Experimental device and experimental method for measuring fluid viscosity using microfluidic technology

A microfluidic technology and fluid viscosity technology, applied in the field of microfluidic chips, can solve the problems of low precision, bulky, difficult maintenance, etc., and achieve the effects of high accuracy, low cost, and wide measurement temperature range

Inactive Publication Date: 2018-05-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to propose an experimental device and method for measuring fluid viscosity using microfluidic technology, so as to solve the problems of large volume, low precision and difficult maintenance of the experimental equipment in the current fluid mechanics course experiment

Method used

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  • Experimental device and experimental method for measuring fluid viscosity using microfluidic technology
  • Experimental device and experimental method for measuring fluid viscosity using microfluidic technology
  • Experimental device and experimental method for measuring fluid viscosity using microfluidic technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: Feasibility of deionized water verification experiment

[0041] (1) In order to verify the feasibility of the experiment, at first the test is carried out for deionized water, and the fluorescent particle solution is directly used as the sample for the test, and an appropriate amount of the fluorescent particle solution is injected with the micro-injector 2, and then the micro-injector 2 is set at a constant temperature. Pressure pump 1, after setting the relevant parameters on the constant pressure pump 1 board, the sample can be injected;

[0042] (2) Turn on the constant pressure pump 1 to inject the sample into the microfluidic chip 3, fill the channel of the microfluidic chip 3 with the sample and flow out a little, then suspend the injection, and then start to adjust the upright fluorescence microscope 7 so that the field of view under the eyepiece is micro In the middle section of the 3 channels of the fluidic chip, and the size is appropriate, conn...

Embodiment 2

[0046] Example 2: Flow Field Observation and Simulation Verification of Oil Phase

[0047] The oil phases used are machine oil and glycerin, respectively. The COMSOL Multiphysics simulation software is selected for verification.

[0048] After the surface of the fluorescent particles is treated with hydrophobicity, an oil phase is added to indicate its flow field distribution. The specific operation steps are the same as the observation of the water phase in Example 1, and the inlet pressure is controlled at 1.5 atmospheres. And after completing a group of observations, adjust the temperature of the temperature control system 4 to 348K, and repeat the measurement steps once the system is stable. The flow field distribution of engine oil and glycerin can be obtained as Figure 4 and Figure 5 .

[0049] Depend on Figure 4 It can be seen that under the condition of constant pressure, the oil flow field can be measured by experimental observation. Through fitting, the dynamic...

Embodiment 3

[0052] Example 3: Effect of temperature on oil phase flow field and viscosity result fitting

[0053] Based on Example 2, the flow field distributions of the two oil products were simulated under more temperature conditions, and 5 of them were selected for illustration. The velocity distribution curve of engine oil at different temperatures is as follows: Figure 6 As shown, the velocity distribution curves of glycerol at different temperatures are as follows Figure 7 shown. It can be seen that the velocity distribution curve of engine oil is obviously different from the peak-type laminar flow curve of glycerol, which is similar to the flat-type laminar flow curve. The flat laminar flow is beneficial for carrying cuttings and stabilizing the borehole wall, which meets the characteristics of engine oil and is also the characteristic required for drilling fluid.

[0054] Further comparison of the flow rate distribution diagrams of engine oil and glycerin shows that the visco...

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Abstract

The invention belongs to the technical field of microfluidic chips, and particularly relates to an experimental facility of using the microfluidic technology to measure fluid viscosity. A constant pressure pump, a microsyringe, a micro-fluidic chip, and a waste liquor collecting system are connected in sequence, and the microsyringe is connected to the micro-fluidic chip through a teflon tube; a temperature-controlling system is connected to a glass-heating platform; a laser light source, a forwardly installed fluorescence microscope and a digital camera are connected in sequence; the digital camera is located above an objective table of the forwardly installed fluorescence microscope; the micro-fluidic chip is put on the glass-heating platform, and the glass-heating platform is put on the objective table of the forwardly installed fluorescence microscope. According to the experimental facility of using the microfluidic technology to measure fluid viscosity, quantitative change laws of the fluid viscosity in a wider temperature range can be obtained. A method is simple and practicable, has a high degree of accuracy, has a wide temperature measuring range, and has low cost, which is suitable for being used as undergraduate teaching experiments in related discipline of hydromechanics.

Description

technical field [0001] The invention belongs to the technical field of microfluidic chips, and in particular relates to an experimental device and method for measuring fluid viscosity using microfluidic technology. Background technique [0002] (Engineering) Fluid Mechanics is one of the basic courses for undergraduates and postgraduates in engineering colleges. There are many experiments in the course of fluid mechanics, and the experimental equipment involved in fluid state discrimination and viscosity measurement is often bulky, low in precision, and difficult to maintain. The introduction of microfluidic chip technology can well solve the above problems. [0003] Microfluidics, also known as Lab-on-a-chip, refers to the size of a chip built on a transparent carrier (such as glass, plastic, etc.) with a small area (about a few square centimeters). Precise chemistry or biology laboratory. It realizes the integration of routine functions in chemical or biological laborato...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N11/04
CPCG01N11/04
Inventor 王晓璞丁廷稷高贝贝龙涛赵欣欣徐加放肯尼斯·斯蒂芬·坎赫力张瑞罗海杨蒙蒙管清杉李德宇李文滔弓正刚
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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