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Method and device for measuring capillary inner diameter

A capillary, inner diameter technology, applied in the basic research of seepage mechanics, analytical chemistry, to achieve the effect of reliable data, easy to use, improve work efficiency and accuracy

Inactive Publication Date: 2011-04-13
WUHAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are only suitable for measuring capillary tubes with an inner diameter in the range of millimeters (0.01-0.1cm).

Method used

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  • Method and device for measuring capillary inner diameter
  • Method and device for measuring capillary inner diameter
  • Method and device for measuring capillary inner diameter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] At temperature T=25.6°C, in a capillary with a nominal inner diameter of 2 μm (radius 1 μm) and a total length of L=128 mm, the length of the water column L w =53.80mm, water column length L w =53.80mm, measure several sets of v values ​​and corresponding ΔP values ​​respectively, draw a straight line of v(ΔP), and obtain P from the straight line intercept c =157.82kPa, then the radius r=2γ 水 / P c =(2×72mN / m) / (157.82kPa)=0.91μm; water column length L w When =68.80mm, several sets of v values ​​and corresponding ΔP values ​​are measured respectively, and a v(ΔP) relationship line is drawn, and P is obtained from the straight line cross-section c =157.15kPa, then the radius r=2γ 水 / P c =(2×72mN / m) / (157.15kPa)=0.92μm; then the actual radius r=(0.91μm+0.92μm) / 2=0.92μm of the capillary whose nominal inner diameter is 2μm (radius 1μm).

Embodiment 2

[0041] When the temperature T=25.3°C, the decane column length L in a capillary with a nominal inner diameter of 40 μm (radius 20 μm) and a total length L=123 mm (the inner surface has been hydrophobized) w When =57.6mm, several sets of v values ​​and corresponding ΔP values ​​are measured respectively, and a v(ΔP) relationship line is drawn, and P is obtained from the straight line cross-section c =157.82kPa, then the radius r=2γ 癸烷 / P c =(2×23.83mN / m) / (2.407kPa)=19.8μm; decane column length L w When =72.6mm, several sets of v values ​​and corresponding ΔP values ​​are measured respectively, and a v(ΔP) relationship line is drawn, and P is obtained from the straight line cross-section c =157.15kPa, then the radius r=2γ 癸烷 / P c =(2×23.83mN / m) / (2.419kPa)=19.7μm; then the actual radius r=(19.8μm+19.7μm) / 2=19.8μm of the capillary whose nominal inner diameter is 40μm (radius 20μm).

Embodiment 3

[0043] At temperature T=25.7°C, in a capillary with a nominal inner diameter of 0.1mm (radius 50μm) and a total length of L=125mm, the water column length L w When =55.30mm, several sets of v values ​​and corresponding ΔP values ​​are measured respectively, and a v(ΔP) relationship line is drawn, and P is obtained from the straight line cross-section c =289.7Pa, then the radius r=2γ 水 / P c =(2×72mN / m) / (289.7Pa)=497μm; water column length L w When =70.30mm, several sets of v values ​​and corresponding ΔP values ​​are measured respectively, and a v(ΔP) relationship line is drawn, and P is obtained from the straight line cross-section c =288.6Pa, then the radius r=2γ 水 / P c =(2×72mN / m) / (288.6Pa)=499μm; then the actual radius r=(497μm+499μm) / 2=498μm of the capillary with a nominal inner diameter of 0.1mm (radius 50μm).

[0044] In the present invention, the inner diameter of the capillary is measured at a temperature of 20-30°C, the purpose of which is to ensure that fluid pr...

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Abstract

The invention discloses a method and device for measuring capillary inner diameter. The method comprises the following steps: pressure is exerted to both ends of capillary fluid at the temperature of 20-30 DEG C, and then a microscope is utilized to amplify the capillary and the interface of gas liquid therein; an optical image is displayed after being transferred to a computer by a CCD detector; the time during which the interface of gas liquid passes the specified length of the screen of the computer is determined, and then the motion velocity of the fluid is calculated combining to the amplification factor; a v (delta P) relation line is made out according to the Washburn equation to obtain Pc value, and then the capillary radius r is calculated according to the Laplace formula. The measuring device comprises a computer, a microscope with a CCD detector, a fluid storage tank, a movable bracket, a pressure sensor, a pressure buffer tank, a pressure display and a gas storage bottle. The measuring range of the method of the invention is within micro scale, which avoids the phenomenon that the density, the quality and the like of the material of the capillary influence the measurement results. The device has simple structure and reasonable design, and the parameter is easy to control.

Description

technical field [0001] The invention relates to a method and a device for measuring the inner diameter of a capillary, which belong to the field of analytical chemistry and also belong to the field of basic research on seepage mechanics. Background technique [0002] Capillary is a necessary component in chromatographic analysis and percolation mechanics experiments. As a component of microanalysis, capillary plays an important role in pharmaceutical analysis, environmental analysis, and life science analysis, and is the core part of the analysis device. Since it is used in a micro-scale seepage environment, accurate measurement of its inner diameter is a prerequisite for correct use. Parameters such as the outer diameter and length of the capillary can be measured with ordinary measuring tools, but its inner diameter and wall thickness are difficult to determine with ordinary tools. [0003] At present, the weighing method and the method of mother and child gauge are comm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B13/10
Inventor 付金华王中才高春宁李学丰武平仓周雯菁余光明董金凤
Owner WUHAN UNIV
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