JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2014, Vol. 44 ›› Issue (5): 88-94.doi: 10.6040/j.issn.1672-3961.0.2014.004

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The effects of weak magnetic field on supercooling process of deionized water and sucrose solution

LI Wenbo, ZHAO Hongxia, HAN Jitian, LAI Yanhua   

  1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
  • Received:2014-01-06 Revised:2014-06-26 Published:2014-01-06

Abstract: In order to study changing laws of supercooling degree and supercooling time of solution under different magnetic field intensity, supercooling processes of deionized water and sucrose solution under a week direct current magnetic field were investigated. The sucrose solution was chosen with four different concentrations (ω1=2%、ω2=5%、ω3=8%、ω4=10%). Experiments were performed to see how the supercooling degree and supercooling time of deionized water and sucrose solution changed at different magnetic field intensities. The magnetic field was generated by a pair of Helmholtz coils and evenly distributed. The coils were connected to a direct current electric source, which regulated the intensities of the magnetic field by varying the direct current output. Both temperature and time was recorded during cooling and freezing processes.The results showed that magnetic field could increase the supercooling degree and supercooling time of deionized water, but the influence on the supercooling process of sucrose solution with different concentration presented a multi-extreme phenomenon. Research results could provide a reference for controlling freeze drying process of solution by applying magnetic field.

Key words: direct current magnetic field, supercooling degree, deionized water, sucrose solution, supercooling time

CLC Number: 

  • TB61
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