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Coupled airflow, heat, and moisture transport in static magnetic field assisted pork precooling based on multiphysics
Zeyu Xu1, Pengyu Zhou2, Xiao Gu2
1College of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou, 450000, China; Henan Dayong Industrial Co., Ltd., Hebi, 456750, China; Key Laboratory of Cold Chain Food Processing and Safety Control (Zhengzhou University of Light Industry), Ministry of Education, Zhengzhou, 450000, China; Henan Qiaoyou Machinery Technology Co., Ltd., Luohe, 462000, China.
Abstract:
Static magnetic field (SMF) assisted precooling may improve pork water retention, but its coupled thermal and moisture transfer remains unclear. A multiphysics model coupling airflow, heat transfer, moisture transport, and an empirical SMF dependent correction to liquid water mobility was developed for pork longissimus dorsi. Under 2.5 mT SMF and 95% relative humidity, the predicted time for center temperature to decrease from 25 to 2 °C was 42.50 min, compared with 43.55 ± 2.26 min experimentally, the relative deviation was 2.41%. Core temperature differences between magnetic and non-magnetic conditions remained below 0.5 °C. Drip loss decreased by 45.65%, and the model predicted a 43.60% reduction in total net moisture transfer rate magnitude at 42.50 min. Relative humidity mainly affected surface evaporation, the SMF term reduced internal water mobility. These results indicate that the combined precooling method can effectively enhance the water retention capacity during the pork cooling process.
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