Boycott效应的实验探究和PNK理论的修正

Experimental exploration of Boycott effect and modification of PNK theory

试管倾斜时悬浮颗粒的沉降速率比试管竖直时的快,这就是Boycott效应.对该效应的理论解释则众说纷纭.本文以颗粒大小、试管倾角和颗粒密度为变量,进行了Boycott效应的实验探究.在实验中,利用Liang-kai Huang模糊阈值法处理图像,精确测定了沉降速率,理论方面基于Krieger-Dougherty模型对传统的PNK理论进行了黏度的修正,与实验结果符合较好.

When a test tube is tilted,the settling rate of suspended particles is faster than that when the test tube is vertical.This is known as Boycott effect which has been subject to various theoretical explanations.In this study,Boycott effect is experimentally investigated with particle size,test tube tilt angle and particle density as variables.Liang-kai Huang′s fuzzy threshold method is used to accurately determine the settling rate from images obtained during experiments.The Krieger-Dougherty model is used to modify the traditional PNK theory of viscosity coefficient in the theoretical analysis.The results from the experiment are in good agreement with the modified theory.