Effect of Oscillating Magnetic Field on Freezing Rate, Phase Transition Time and Supercooling of Deionized Water

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Published: Feb 19, 2020
Keywords:
Deionized water Freezing rate Oscillating magnetic field Phase transition time Supercooling

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Pakjira Jarulertwattana
Food Security and Process Innovation Research Group, Food Engineering Department, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
Suwit Siriwattanayotin
Food Security and Process Innovation Research Group, Food Engineering Department, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
Suvaluk Asavasanti
Food Security and Process Innovation Research Group, Food Engineering Department, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand

Abstract

Due to a growing interest toward quality improvement of frozen foods, many advanced technologies have been combined with conventional freezing system to expedite rate of freezing and reduce ice crystal formation. This research aimed to investigate the effect of oscillating magnetic field (OMF) in the range of 0 to 12 mT (50 Hz) on freezing rate, phase transition time and supercooling of deionized water during freezing in an air blast freezer at –10°C. The sample was placed between two magnetic cores where an oscillating magnetic field (OMF) was generated and the temperature profile was recorded by a data logger at 1-minute interval. The magnetic field strength was varied at 0, 4, 8, and 12 mT. It was found that there was no significant difference in the freezing rate and phase transition time when different OMF strengths were applied (p > 0.05). Interestingly, the probability of supercooling occurrence increased when the OMF was applied; without OMF only 16% of the experiment exhibited supercooling phenomenon where 33% was detected when OMF in the range of 4–12 mT was applied. However, the probability of supercooling occurrence was independent of the OMF strength.

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How to Cite
Jarulertwattana, P., Siriwattanayotin, S., & Asavasanti, S. (2020). Effect of Oscillating Magnetic Field on Freezing Rate, Phase Transition Time and Supercooling of Deionized Water. Applied Science and Engineering Progress, 13(1), 32–37. Retrieved from https://ph02.tci-thaijo.org/index.php/ijast/article/view/240004
Issue
Vol. 13 No. 1 (2020)
Section
Research Articles

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