convective Solar Dryer | LIMPAIBOON | Walailak Journal of Science and Technology (WJST)

Drying Kinetics of Steamed Glutinous Rice with a Free Convective Solar Dryer

Kongdej LIMPAIBOON, Songchai WIRIYAUMPAIWONG

Abstract


The drying kinetics of steamed glutinous rice with a free convective solar dryer was studied and compared with open sun drying. The color of the dried product was also evaluated. The drying behavior of the steamed glutinous rice formed in the short cylindrical shape, known as Kao-Tan, from 100 % dry basis to a constant moisture level was investigated. Several drying models, namely Newton, Page, Henderson & Pabis and the Two term exponential were fitted to the data for both drying methods. The experimental results showed that solar dryer provided a higher air temperature and higher drying rate than open sun drying. The drying rate depended on the air temperature. The color comparison of the dried products between the 2 drying methods revealed that the solar dryer led to a significantly lighter, less red and less yellow product than that dried by open sun drying. From this study it can be concluded that a free convective solar dryer can be used to produce dried steamed glutinous rice well. Finally, the best drying model was Henderson & Pabis, whose model parameters was functioned with drying air temperature.


Keywords


Color, drying kinetics, steamed glutinous rice, solar dryer, models

References


A Ayensu. Dehydration of food crops using a solar dryer with convective heat flow. Sol. Energy 1997; 59, 121-6.

S Lahsasni, M Kouhila, M Mahrouz and JT Jaouhari. Drying kinetics of prickly pear fruit (Opuntia ficus indica). J. Food Eng. 2004; 61, 173-9.

E Kavak Akpinar and Y Bicer. Mathematical modelling of thin layer drying process of long green pepper in solar dryer and under solar. Energ. Convers. Manage. 2008; 49, 1367-75.

PC Pande. Performance of PV Winnower Cum Dryer for Processing of Agricultural Products. In: Proceedings of the International Solar Food Processing Conference 2009, Indore, India. 2009.

P Gbaha, H Yobouet Andoh, J Kouassi Saraka, B Kaménan Koua and S Touré. Experimental investigation of a solar dryer with natural convective heat flow. Renew. Energ. 2007; 32, 1818-29.

S Sing, P Pal Singh and SS Dhaliwal. Multi-shelf portable solar dryer. Renew. Energ. 2004; 29, 753-65.

MA Karim and MNA Hawlader. Development of solar air collectors for drying applications. Energ. Convers. Manage. 2004; 45, 329-44.


Full Text: PDF

Refbacks

  • There are currently no refbacks.


http://wjst.wu.ac.th/public/site/images/admin/image012_400

Print ISSN: 1686-3933

Online ISSN: 2228-835X

http://wjst.wu.ac.th

Last updated: 5 March 2014