Noël M H, Semin B, Hulin J P, Auradou H
Université Pierre et Marie Curie-Paris 6, Université Paris-Sud, CNRS, Orsay, France.
Rev Sci Instrum. 2011 Feb;82(2):023909. doi: 10.1063/1.3556445.
A robust and precise viscometer using the forces exerted by a laminar flow inside a small duct is presented: the force is measured on a long cylindrical sensor dipped into the flow. Two devices of respective volumes 1.4 and 0.031 ml have been realized, demonstrating that the technique is usable with small fluid volumes. Several Newtonian and non-Newtonian fluids have been tested at shear rates ranging from 0.3 to 10 s(-1) for the first device and from 85 to 2550 s(-1) for the second one. For Newtonian fluids, of viscosities ranging from 10(-3) to 0.1 Pa s, the linear response of the device has been verified and a 90% agreement with the values provided by commercial rheometers is obtained. For non-Newtonian polymer solutions, the variation of the force with the flow velocity allows one to determine the dependence of the viscosity on the shear rate. Two shear thinning polymer solutions with a power law behavior at intermediate shear rates have been investigated and their rheological parameters have been determined.
本文介绍了一种坚固且精确的粘度计，它利用小管道内层流施加的力：力是在浸入流中的长圆柱形传感器上测量的。已经制作了两个体积分别为1.4和0.031毫升的装置，证明该技术可用于小体积流体。对于第一个装置，在0.3至10 s⁻¹的剪切速率范围内测试了几种牛顿流体和非牛顿流体；对于第二个装置，在85至2550 s⁻¹的剪切速率范围内进行了测试。对于粘度范围为10⁻³至0.1 Pa·s的牛顿流体，已验证了该装置的线性响应，并与商业流变仪提供的值有90%的一致性。对于非牛顿聚合物溶液，力随流速的变化使人们能够确定粘度对剪切速率的依赖性。研究了两种在中等剪切速率下具有幂律行为的剪切变稀聚合物溶液，并确定了它们的流变参数。
