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Determination of Simultaneous Heat and Mass Transfer Parameters of Tulumba Dessert during Deep‐Fat Frying
Author(s) -
Erim Kose Yagmur,
Dogan Ismail Sait
Publication year - 2017
Publication title -
journal of food processing and preservation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.511
H-Index - 48
eISSN - 1745-4549
pISSN - 0145-8892
DOI - 10.1111/jfpp.13082
Subject(s) - thermal diffusivity , mass transfer , dimensionless quantity , thermodynamics , moisture , mass transfer coefficient , mass diffusivity , chemistry , heat transfer coefficient , arrhenius equation , water content , diffusion , heat transfer , analytical chemistry (journal) , activation energy , materials science , chromatography , physics , geotechnical engineering , organic chemistry , engineering
The heat transfer ( h ) of “Tulumba” dough was investigated depending on the water loss during frying at 150–180C. The plots of dimensionless temperature and concentration ratios against time were used to determine heat and mass transfer parameters. The mechanism of moisture transfer was studied. Effective mass transfer coefficient increased linearly, whereas effective moisture diffusivity increased exponentially with rising frying temperature. Moisture diffusivity were 1.77, 2.15, 2.69 and 3.59 × 10 −7 m 2 /s, and mass transfer coefficient were 3.009, 3.225, 3.445 and 3.695 × 10 −6 m/s for 150, 160, 170 and 180C, respectively. An Arrhenius type of relationship was found between temperature and the effective moisture diffusivity, so activation energy was calculated at 36.58 kJ/mol. On the other hand, higher oil temperature decreased the effective heat transfer coefficient during deep‐fat frying. The maximum value was determined 182.41 W/m 2 C at 150C and the minimal value as 125.715 W/m 2 C at 180C. Practical Applications In this study we investigated tulumba dough frying process (heat and mass transfer parameters) by experimental and analytical methods simultaneously. We obtained the parameters for the process design and optimization. This study is a pioneering study on Newman technique for cylinder shape food products. Higher oil temperature was found to be very important for heat transfer coefficient, moisture diffusivity and mass transfer coefficient.