Experimental analysis and modeling of ultrasound assisted freezing of potato spheres

Ultrasonics Sonochemistry
Hossein KianiDa-Wen Sun

Abstract

In recent years, innovative methods such as ultrasound assisted freezing have been developed in order to improve the freezing process. During freezing of foods, accurate prediction of the temperature distribution, phase ratios, and process time is very important. In the present study, ultrasound assisted immersion freezing process (in 1:1 ethylene glycol-water solution at 253.15K) of potato spheres (0.02 m diameter) was evaluated using experimental, numerical and analytical approaches. Ultrasound (25 kHz, 890 W m(-2)) was irradiated for different duty cycles (DCs=0-100%). A finite volume based enthalpy method was used in the numerical model, based on which temperature and liquid fraction profiles were simulated by a program developed using OpenFOAM® CFD software. An analytical technique was also employed to calculate freezing times. The results showed that ultrasound irradiation could decrease the characteristic freezing time of potatoes. Since ultrasound irradiation increased the heat transfer coefficient but simultaneously generated heat at the surface of the samples, an optimum DC was needed for the shortest freezing time which occurred in the range of 30-70% DC. DCs higher than 70% increased the freezing time. DCs lower tha...Continue Reading

References

Feb 28, 2002·The Journal of the Acoustical Society of America·Byoung-Gook LohClement Kleinstreuer

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Citations

Feb 9, 2016·Critical Reviews in Food Science and Nutrition·Xiao-Fei WuJincai Sun
Jun 1, 2018·Critical Reviews in Food Science and Nutrition·Peizhi ZhangDa-Wen Sun

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