We propose in this paper to use a simple and robust experimental protocol based on longitudinal ultrasonic velocity measurement in order to evaluate the viscosity of coconut water in a cylindrical stainless-steel pipe. Seven samples with Soluble Solids Content (SSC) ranging from 6.7 to 44.2°Brix were studied using conventional Couette viscometry and high-frequency ultrasonic methods. Calibration laws linking the ultrasonic velocity measured at 5 MHz to the shear viscosity and to the SSC are proposed. These laws are in very good agreement with previous measurements carried out several years ago using a plane 25 MHz transducer directly introduced into the coconut water with SSC of up to 60 °Brix.

我们建议在本文中使用一种基于纵向超声速度测量的简单而可靠的实验方案，以评估圆柱形不锈钢管中椰子水的粘度。使用常规库埃特粘度计和高频超声方法研究了7个样品的可溶性固形物含量（SSC）为6.7至44.2的白利糖度。提出了将在5 MHz处测得的超声波速度与剪切粘度和SSC相关联的校准定律。这些定律与几年前使用平面25 MHz换能器直接进行测量的SSC高达60°Brix的椰子水完全吻合。