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    王云超, 翟华博, 宫金良, 等. 磁场对异丙甲草胺除草剂溶液表面张力与雾滴粒径的影响规律[J]. 华南农业大学学报, 2023, 44(2): 324-332. doi: 10.7671/j.issn.1001-411X.202202020
    引用本文: 王云超, 翟华博, 宫金良, 等. 磁场对异丙甲草胺除草剂溶液表面张力与雾滴粒径的影响规律[J]. 华南农业大学学报, 2023, 44(2): 324-332. doi: 10.7671/j.issn.1001-411X.202202020
    shu
    WANG Yunchao, ZHAI Huabo, GONG Jinliang, et al. Effect of magnetic field on surface tension and droplet size of metolachlor herbicide solution[J]. Journal of South China Agricultural University, 2023, 44(2): 324-332. doi: 10.7671/j.issn.1001-411X.202202020
    Citation: WANG Yunchao, ZHAI Huabo, GONG Jinliang, et al. Effect of magnetic field on surface tension and droplet size of metolachlor herbicide solution[J]. Journal of South China Agricultural University, 2023, 44(2): 324-332. doi: 10.7671/j.issn.1001-411X.202202020
    shu

    磁场对异丙甲草胺除草剂溶液表面张力与雾滴粒径的影响规律

    Effect of magnetic field on surface tension and droplet size of metolachlor herbicide solution

      摘要
    • 摘要:
      目的  研究磁化作用对除草剂溶液表面张力及除草剂喷雾雾滴粒径的影响规律，探索新型除草剂喷雾雾滴粒径控制方法。
      方法  设计磁化除草剂溶液表面张力试验和磁化喷雾雾滴粒径试验，记录不同磁场强度和磁化时长2个影响因素下除草剂溶液表面张力和喷雾雾滴粒径，观测数据变化规律；并对数据进行拟合，给出符合数据变化的函数关系式。
      结果  在磁场强度为50~500 mT、磁化时长为5.0~25.0 min范围内，溶液表面张力和喷雾雾滴粒径均随磁场强度和磁化时长的增加呈现先下降后回升的趋势；当磁场强度为350 mT、磁化时长为15.0 min时，表面张力和雾滴粒径下降幅度最大，表面张力为54.0 mN/m，下降14.96%，喷雾雾滴粒径为108.75 μm，下降11.20%。对表面张力数据进行拟合，洛伦兹拟合函数的决定系数(R2)为0.816 4，调整后R2为0.794 0，均方根误差(Root mean square error，RMSE)为1.105 9；雾滴粒径数据拟合中，多项式拟合函数的R2为0.833 6，调整后R2为0.787 4，RMSE为2.085 7。拟合函数有意义且拟合精度较高。
      结论  磁化作用并不是磁场强度越大或磁化时长越长磁化效果越好，而是存在最佳磁化处理强度和磁化时长；本研究给出的洛伦兹模型函数可作为除草剂溶液表面张力与磁化作用的函数关系式，三次多项式函数可作为350 mT磁场强度下雾滴粒径调控模型。

       

      Abstract:
      Objective  To study the effect of magnetization on surface tension of herbicide solution and particle size of herbicide spray droplet, and explore a new control method of particle size of herbicide spray droplet.
      Method  The surface tension experiment of the magnetized herbicide solution and the particle size experiment of the magnetized spray droplet were designed to record the surface tension value of the herbicide solution and the particle size value of the spray droplet under the influence of two factors of different magnetic field intensity and magnetization duration, observe the change rule of the data, and fit the data, and give the functional relationship that conforms to the description of the data change.
      Result  When the magnetic field intensity was 50−500 mT and magnetization duration was 5.0−25.0 min, both the surface tension of solution and the particle size of spray droplet decreased firstly and then rose with the increase of magnetic field intensity and magnetization duration. When the magnetic field intensity was 350 mT and magnetization duration was 15.0 min, the surface tension and particle size of spray droplet decreased the most. The surface tension value decreased to 54.0 mN/m with a drop rate of 14.96%, and the spray droplet size decreased to 108.75 μm with a drop rate of 11.20%. For surface tension data, the determination coefficient (R2) of Lorentz fitting function was 0.816 4, adjusted R2 was 0.794 0, root mean square error (RMSE) was 1.105 9; And the R2 of polynomial fitting function for spray droplet size data was 0.833 6, adjusted R2 was 0.787 4, RMSE was 2.085 7. The fitting function was meaningful and the fitting precision was high.
      Conclusion  It is not that the magnetization effect will be better with the increase of magnetic field intensity or magnetization duration, but that the optimal magnetization intensity and duration exist. The Lorentz model function given in this paper can be used as the function relation between the surface tension of herbicide solution and magnetization, and the cubic polynomial function can be used as the model for controlling the particle size of fog droplets under the magnetic field intensity of 350 mT.

       

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