Method for measuring liquid viscosity by utilization of capillary and device used for method

A capillary, liquid technology, applied in the field of analytical chemistry, can solve the problems of only being affected by gravity, calculating the liquid flow rate, and cannot change the pressure, etc., to achieve the effect of reliable results, easy data acquisition, and simple calculation.

Inactive Publication Date: 2015-08-26
PETROCHINA CO LTD +1
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Problems solved by technology

These measurement methods have their limitations: first, the existing capillary viscometer calculates its flow rate by measuring the time for a certain volume of liquid to pass through the vertical capillary under the action of gravity, and calculates the viscosity of the target liquid through relevant theories, And the test must have a reference standard sample, by measuring the flow rate of the standard liquid with known viscosity and the sample to be tested with unknown viscosity, and comparing the two to obtain the viscosity of the sample to be tested; second, during the test process Among them, the flow rate of the liquid falling is only affected by gravity, and the pressure of the test cannot be changed, which has great limitations for some samples whose viscosity changes under different pressure or shear; the third The inner diameter of the capillary, the core component of the existing capillary viscometer, is generally 0.1 mm to 10 mm. However, if the viscosity of the liquid below the micron level needs to be investigated, it is impossible to calculate the flow rate of the liquid by determining the volume of the liquid.

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  • Method for measuring liquid viscosity by utilization of capillary and device used for method

Examples

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Embodiment 1

[0040] At temperature T=25.3°C, in a capillary with an inner diameter of 1.7 μm (radius of 0.85 μm) and a total length of L=178 mm, the length of the water column L w =38mm, the measured v(ΔP) relationship line is v=2.41ΔP+406, and the slope of the line is k=2.41μm·s -1 kPa -1 , then the viscosity η of water w =0.85 2 / (8×2.41×38)=0.99×10 -3 Pa·s; water column length L w When =68mm, the measured v(ΔP) relationship line is v=1.362ΔP+217, and the slope of the line is k=1.362μm·s -1 kPa -1 , then the viscosity η of water w =0.85 2 / (8×1.362×68)=0.98×10 -3 Pa·s; water column length L w When =88mm, the measured v(ΔP) relationship line is v=0.967ΔP+166, and the slope of the line is k=0.967μm·s -1 kPa -1 , then the viscosity η of water w =0.85 2 / (8×0.967×88)=1.06×10 -3 Pa s; then in a capillary with an inner diameter of 1.7 μm, the viscosity of water is η w =(0.99×10 -3 Pa·s+0.98×10 -3 Pa·s+1.06×10 -3 Pa·s) / 3=1.01×10 -3 Pa·s.

Embodiment 2

[0042] When the temperature T=24.6°C, the inner diameter is 11.26 μm (the radius is 5.63 μm), in the capillary of total length L=181mm, the liquid column length L of 65% by weight glycerol (glycerol, the same below) aqueous solution g When =50mm, the measured v(ΔP) relationship line is v=3.64ΔP+100, and the slope of the line is k=3.64μm·s -1 kPa -1 , then the viscosity η of 65% glycerol aqueous solution g =5.63 2 / (8×3.64×50)=21.8×10 -3 Pa·s; 65% glycerin aqueous solution liquid column length L g =80mm, the measured v(ΔP) relationship line is v=2.30ΔP+62.8, and the slope of the line is k=2.30μm·s -1 kPa -1 , then the viscosity η of 65% glycerol aqueous solution g =5.63 2 / (8×2.30×80)=21.5×10 -3 Pa·s; 65% glycerin aqueous solution liquid column length L g =110mm, the measured v(ΔP) relationship line is v=1.64ΔP+43.5, and the slope of the line is k=1.64μm·s -1 kPa -1 , then the viscosity η of 65% glycerol aqueous solution g =5.63 2 / (8×1.64×110)=22.0×10 -3 Pa s; th...

Embodiment 3

[0044] At temperature T=25.8°C, in a capillary with an inner diameter of 205 μm (radius of 102.5 μm) and a total length of L=178 mm, the liquid column length L of 99% by weight glycerin aqueous solution g When =57mm, the measured v(ΔP) relationship line is v=33.18ΔP+43.25, and the slope of the line is k=33.18μm·s -1 kPa -1 , then the viscosity η of 99% glycerol aqueous solution g =102.5 2 / (8×33.18×57)=0.694Pa·s; 99% glycerin aqueous solution liquid column length L g When =77mm, the measured v(ΔP) relationship line is v=24.57ΔP+30.99, and the slope of the line is k=24.57μm·s -1 kPa -1 , then the viscosity η of 99% glycerol aqueous solution g =102.5 2 / (8×24.57×77)=0.694Pa·s; 99% glycerin aqueous solution liquid column length L g =97mm, the measured v(ΔP) relationship line is v=19.20ΔP+25.93, and the slope of the line is k=19.20μm·s -1 kPa -1 , then the viscosity η of 99% glycerol aqueous solution g =102.5 2 / (8×19.20×97)=0.705Pa s; then in a capillary with an inner ...

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Abstract

The invention discloses a method for measuring a liquid viscosity by utilization of a capillary and a device used for the method. The method is as follows: at a certain temperature, two ends of a capillary liquid are applied with pressure, a liquid interfacial movement rate is measured, a v(delta P) relation straight line is constructed, a gradient of the straight line is obtained, and the liquid viscosity is calculated according to a known capillary radius and a known liquid column length. Through the method, a viscosity of a single liquid can be measured. When two immiscible liquids are coexistent and the viscosity of one liquid is known, the viscosity of the other liquid can be measured through the method. The capillary employed for measurement in the method is in a micrometer level, and the viscosity scope of a liquid to be measured is 5*10<-4>-10Pa.s. The measuring device in the measuring method is simple in structure and is reasonable in design, parameters are convenient to control and results are reliable.

Description

technical field [0001] The invention relates to a method for measuring liquid viscosity with a capillary, belonging to the field of analytical chemistry. Background technique [0002] Capillary is a necessary component in instrument analysis and seepage mechanics experiment. As the core part of analytical components, capillary plays an important role in the fields of physical and chemical analysis, pharmaceutical analysis, environmental analysis, and life science analysis. The current development of the field of analysis to the microscopic scale is the extension and progress of the exploration of the microscopic world and the low-consumption and non-destructive analysis of samples. In addition, in many cases, the same substance may exhibit different physical and chemical properties at the macro-scale and micro-scale. The actual situation does not match. [0003] At present, capillary viscometers (Oswald viscometer, Ubbelohde viscometer, etc.) are widely used in instrument...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/04
Inventor 李文宏赵继勇李兆国张永强王丽莉范伟
Owner PETROCHINA CO LTD
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