Method and device for simultaneously measuring surface tension and viscosity of liquid on line

A technology of liquid surface tension and viscosity, applied in measurement devices, surface tension analysis, indirect flow characteristics measurement, etc., can solve the problems of limited pixel size and field of view, complex data processing, etc., to achieve simple operation and improve time resolution. Fast, time-consuming effect

Pending Publication Date: 2020-12-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, direct imaging methods such as high-speed photography are used to observe the shape changes of droplets, but this method is limited by the pixel size and field of view, and the droplet contour needs to be fitted, and the data processing is more complicated.

Method used

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  • Method and device for simultaneously measuring surface tension and viscosity of liquid on line
  • Method and device for simultaneously measuring surface tension and viscosity of liquid on line
  • Method and device for simultaneously measuring surface tension and viscosity of liquid on line

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Embodiment 1

[0052] Such as figure 1 As shown, it is a schematic structural diagram of a device for simultaneous online measurement of liquid surface tension and viscosity provided by the present invention, including a droplet generation unit, a sheet laser beam expander unit, and a signal acquisition and processing unit. Wherein, the droplet generation unit includes a monodisperse droplet generator 7, a syringe pump 8 and a piezoelectric driver 9 for generating a stable monodisperse droplet flow 10; the sheet laser beam expander includes a laser 1, a beam expander 2 and The reflector 3 is used to generate a sheet light source and irradiate the droplet flow; the signal acquisition and processing unit includes a field of view lens 4 , a horizontal slit diaphragm 5 and an area array digital camera 6 . Moreover, the sheet laser beam expansion unit and the signal acquisition and processing unit are respectively located on two linear guide rails.

[0053] Specifically, in this embodiment: the ...

Embodiment 2

[0064] Such as figure 2 As shown, another device for simultaneous online measurement of liquid surface tension and viscosity provided by the present invention includes a droplet generation unit, a sheet laser beam expander unit, and a signal acquisition and processing unit. Wherein, the droplet generation unit includes a single droplet generator 12, a syringe pump 8, and a piezoelectric driver 9 for generating an oscillating single droplet 13; the sheet laser beam expander includes a laser 1, a beam expander 2, and a mirror 3 , used to generate a sheet light source and irradiate the liquid droplet and its motion trajectory; the signal acquisition and processing unit includes a field of view lens 4 and a line-scan digital camera 11 . The method for measuring liquid surface tension and viscosity with said device comprises the following steps:

[0065] Step 1: Turn on the droplet generating unit: use a hose to connect the syringe pump 8 and the single droplet generator 12, and ...

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Abstract

The invention discloses a method for simultaneously measuring surface tension and viscosity of liquid on line. The method comprises the following steps: forming, by a liquid drop generation unit, liquid drops oscillating in a second-order mode, wherein the laser irradiates the oscillated liquid drops and the motion trails of the liquid drops to generate rainbow signals; recording a rainbow image of the spherical liquid drop when the oscillated ellipsoidal liquid drop is in a steady state; obtaining a calibration curve of a pixel column and a scattering angle; extracting signals in the rainbowimage, and aligning the signals to the calibration curve, conducting inversion on the rainbow image, and acquiring the refractive index and the radius of the spherical liquid drop; according to the rainbow angle deviation of the rainbow image, obtaining the evolution condition of the ellipticity in the liquid drop falling process; converting the ellipticity into oscillation amplitude information and fitting to obtain the oscillation frequency and the time constant of the damped oscillation function, and respectively obtaining the surface tension and the viscosity value of the liquid. The invention further discloses a device for simultaneously measuring the surface tension and the viscosity of the liquid on line. According to the method and the device, microsecond-order droplet oscillationtracking is realized, and the spatial and temporal resolution of measurement is improved.

Description

technical field [0001] The invention relates to the field of on-line measurement of liquid thermophysical properties, in particular to a method and device for simultaneous on-line measurement of liquid surface tension and viscosity. Background technique [0002] Surface tension and viscosity are important physical and chemical properties of liquids, and are commonly used basic data in many scientific research and engineering applications such as medicine, food, fuel atomization and multiphase reactions. At present, the commonly used methods for measuring the surface tension and viscosity of liquids are: the capillary rise method, which drives the liquid through the capillary by external pressure, and measures the height of the liquid in the capillary and the liquid flow rate to calculate the surface tension and viscosity of the liquid; the maximum bubble method, which measures the bubbles The inner radius of the capillary when the pressure in the bubble is at its maximum; dr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/02G01N11/00G01N21/84
CPCG01N11/00G01N13/02G01N21/84G01N2011/008G01N2021/8411
Inventor 吴迎春吴学成吕绮梦陈玲红邱坤赞高翔岑可法
Owner ZHEJIANG UNIV
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