Effect of microwave power, air velocity and temperature on the final drying of osmotically dehydrated bananas
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Effect of microwave power, air velocity and temperature on the final drying of osmotically dehydrated bananas. / Pereira, Nádia R.; Marsaioli, Antonio; Ahrné, Lília M.
I: Journal of Food Engineering, Bind 81, Nr. 1, 2007, s. 79-87.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Effect of microwave power, air velocity and temperature on the final drying of osmotically dehydrated bananas
AU - Pereira, Nádia R.
AU - Marsaioli, Antonio
AU - Ahrné, Lília M.
PY - 2007
Y1 - 2007
N2 - This paper reports on a study of the final stage of microwave-hot air drying of osmotically dehydrated bananas, focusing on the effects of microwave power, air temperature and air velocity on drying kinetics and product quality, evaluated in terms of colour, apparent volume and porosity. The drying process was divided into three periods: phase I (760 W; 2 kgmoisture/kgdry matter); phase II (380 W; 0.67 kgmoisture/kgdry matter); and phase III (0 W, 76 W, 150 W or 230 W up to the final sample moisture of 0.17 kgwater/kgd m). Three conditions for the hot air were tested: 50 °C and 3.3 m/s; 70 °C and 3.3 m/s; 70 °C and 5.7 m/s. The results show that increasing the microwave power in phase III increased the drying rate, thus making the drying time shorter. However, higher microwave power also caused temperature runaway leading to charring on the dried product. Air flow cools the product surface and improves product quality by reducing charring.
AB - This paper reports on a study of the final stage of microwave-hot air drying of osmotically dehydrated bananas, focusing on the effects of microwave power, air temperature and air velocity on drying kinetics and product quality, evaluated in terms of colour, apparent volume and porosity. The drying process was divided into three periods: phase I (760 W; 2 kgmoisture/kgdry matter); phase II (380 W; 0.67 kgmoisture/kgdry matter); and phase III (0 W, 76 W, 150 W or 230 W up to the final sample moisture of 0.17 kgwater/kgd m). Three conditions for the hot air were tested: 50 °C and 3.3 m/s; 70 °C and 3.3 m/s; 70 °C and 5.7 m/s. The results show that increasing the microwave power in phase III increased the drying rate, thus making the drying time shorter. However, higher microwave power also caused temperature runaway leading to charring on the dried product. Air flow cools the product surface and improves product quality by reducing charring.
KW - Fruits
KW - Microwave final drying
KW - Porosity
KW - Product quality
U2 - 10.1016/j.jfoodeng.2006.09.025
DO - 10.1016/j.jfoodeng.2006.09.025
M3 - Journal article
AN - SCOPUS:33846612021
VL - 81
SP - 79
EP - 87
JO - Journal of Food Engineering
JF - Journal of Food Engineering
SN - 0260-8774
IS - 1
ER -
ID: 202134431