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Method for measuring viscosity of Newtonian fluid by utilization of pressure drop of micro-channel

A micro-channel and pressure technology, applied in the field of Newtonian fluid viscosity acquisition, can solve problems such as large time measurement error

Inactive Publication Date: 2014-12-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The contact part between the metal wire and the liquid surface of this kind of instrument is not easy to disconnect immediately, and the time measurement error is relatively large

Method used

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  • Method for measuring viscosity of Newtonian fluid by utilization of pressure drop of micro-channel
  • Method for measuring viscosity of Newtonian fluid by utilization of pressure drop of micro-channel
  • Method for measuring viscosity of Newtonian fluid by utilization of pressure drop of micro-channel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Taking 75wt% glycerol aqueous solution as the benchmark system (A), at 25°C, its viscosity value is 28.9mPa·s, and 70wt%, 78wt%, 81.3wt%, 85wt%, 88wt% glycerol aqueous solution is the system to be tested ( B), using the method described in the present invention, the measured viscosity values ​​are 18.45, 39.01, 54.92, 84.94, 129.45mPa·s, respectively, and the viscosity values ​​measured by a commercial rotational viscometer are 17.67, 39.06, 57.59 , 84.38, 134.48mPa·s, the average relative deviation of the two groups of data is only 2.7%. Table 1 shows the data points of the pressure drop and the corresponding flow rate of the reference system and the system to be tested.

[0048]

[0049] Table 1

Embodiment 2

[0051] Taking 78wt% glycerol aqueous solution as the benchmark system (A), at 25°C, its viscosity value is 39.06mPa·s, and 70wt%, 75wt%, 81.3wt%, 85wt%, 88wt% glycerol aqueous solution is the system to be tested ( B), using the method set forth in the present invention, the measured viscosity values ​​are 18.47, 28.93, 54.99, 85.04, 129.60mPa·s, respectively, while the viscosity values ​​obtained by using a commercial rotational viscometer are 17.67, 28.90, 57.59, 84.38, 134.48mPa·s, the average relative deviation of the two groups of data is only 2.7%. Table 2 is the data of the pressure drop and the corresponding flow rate of the reference system and the system to be tested.

[0052]

[0053] Table 2

Embodiment 3

[0055] Taking 70wt% glycerol aqueous solution as the benchmark system (A), at 25°C, its viscosity value is 17.67mPa·s, and taking 75wt%, 78wt%, and 85wt% glycerol aqueous solution as the system (B) to be tested, using the method of the present invention. According to the method described, the measured viscosity values ​​are 27.68, 37.37, and 81.36 mPa·s, respectively, while the viscosity values ​​measured by a commercial rotational viscometer are 28.9, 39.06, and 84.38, respectively. The average relative deviation of the two sets of data is only 4.1 %. Table 3 is the data of the pressure drop and the corresponding flow rate of the reference system and the system to be tested.

[0056]

[0057] table 3

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Abstract

The invention provides a method for measuring and calculating viscosity of a Newtonian fluid based on Poiseuille law. The measuring steps contain: arranging a capillary coil pipe and a micro-channel in series connection and placing in a constant temperature bath, injecting a liquid into the coil pipe through a pump and letting the liquid enter the 0.1-1 mm micro-channel, measuring pressure drop of a fluid A with known viscosity and a fluid B to be measured between two fixed points in the micro-channel through a sensor, and acquiring the viscosity of the fluid B to be measured according to the calculation formula as defined in the specification, wherein mu is viscosity; delta P is pressure drop; U is linear velocity of the Newtonian fluid in the straight micro-channel; i is the changing times of flow velocity; and the formula as shown in the specification is linear value of pressure drop and flow velocity in statistics. The invention has the following characteristics: measuring equipment has a simple structure; the amount of the liquid to be measured is small; the algorithm is simple and reliable; and viscosity of the Newtonian fluid and its variation with the temperature can be conveniently, rapidly and accurately obtained.

Description

technical field [0001] The invention relates to a method for obtaining Newtonian fluid viscosity, in particular to a method for calculating Newtonian fluid viscosity by means of a ratio algorithm by measuring the pressure drop between two fixed points of a Newtonian fluid of known viscosity and unknown viscosity flowing through a microchannel. Background technique [0002] At present, commercial instruments for measuring the viscosity of Newtonian fluids include rotational viscometers, capillary viscometers, and falling ball viscometers. Rotational viscometers are widely used. The basic principle is that when an axisymmetric object such as a cylinder or a disk rotates in a liquid, the shear force acting on the surface of the liquid will form a friction torque, and the viscosity of the liquid can be measured according to the magnitude of the torque. . The rotational viscometer method has high measurement accuracy, good repeatability, and simple operation. However, this metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N11/08
Inventor 陈光文苏远海焦凤军
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI