Abstract Monitoring and control of inline viscosity is crucial for process optimisation and for ensuring a high quality final product but currently this parameter is still under-utilised in the dairy industry. This study investigated a solid-state bulk acoustic wave sensor to measure the viscosity of Newtonian (oil standards) and Non-Newtonian fluids (reconstituted skim milk (RSM) at different concentrations) under static (off-line measurements) and flow conditions (in-line measurements). Results illustrated that an increase in total solids (TS) of RSM gave an increase in acoustic viscosity. Non-linear regression was applied to the experimental data to successfully transform the acoustic viscosity outputs into commonly-used reference viscosity values. RSM at higher TS presented a non-Newtonian behaviour and demonstrated shear-thinning properties. Under flow conditions the viscosity of the RSM decreased as a result of shearing experienced in the pipe. This study demonstrated the potential of an acoustic wave sensor to measure in-line viscosity in dairy applications.

中文翻译：

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评估固态体声波传感器在静态和流动条件下测量牛顿和非牛顿流体的粘度

摘要 在线粘度的监测和控制对于工艺优化和确保高质量的最终产品至关重要，但目前该参数在乳制品行业仍未得到充分利用。本研究调查了一种固态体声波传感器，用于在静态（离线测量）和流动条件（在流动条件下）下测量牛顿流体（油标）和非牛顿流体（不同浓度的复原脱脂牛奶 (RSM)）的粘度。 - 线测量）。结果表明，RSM 总固体 (TS) 的增加导致声学粘度的增加。非线性回归应用于实验数据，成功地将声学粘度输出转换为常用的参考粘度值。较高 TS 下的 RSM 表现出非牛顿行为并表现出剪切稀化特性。在流动条件下，由于管道中经历的剪切，RSM 的粘度降低。这项研究证明了声波传感器在乳制品应用中测量在线粘度的潜力。