Abstract:

It is a common sense that the scale from the water dispenser may lead to health problem and the magnetized water has a certain scale inhibition function.Permanent magnets are easier to install with lower cost for scale inhibition of drink water comparing it to the solenoid with electric current twined the water pipe for scale inhibition of industrial fluid.We fix a set of permanent magnets on the outer wall of cool tank to generate constant magnetic field inside the tank.The magnetic flux density distribution in the cylinder tanks by both magnets and solenoid is simulated and compared with COMSOL Multiphysics software.The experiments prove the correctness of the theory that magnetic field imposes Lorentz force on the free ions in the water(abbr.Ion Theory) and also charged particles(abbr.Particle Theory).Meanwhile, Lorentz force on charged particles is much stronger than the free ions.Constant magnetic field may slow down the production of CaCO₃.Under the ambient temperature, the scale inhibition rate reaches as high as 29%.Under the condition of long-term heating up the water, the permanent magnet group has a better scale inhibition effects comparing with the blank group.Finally, we calculate the concentration of each component in the tank based on the data of pH value and calcium concentration.We use the concentration of CaCO₃ to calculate the scale inhibition rate which is difficult to measure.

Key words: water dispenser, constant magnetic field, magnetic flux density, fouling, permanent magnet, particle, aqueous solution

摘要：

饮水机水垢可能引起健康问题，磁化水具有一定的阻垢作用。提出一种固定于饮水机水池外壁的永磁体恒定磁场发生装置，其经济性与易安装维护明显优于工业流体阻垢方法中常见的螺线管恒定磁场装置，同时采用有限元仿真软件COMSOL Multiphysics分析两者圆柱水池内部的磁感应强度分布规律。针对普遍认可的磁场对水体内各种游离离子的洛仑兹力（离子理论）和带电粒子的洛仑兹力（粒子理论）机理进行永磁体实验验证，结果表明：后者强于前者；恒定磁场能够减缓CaCO₃生成，在常温下的阻垢率可达29%；与空白组相比，长期烧水状态下永磁组饮水机的阻垢效果明显。最后，基于pH和钙离子浓度推算了溶液中各个组分的浓度，其中的CaCO₃含量用于阻垢率的计算解决了其难以测量的困难。

关键词: 饮水机, 恒定磁场, 磁感应强度, 结垢, 永磁体, 粒子, 水溶液