Experimental Investigation of Drying Behavior of Rosehip in a Cyclone-Type Dryer

This paper describes an experimental investigation of the drying behavior and conditions of rosehip in a convective cyclone-type dryer. Drying experiments were conducted at air inlet temperatures of 50, 60 and 70 o C and air velocities of 0.5, 1 and 1.5 ms–1. The parametric values obtained from the experiments were fitted to the Newton mathematical models. Consequently, the drying model developed by Newton model showed good agreement with the data obtained from the experiments. Concluding, it was obtained that; (i) the temperature is the major effect on the drying process, (ii) air velocity has low effect on the drying of rosehip, (iii) the C-vitamin is observed to change according to the temperature, moisture, drying time and flow types. The changing ratio is found to be in the range of 0.70-0.74.

Authors:

• Ayse Bicer
• Filiz Kar

Keywords:

• Rosehip
• drying
• food quality.

References:

[1] E.K.Akpinar, The development of a cyclone type dryer for agricultural
products, Ph D thesis, Firat University, Elazig Turkey, 2002.
[2] K.,Buvanasundaram, N., Mukai, T., Tsukada, M., Hozawa, M.,
Experimental and theoretical studies on drying of food materials.
Journal of Chemical Engineering of Japan, 29, 1. 1996.
[3] S., Erent├╝rk, M..,S.,Gulapoglu, S..,G├╝ltekin, Experimental
determination of effective moisture diffusivities of whole and cut
rosehips in convective drying, Food and Bioproducts processing,
88, 99-104, 2010.
[4] L.,Stralsjo, C., Alklint, M.E.,Olsson. and I.,Sjoholm, Total foliate
content and retention in rosehip after drying, Journal of Agricultural
food Chemistry, 51, 4291-4295,2003
[5] F.,Demir, M., Ozcan, Chemical and technological properties of rose
(Rosa canina L.) fruits grown wild in Turkey". Journal of Food
Engineering, 47, 333-336, 2001.
[6] S., Erent├╝rk, M..,S.,Gulapoglu, S..,G├╝ltekin,The thin-layer drying
characteristics of rosehip. Biosystems Engineering, 89, 159-166, 2004.
[7] Sarsavadia, Sawhney, Pangavhane and Sing, Drying behavior of brined
onion slices. Journal of Food Engineering, 40, 219-226, 1999.
[8] Yald─▒z, Ertekin and Uzun, Thin layer solar drying of some vegetables,
Drying Technology, 19, 583- 596, 2001
[9] A., Midilli, Determination of pistachio drying behavior and condition
in a solar drying system. International Journal of Energy Research,
25, 715- 725, 2001
[10] url: http://en.wikipedia.org/wiki/Rose_hip (date: 09 February 2011)
[11] S., Erent├╝rk, M..,S.,Gulapoglu, S..,G├╝ltekin, The effects of cutting and
drying medium on the vitamin C content of rosehip during drying,
Journal of Food Engineering, 68, 513-518, 2005.