Device and method for measuring the viscosity of a fluid

摘要

The invention relates to a method for measuring the viscosity of a fluid, said method comprising the following steps: (a) providing a flow of said fluid in a laminar state inside a channel (14, 24) having a characteristic transverse dimension D, and in which an elongate member (12, 22) having a characteristic dimension d is placed substantially along the longitudinal direction of said channel and substantially at the center of the channel, and has a portion of the length l thereof submerged in said channel; (b) measuring the friction force (f) applied by said fluid on the walls of the elongate member; and (c) calculating the dynamic viscosity (η) of said fluid based on the equation (1) f=ληlU where U is the average flow rate and λ is a geometric factor.

主权项

1. A method of measuring the viscosity of a fluid, the method comprising the following steps:
a) establishing a flow of said fluid under laminar conditions inside a channel (14, 24) having a longitudinal direction and an opening with a dimension D, which is transverse to the longitudinal direction, an elongate element (12, 22) having a transverse dimension d corresponding to a greatest dimension in a cross section thereof, being placed in said channel substantially along the longitudinal direction thereof and substantially at a center thereof and along the dimension D, a fraction l of the length of the elongate element being immersed in said channel, the ratio D/d being greater than 5; b) measuring the friction force (f) exerted by said fluid on the walls of said elongate element; c) calculating the dynamic viscosity (TO of said fluid using the following equation:
f=ληlU  (1)where:
U is the mean speed of the flow; and λ is a geometrical factor, and wherein steps b) and c) are implemented in succession for different positions of said elongate element in said channel, along the characteristic transverse dimension D.