CAJ | 학술논문

为了研究溶液过冷度和过冷时间在磁场作用下的变化规律，研究了弱直流磁场作用下去离子水和蔗糖溶液的过冷现象。采用亥姆霍兹线圈产生匀强磁场，线圈连接到可以改变输出电流值的直流电源上，从而可以控制磁场强度的大小。研究去离子水以及4种不同质量分数的蔗糖溶液（ω1＝2％、ω2＝5％、ω3＝8％、ω4＝10％）在直流磁场作用下的过冷度及过冷态时间的变化，在冷却和冻结过程中记录溶液温度和时间。结果表明：对于去离子水，直流磁场会提高过冷度，过冷时间会有所延长；而对于蔗糖溶液，不同强度的直流磁场对不同质量分数的蔗糖溶液过冷过程的影响呈现多极值现象。该试验结果可以为磁场应用于控制溶液的冷冻干燥过程提供指导。
위료연구용액과랭도화과랭시간재자장작용하적변화규률，연구료약직류자장작용하거리자수화자당용액적과랭현상。채용해모곽자선권산생균강자장，선권련접도가이개변수출전류치적직류전원상，종이가이공제자장강도적대소。연구거리자수이급4충불동질량분수적자당용액（ω1＝2％、ω2＝5％、ω3＝8％、ω4＝10％）재직류자장작용하적과랭도급과랭태시간적변화，재냉각화동결과정중기록용액온도화시간。결과표명：대우거리자수，직류자장회제고과랭도，과랭시간회유소연장；이대우자당용액，불동강도적직류자장대불동질량분수적자당용액과랭과정적영향정현다겁치현상。해시험결과가이위자장응용우공제용액적냉동간조과정제공지도。
In order to study changing laws of supercooling degree and supercooling time of solution under different mag-netic 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 super-cooling time of deionized water,but the influence on the supercooling process of sucrose solution with different concen-tration presented a multi-extreme phenomenon.Research results could provide a reference for controlling freeze drying process of solution by applying magnetic field.