纳米气泡对有机溶液表观黏度的影响研究

Effect of nanobubbles on the apparent viscosity of organic solutions

为了研究纳米气泡(NB)对有机溶液表观黏度的影响,利用无机陶瓷膜在溶液中产生纳米气泡后监测溶液的表观黏度变化,并利用计算流体动力学(CFD)模拟计算溶液内鼓入纳米气泡后表观黏度的变化情况以验证实验结果。实验结果表明:0.3 MPa压力下,纳米气泡的粒径分布在125~425 nm范围内,且液面纳米气泡的存在使水的平均表面张力从72.0减小至68.1 mN·m^(-1)。此外,经30 min鼓泡处理后,水、牛血清白蛋白(BSA)和海藻酸钠(SA)溶液的表观黏度分别从1.07、1.3和2.27 mPa·s减小至1.01、1.24和2.21 mPa·s,且随着纳米气泡浓度的增大,溶液的表观黏度持续降低。采用计算流体动力学种群耦合模型(CFD-PBM)模拟计算后溶液表观黏度的变化趋势与实验结果相一致,证实了纳米气泡在降低溶液表观黏度方面的效用。

In order to investigate the effect of nanobubbles(NB)on the apparent viscosity of organic liquids,inorganic ceramic membranes were used to generate NB in solutions to monitor the apparent viscosity variations of liquids.CFD was used to simulate the variations of apparent viscosity of solutions with NB verify the experimental results.The experimental results show that the particle size distribution of NB is in the range of 125—425 nm at 0.3 MPa and average surface tension of H_(2)O decreases from 72.0 to 68.1 mN·m^(-1)in the presence of NB at the liquid surface.In addition,after bubbling time of 30 min the apparent viscosity of H_(2)O,BSA solution and SA solution decrease from 1.07,1.3 and 2.27 to 1.01,1.24 and 2.27 mPa·s,respectively.The apparent viscosity of the solutions continues to decrease with increasing NB concentration.The simulations by the CFD-PBM coupled model show that the variations of the apparent viscosity of solutions are consistent with the experimental results,confirming the effectiveness of NB in reducing the apparent viscosity of liquids.