CN106370559B - Using the experimental provision and experimental method of microflow control technique measurement fluid viscosity - Google Patents
Using the experimental provision and experimental method of microflow control technique measurement fluid viscosity Download PDFInfo
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- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/02—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material
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Abstract
The invention belongs to micro fluidic chip technical field, more particularly to the experimental provision of application microflow control technique measurement fluid viscosity, constant pressure pump, microsyringe, micro-fluidic chip, waste collection system are sequentially connected, and the microsyringe is connected by teflon pipe with micro-fluidic chip；The temperature control system is connected with glass heating platform；Laser light source, just putting fluorescence microscope, digital camera is sequentially connected；Digital camera is located above the objective table for just putting fluorescence microscope；The micro-fluidic chip is placed on glass heating platform, and glass heating platform, which is positioned over, just to be put on fluorescence microscope objective table.The present invention can obtain the quantitative changing rule of fluid viscosity in large temperature range.This method simple possible, accuracy is high, measurement temperature scope is wide, cost is low, is suitable as the undergraduate course experiment of hydrodynamics related discipline.
Description
Technical field
The invention belongs to micro fluidic chip technical field, and in particular to a kind of to measure fluid viscosity using microflow control technique
Experimental provision and method.
Background technology
(engineering) hydrodynamics is one of core curriculum of engineering and polytechnic universities undergraduate, postgraduate.Exersices of Hydrodynamics Course is tested
More, the experimental facilities that is related to flow pattern discrimination, viscosity measurement etc. is often bulky, precision is not high, easy care, introduces not micro-
Fluidic chip technology can then solve the problems, such as the several aspects of the above well.
Micro-fluidic chip (Microfluidics) is also known as chip lab (Lab-on-a-chip), refers in one piece of face
The accurate in size chemistry built on the transparent carrier (such as glass, plastics) of product very little (about several square centimeters) or Bioexperiment
Room.It realizes the integrated of chemistry or biology laboratory conventional func, have high sensitivity, high accuracy, transparent visual, it is low into
This features such as, be a kind of emerging analysis detection means.It is external by microflow control technique be incorporated into chemistry, biology, medicine,
The every field such as environment, and be allowed to played an important role.The microfluidic chip technology in China is started late, but is developed very
It hurry up, as the application of Lin Ping Cheng, Wang Liding, Fang Zhaolun et al. all for China's microflow control technique provides good theoretical direction and shows
Sincere justice.
In petroleum works field, be involved in the problems, such as that fluid is very much, such as from liquid form analysis include oil gas water seepage flow,
Guan Liu, Annular cutting etc., flow regime include laminar flow, turbulent flow, slug flow etc..At present, the conventional teaching research means of these problems
It is extremely limited, and time-consuming consumptive material, precision be not high, and microflow control technique then for these problems teaching and research provide it is new can
Energy.
Viscosity refers to the caused resistance to deformation when relative motion occurs for fluid micellar, hinders the property of its relative motion
Matter, is the base attribute that fluid has.And the size of the true viscosity of dynamic viscosity μ reflection fluids, with type of fluid and temperature
Spend related, wherein influence of the temperature to viscosity is than more significant.
Therefore, understand that the affecting laws of temperature convection body viscosity are not only the application of this specialized core course of Fluid Mechanics
It is even more one of important learning Content of the specialty such as petroleum works, marine oil and gas engineering, oil-gas gathering and transportation engineering with supplement.By this
Experimental system grasps temperature and the relation of fluid viscosity, it will to understanding that Annular cutting, seepage flow, deepwater drilling liquid design etc. are provided with
The support and help of power.
The content of the invention
It is an object of the invention to propose a kind of experimental provision and method using microflow control technique measurement fluid viscosity, with
The experimental facilities that solves the experiment of current Exersices of Hydrodynamics Course is bulky, precision is not high, not easy care the problems such as.
Using the experimental provision of microflow control technique measurement fluid viscosity, including constant pressure pump, microsyringe, micro-fluidic core
Piece, temperature control system, glass heating platform, laser light source, just putting fluorescence microscope, digital camera, waste collection system；It is described
Constant pressure pump, microsyringe, micro-fluidic chip, waste collection system be sequentially connected, the microsyringe passes through Teflon
Dragon pipe is connected with micro-fluidic chip；The temperature control system is connected with glass heating platform；Laser light source, just put fluorescence microscopy
Mirror, digital camera are sequentially connected；Digital camera is located above the objective table for just putting fluorescence microscope；The micro-fluidic core
Piece is placed on glass heating platform, and glass heating platform, which is positioned over, just to be put on fluorescence microscope objective table.
Wherein, the body layer of the micro-fluidic chip is dimethyl silicone polymer polymer material layer, and bottom surface carrier is
Glass；Include channel configurations in the body layer of micro-fluidic chip, channel configurations are single straight channel, and single straight-through road width is 450~470
μm, a height of 40~50 μm.Preferably, the microchannel width of the micro-fluidic chip is 460.5 μm, a height of 44.2 μm.
Specifically, the selection temperature range of temperature control system and the glass heating platform is 298K~348K.
Specifically, the relevant parameter of digital camera is：Aperture F3.2, ISO100, sensitivity 80, time for exposure 1s.
This measures the experimental method of the experimental provision of fluid viscosity, including procedure below using microflow control technique：
(1), fluorescent grain is uniformly dispersed in fluid to be measured sample, the sample suction containing fluorescent grain is micro
Injector；
(2), by adjusting constant pressure pump panel parameter, fluid sample is injected into micro-fluidic chip and keeps injection state；
(3), constant pressure pump is opened to micro-fluidic chip injected sample, is made sample full of micro-fluidic chip passage and is flowed out a little
Afterwards, pause injection；
(4), just putting fluorescence microscope and choosing suitable micro objective, and the visual field under eyepiece is led to for micro-fluidic chip
Road stage casing；
(5), adjustment digital camera focal length is allowed to focus on micro-fluidic chip passage；
(6), target temperature is set by temperature control system, glass heating platform is reached design temperature, and stand 10 minutes；
(7), constant pressure pump is opened to micro-fluidic chip injected sample, it was observed that after flowing is stablized, when adjusting and recording exposure
Between, start to take pictures, number of pictures is 10；
(8), the length of each trace in photo, divided by time for exposure are measured, obtains the fluid stream in micro-fluidic chip pipeline
Speed distribution；
(9), velocity flow profile data and pressure difference parameter are brought into N-S equations and continuity equation, so as to obtain at this temperature
Fluid viscosity.
Wherein, the fluorescent grain described in step (1), particle diameter are 1 μm.
Fluid to be measured sample described in step (1) includes deionized water, machine oil, glycerine.
The invention has the advantages that and effect：
The present invention can obtain the quantitative changing rule of fluid viscosity in large temperature range.This method simple possible, standard
Exactness is high, measurement temperature scope is wide, cost is low, is suitable as the undergraduate course experiment of hydrodynamics related discipline.
Brief description of the drawings
Fig. 1 is the structure diagram of the present invention；
Fig. 2 is the microfluidic chip structure schematic diagram of the present invention；
Fig. 3 is that the Flow Field Distribution of embodiment 298K deionised waters and analog result contrast；
Fig. 4 contrasts for Flow Field Distribution of the embodiment machine oil under 298K and 348K and analog result；
Fig. 5 contrasts for Flow Field Distribution of the embodiment glycerine under 298K and 348K and analog result；
Fig. 6 is machine oil flow rate profiles figure under embodiment different temperatures；
Fig. 7 is Glycerol flow rates scatter chart under embodiment different temperatures；
Fig. 8 is engine oil viscosity change curve under embodiment different temperatures；
Fig. 9 is glycerine viscosity change curve map under embodiment different temperatures.
Embodiment
It is described in conjunction with the embodiments the embodiment of the present invention.
As shown in Figure 1, using the experimental provision of microflow control technique measurement fluid viscosity, including constant pressure pump 1, microsyringe
2nd, micro-fluidic chip 3, temperature control system 4, glass heating platform 5, laser light source 6, just putting fluorescence microscope 7, digital camera 8,
Waste collection system 9；The constant pressure pump 1, microsyringe 2, micro-fluidic chip 3, waste collection system 9 are sequentially connected, institute
The microsyringe 2 stated is connected by teflon pipe with micro-fluidic chip 3；The temperature control system 4 connects with glass heating platform 5
Connect；Laser light source 6, just putting fluorescence microscope 7, digital camera 8 is sequentially connected；Digital camera 8, which is located at, just puts fluorescence microscopy
Above the objective table of mirror 7；The micro-fluidic chip 3 is placed on glass heating platform 5, and glass heating platform 5 is positioned over just
Put on 7 objective table of fluorescence microscope.
As Fig. 2 shows, the body layer of the micro-fluidic chip 3 is dimethyl silicone polymer polymer material layer, and bottom surface carries
Body is glass；Include channel configurations in the body layer of micro-fluidic chip 3, channel configurations are single straight channel, and single straight-through road width is 450
~470 μm, a height of 40~50 μm.Preferably, the microchannel width of the micro-fluidic chip 3 is 460.5 μm, a height of 44.2 μm.
Specifically, the selection temperature range of the temperature control system 4 and glass heating platform 5 is 298K~348K.
Specifically, the relevant parameter of digital camera 8 is：Aperture F3.2, ISO100, sensitivity 80, time for exposure 1s.
Embodiment 1：The feasibility of deionized water confirmatory experiment
(1) for the feasibility of confirmatory experiment, tested first against deionized water, directly use fluorescent grain solution
Tested as sample, it is appropriate to enter fluorescent grain solution with microsyringe 2, and microsyringe 2 then is located at constant pressure pump
1, after setting relevant parameter on 1 plate of constant pressure pump, you can start to inject sample；
(2) constant pressure pump 1 is opened to 3 injected sample of micro-fluidic chip, and sample full of 3 passage of micro-fluidic chip and is flowed out few
Xu Hou, pause injection, starts adjustment and is just putting fluorescence microscope 7 afterwards, and it is in 3 passage of micro-fluidic chip to make the visual field under eyepiece
Section, and size is appropriate, digital camera 8 is connected with just putting fluorescence microscope 7, and adjust focal length；
(3) it is 298K to set temperature control console temperature, after temperature reaches design temperature, opens constant pressure pump 1, it was observed that flowing
After stabilization, start to take pictures, number of pictures can be determined according to actual effect, but should not be less than 5；
(4) after collection of photos, quantitative analysis is carried out using image analysis software, so as to obtain specified temp and specific flow velocity
Under deionized water Flow Field Distribution, as shown in Figure 3.
From the figure 3, it may be seen that meet the throwing of pipe laminar flow economics analysis solution as the Flow Field Distribution obtained by fluorescent grain trace analysis
Thing line form, and flow velocity is maximum at pipe axis, practical flow field distribution coincide substantially with analog result.Gained is fitted by experimental result
74.84 μm/s of mean flow rate with experiment setting 75 μm/s of mean flow rate it is consistent, thus calculate gained water dynamic viscosity μ
(0.8985cP) is all consistent with tabling look-up and simulating value used, and it is accurately feasible to represent experimental program.
Embodiment 2：The flow observation and simplation verification of oil phase
Oil phase used is respectively machine oil and glycerine.COMSOL Multiphysics simulation softwards are selected to be verified.
After fluorescent grain surface carries out hydrophobicity processing, add oil phase to indicate its Flow Field Distribution, concrete operation step with
In embodiment 1 as the observation of water phase, inlet pressure control is 1.5 atmospheric pressure.And after completing one group of observation, by temperature control system
4 temperature is adjusted to 348K, treats that system stabilization repeats measuring process.It can obtain the Flow Field Distribution of machine oil and glycerine
Situation such as Fig. 4 and Fig. 5.
As shown in Figure 4, under constant-pressure conditions, machine oil flow field can be measured by experimental observation, its power can be obtained by fitting
Viscosity is 574cP in 298K, and dynamic viscosity is reduced to 28cP when being warming up to 348K, it is seen that temperature influences dynamic viscosity aobvious
Write, and two groups of experimental datas all match with simulation curve；
By Fig. 5, the dynamic viscosity that can similarly obtain glycerine is 995cP in 298K, and when 384K is 24cP, and two groups of experiment numbers
According to all matching with simulation curve.
Comparison diagram 4 and Fig. 5, temperature rise all play the role of viscosity reduction, and fluid flow fields significant difference under different temperatures,
And fitting viscosity is coincide with reference value, illustrates the measuring fluid viscosity accurate and effective, and can the factor such as quantitative analysis temperature
Influence to rheological characteristic.
Embodiment 3：Temperature is fitted oil phase flow and viscosity results
Based on embodiment 2, the Flow Field Distribution of two kinds of oil products is simulated under more temperature conditionss, and chooses
Wherein 5 mappings are to illustrate.Machine oil velocity distribution curve at different temperatures as shown in fig. 6, glycerine in different temperatures
Under velocity distribution curve it is as shown in Figure 7.As can be seen that the velocity distribution curve of machine oil is clearly distinguishable from the spike type layer of glycerine
Flow curve, is approximately plate laminar flow curve.Plate laminar flow is conducive to cutting carring and wellbore stability, the characteristics of meeting machine oil
It is required that the and required characteristic of drilling fluid.
Further contrasting machine oil and the velocity profile of glycerine can obtain, in the range of temperature of 273K to 373K, machine
The viscosity of oil constantly reduces, and since 323K just no longer with the rise of temperature obvious change occurs for the viscosity of glycerine.
By the fluid viscosity under the theoretical extraction different temperatures of pipe laminar flow, then dynamic viscosity change curve, such as Fig. 8 can be obtained
Shown in Fig. 9.And be fitted using Arrhenius formula, as a result respectively as shown in formula (1) and (2).
μ=4.75549 × 10-10e51814.51426/(8.31451×T) (1)
μ=5.74611 × 10-12e64116.38228/(8.31451×T) (2)
In formula：μ be fluid dynamic viscosity, Pas；T is temperature, K.
From Fig. 8 and 9 as can be seen that as the reduction of temperature, the dynamic viscosity of two kinds of oil products all increase.Particularly low
When 300K, fluid viscosity is influenced by temperature very big, viscosity with temperature reduction exponentially property growth；To fluid when temperature is higher
Viscosity influence be not apparent.This also absolutely proves that rheological property influence of the low temperature on fluid is big, low temperature rheological behaviour
Regulation and control are that deepwater drilling liquid has to one of problem for capturing.By this experiment, students can be made from actual and theoretical two sides
The understanding of deeper is obtained in face of this problem；Meanwhile " constant current change " drilling well system can also be carried out by this experimental system
Design and verification.
Claims (5)
1. the experimental provision of application microflow control technique measurement fluid viscosity, it is characterised in that including constant pressure pump (1), micro-sampling
Device (2), micro-fluidic chip (3), temperature control system (4), glass heating platform (5), laser light source (6), just put fluorescence microscope
(7), digital camera (8), waste collection system (9)；The constant pressure pump (1), microsyringe (2), micro-fluidic chip
(3), waste collection system (9) is sequentially connected, and the microsyringe (2) is connected by teflon pipe and micro-fluidic chip (3)
Connect；The temperature control system (4) is connected with glass heating platform (5)；Laser light source (6), just putting fluorescence microscope (7), be digital
Camera (8) is sequentially connected；Digital camera (8) is located above the objective table for just putting fluorescence microscope (7)；Described is micro-fluidic
Chip (3) is placed on glass heating platform (5), and glass heating platform (5), which is positioned over, just puts fluorescence microscope (7) objective table
On.
2. the experimental provision according to claim 1 using microflow control technique measurement fluid viscosity, it is characterised in that described
The body layer of micro-fluidic chip (3) be dimethyl silicone polymer polymer material layer, bottom surface carrier is glass；Micro-fluidic chip
(3) including channel configurations in body layer, channel configurations are single straight channel, and single straight-through road width is 450~470 μm, a height of 40~
50μm。
3. the experimental method of the experimental provision according to claim 1 or 2 using microflow control technique measurement fluid viscosity, its
It is characterized in that, including procedure below：
(1), fluorescent grain is uniformly dispersed in fluid to be measured sample, the sample containing fluorescent grain is sucked into micro-sampling
Device (2)；
(2), by adjusting constant pressure pump (1) panel parameter, by fluid sample injection micro-fluidic chip (3) and injection state is kept；
(3), constant pressure pump (1) is opened to micro-fluidic chip (3) injected sample, sample is full of micro-fluidic chip (3) passage cocurrent
After going out a little, pause injection；
(4), just putting fluorescence microscope (7) and choosing suitable micro objective, and making the visual field under eyepiece be micro-fluidic chip (3)
Passage stage casing；
(5), adjustment digital camera (8) focal length is allowed to focus on micro-fluidic chip (3) passage；
(6), target temperature is set by temperature control system (4), glass heating platform (5) is reached design temperature, and stand 10 points
Clock；
(7), constant pressure pump (1) is opened to micro-fluidic chip (3) injected sample, it was observed that after flowing is stablized, is adjusted and is recorded exposure
Time, starts to take pictures, and number of pictures is 10；
(8), the length of each trace in photo, divided by time for exposure are measured, obtains the fluid flow rate in micro-fluidic chip (3) pipeline
Distribution；
(9), velocity flow profile data and pressure difference parameter are brought into N-S equations and continuity equation, so as to obtain stream at this temperature
Body viscosity.
4. the experimental method of the experimental provision according to claim 3 using microflow control technique measurement fluid viscosity, it is special
Sign is that the fluorescent grain described in step (1), particle diameter is 1 μm.
5. the experimental method of the experimental provision according to claim 3 using microflow control technique measurement fluid viscosity, it is special
Sign is that the fluid to be measured sample described in step (1) includes deionized water, machine oil, glycerine.
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Inventor after: Wang Xiaopu Inventor after: Yang Mengmeng Inventor after: Guan Qingshan Inventor after: Li Deyu Inventor after: Li Wentao Inventor after: Gong Zhenggang Inventor after: Ding Tingji Inventor after: Gao Beibei Inventor after: Long Tao Inventor after: Zhao Xinxin Inventor after: Xu Jiafang Inventor after: Kenneth Stephen Kangeli Inventor after: Zhang Rui Inventor after: Luo Hai Inventor before: Wang Xiaopu Inventor before: Ding Tingji Inventor before: Long Tao Inventor before: Zhao Xinxin Inventor before: Xu Jiafang Inventor before: Kenneth Stephen Kangeli Inventor before: Yang Mengmeng Inventor before: Zhang Rui Inventor before: Luo Hai |
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