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Method and device for measuring liquid viscosity

A technology for measuring device and liquid viscosity, which can be used in measuring devices, instruments, scientific instruments, etc. It can solve the problems of inconvenient measurement of the real viscosity of flowing liquids, and achieve the effects of simple operation, accurate measurement and simple principle.

Pending Publication Date: 2022-05-24
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the deficiencies in the above-mentioned background technology, the present invention proposes a liquid viscosity measurement method and device, which solves the problem that the real viscosity of the flowing liquid in the actual pipe diameter is not easy to measure in the prior art

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  • Method and device for measuring liquid viscosity
  • Method and device for measuring liquid viscosity
  • Method and device for measuring liquid viscosity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0042] Embodiment 2, a measuring method of a liquid viscosity measuring device, comprising the following steps: S1: when the liquid in the measuring tube 12 performs laminar flow motion and the flow rate of the liquid is stable, adjust the suspension line according to the liquid flow rate or the deflection angle of the suspension line The length of 19 is such that the small ball 18 suspended in the measuring tube 12 is located on the central axis of the measuring tube 12, and the average flow rate of the liquid in the measuring tube 12 obtained through the flow meter 17 is:

[0043] S2: When the liquid velocity on the central axis of the measuring pipe 12 is equal to twice the average velocity of the liquid in the pipe When the liquid is in laminar motion, the flow velocity of the liquid at the tube wall is 0, and the flow velocity on the central axis is the largest, so the average velocity of the liquid is 1 / 2 of the velocity at the central axis. The deflection angle of th...

Embodiment 3

[0063] Embodiment 3, the liquid viscosity measurement method involved in the present invention requires the liquid to perform laminar flow motion. Reynolds number is the basis for judging liquid flow characteristics. Taking the water flowing in the measuring tube 12 as an example, when the Reynolds number is less than 2300, the water moves in laminar flow; when the Reynolds number is greater than 4000, the water moves in turbulent flow; when the Reynolds number is in the range of 2300-4000, the flow characteristics of water are between Between laminar and turbulent motion, it is a transition state.

[0064] The Reynolds number is related to parameters such as the flow velocity v of the liquid, the density ρ of the liquid, the viscosity η of the liquid and the characteristic length L, and satisfies the relationship: Re=ρvL / η.

[0065] Regarding the characteristic length L and the flow velocity v, there are two cases: inflow and outflow. The so-called internal flow refers to t...

Embodiment 4

[0105] The transparent measuring tube is made of PVC material with an inner diameter of 20.00mm and an outer diameter of 25.00mm.

[0106] The test ball is agate ball with a radius of 1.889mm and a density of 2647kg / m 3 .

[0107] The liquid to be tested is an aqueous solution of sucrose, the mass percentage is 50wt% (5kg sucrose+5kg water), and the density is 1229kg / m 3 , the viscosity is 15.54mPa·s (20℃).

[0108] The liquid flow rate can be controlled by the regulating valve, and the value can be directly read through the instrument (the flowmeter connected to the pipeline or the externally connected ultrasonic flowmeter can be selected).

[0109] During the test, adjust the liquid flow rate to a suitable size, and adjust the length of the ball suspension line to make the ball stable on the central axis of the transparent measuring tube. At this time, record the liquid flow rate and the deflection angle of the ball suspension line. The detailed data are as follows: :

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Abstract

The invention discloses a method and a device for measuring liquid viscosity, which are suitable for measuring the viscosity of transparent liquid. The method has the characteristics of simple principle, simplicity and convenience in operation, accurate measurement and the like. The core part of the device is that a small ball is hung in a transparent pipeline through a fine line. When liquid flows through the transparent pipeline in a laminar flow mode, the suspension line for suspending the small ball generates a certain deflection angle theta, and at the moment, the small ball is subjected to viscous force acting on the small ball by the liquid, buoyancy acting on the small ball by the liquid, gravity of the small ball and pulling force acting on the small ball by the suspension line. By adjusting the flow rate of the liquid and the length of the suspension line of the small ball, the small ball is located on the central axis of the pipeline under the action of the four forces and reaches a balanced state. The relationship between the liquid viscosity eta liquid and the flow velocity and the suspension line deflection angle theta is established by utilizing the balance relationship of four forces borne by the small ball, and the liquid kinematic viscosity eta liquid can be calculated by measuring the liquid flow velocity and the suspension line deflection angle theta.

Description

technical field [0001] The invention relates to the technical field of liquid viscosity measurement, in particular to a liquid viscosity measurement method and device. Background technique [0002] At present, liquid viscosity measurement methods include falling ball method, rotation method, vibration method and capillary method. Among them, the falling ball method, the rotation method and the vibration method all use the relative motion of the liquid (ie: the liquid does not flow, the ball / rotor / vibrator moves, and the liquid moves relative to the ball / rotor / vibrator). The above methods cannot reflect The true viscosity of the flowing liquid; although the capillary method adopts the absolute motion of the liquid, which can reflect the viscosity of the flowing liquid, but because the diameter of the capillary is much smaller than that of the actual pipe, the viscosity of the liquid measured by the capillary method cannot reflect the actual viscosity of the pipe. The true vi...

Claims

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Application Information

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IPC IPC(8): G01N11/12
CPCG01N11/12
Inventor 朱祥李海宁袁朝圣姜倩梁永福周松程学瑞王征
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY