CN100462707C - Double-pipe relative measurement method and device for microflow of liquid - Google Patents

Double-pipe relative measurement method and device for microflow of liquid Download PDF

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Publication number
CN100462707C
CN100462707C CNB2005101145846A CN200510114584A CN100462707C CN 100462707 C CN100462707 C CN 100462707C CN B2005101145846 A CNB2005101145846 A CN B2005101145846A CN 200510114584 A CN200510114584 A CN 200510114584A CN 100462707 C CN100462707 C CN 100462707C
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microchannel
way connection
relative measurement
pressure
liquid
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CN1955707A (en
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崔海航
李战华
刘宗源
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Institute of Mechanics of CAS
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Institute of Mechanics of CAS
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Abstract

A double-tube relative measuring method of liquid micro-flowing includes providing two micro-tube being connected to pressure source, measuring out flow rate Q1 a and Q1 b of the first liquid in two said micro-tubes, providing the second liquid and maintaining its physical parameters to be constant in two micro-tubes test, measuring out flow rate Q 2 a and Q 2 b of the second liquid in two said micro-tubes and then calculating out apparent viscosity coefficient ratio of C = ( Q 1 a / Q 1 b ) / ( Q 2 b / Q 2 b ). The device used for realizing said method is also disclosed.

Description

A kind of two-tube relative measurement method and device of liquid microfluidic
Technical field
The present invention relates to the method and the device of liquid microfluidic characteristic, specifically, relate to eliminate the two-tube relative measurement method of liquid microfluidic and the device of caliber size influence of measurement error.
Background technology
At present, the method for measurement liquid emblem flowing pressure and discharge characteristic mainly contains:
As patent 1: patent No. ZL02285488.6, name is called the low pressure microfluidic experiment table that " a kind of device that is used for measuring liquid viscosity " discloses a kind of gas-powered.
As patent 2: patent No. ZL01279794.4, name is called the high pressure microfluidic experiment table that discloses a kind of liquid driven in " high pressure micro-flow liquid flooding test device ".
Disclosed measurement device precision mainly is subjected to the error effect of caliber in above-mentioned two patents, when the caliber error is 3um, can draw the uncertainty of experimental data up to 13% by known formula.And the error that allows in the measurement of carrying out some liquid microfluidic flow has only 4%, and visible this difference will be submerged in the experimental error.
Patent 3: application number 02148680.8, name is called in " micro liquid viscosity measuring method and device thereof " and discloses a kind of relative measurement method, and it is based on same pipeline, obtains instrument constant with the coefficient of viscosity of normal fluid, with the influence of elimination caliber.In this way to the measurement relative accuracy of liquid viscosity by the absolute method of measurement ± 2.6% reduce to ± 1.8%.
When characteristics such as research microfluidic wall effect, need to measure the flow difference, and other permissible error of this difference in flow is＜(1%～4%) at present, this can't realize under prior art experimental system uncertainty situation.
Therefore, the deficiencies in the prior art require further to reduce the uncertainty of experiment.Under the situation of the measuring accuracy that can't improve caliber at present, people wish the two-tube relative measurement method and the device of a kind of degree of accuracy height, simple liquid microfluidic, reduce the influence of the different operating mode down-off errors of absolute method of measurement.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of two-tube relative measurement method and device of liquid microfluidic is provided, thereby improve the measuring accuracy of liquid microfluidic relative discharge.
In order to achieve the above object, the present invention takes following technical scheme:
A kind of two-tube relative measurement method of liquid microfluidic comprises the steps:
1) provides the first microchannel a and the second microchannel b;
2) low pressure or high-pressure source are linked to each other with above-mentioned two microchannels; Described low pressure is meant 0MPa～1MPa, and described high pressure is meant 1MPa～40MPa;
3) measure the flow Q of first liquid in above-mentioned first microchannel and second microchannel respectively A1, Q B1Expression, and in measuring process, make the pressure of two microchannels, temperature identical;
4) provide a kind of second liquid, keep constant when its physical parameter is tested in above-mentioned two microchannels;
5) measure the flow Q of second liquid in above-mentioned first microchannel and second microchannel respectively A2, Q B2Expression, and in measuring process, make the pressure of two microchannels, temperature identical;
6) eliminate the difference of caliber by throughput ratio, and calculate corresponding apparent viscosity coefficient ratio ξ = Q a 1 / Q b 1 Q a 2 / Q b 2 .
In technique scheme, step 3) and 5) measuring flow adopts displacement method or scales/electronic balance weighing method to carry out.
In technique scheme, the internal diameter of described microchannel is 10um～50um.
A kind of two-tube relative measurement device of liquid microfluidic comprises:
One pressure source 1 provides pressure for liquid flows in microchannel;
One fluid reservoir 2 is communicated with described pressure source 1;
One feed liquor valve 3, this feed liquor valve 3, described pressure source 1 are communicated with described fluid reservoir 2 by first four-way connection 4 that is positioned at fluid reservoir 2 upper ends, and this first four-way connection 4 also is connected with a pressure transducer 5;
One first three-way connection 6 is connected the lower end of described fluid reservoir 2, and two openings in addition of this three-way connection 6 connect a tapping valve 7 and one second three-way connection 8 respectively;
One first microchannel 9 and one second microchannel 10 respectively with two open communication of described second three-way connection 8;
One first flow meter 11 is connected with the other end of described first microchannel 9 and described second microchannel 10 respectively with one second flowmeter 12, and described flowmeter 11 and 12 is used for measuring the flow of liquid in the corresponding microchannel;
In technique scheme, as shown in Figure 1 in the frame of broken lines, can also comprise that one second four-way connection 13 is connected between described first three-way connection 6 and described second three-way connection 8, on two openings of this second four-way connection 13, connect a pressure transducer 14 and a temperature sensor 15 respectively, described pressure transducer 14 is used to measure the inlet pressure of microchannel 9 and microchannel 10, and described temperature sensor 15 is used to measure the temperature in of microchannel 9 and microchannel 10.
In technique scheme, the volume of described fluid reservoir 2 is 10ml～50ml.
In technique scheme, described pressure source 1 adopts compressed air tank.
In technique scheme, described flowmeter adopts photoelectricity flowmeter or scales/electronic balance weighing flowmeter.
In technique scheme, the internal diameter of described microchannel is 10um～50um.
With respect to prior art, the invention has the advantages that:
1) eliminated the geometric error influence of the caliber size that brings main error, can measure, improved relative accuracy the tiny flow quantity difference;
2) to testing two-tube inlet pressure, temperature synchro measure, guarantee that experimental situation is identical, the precision of repeatedly measuring than single tube is higher.
Description of drawings
Fig. 1 represents the structural representation of apparatus of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail:
Measuring principle of the present invention is as follows:
To measure water wall effect in microchannel is example.With two capillary microchannel a, b arranged side by side as experimental subjects, one of them, inside surface such as a pipe has carried out the processing of OTS molecular film, become hydrophobic surface, another capillary microchannel b inside pipe wall does not then deal with, make two capillary microtubules under uniform pressure and temperature, carry out the flow characteristics test of water, can obtain:
Q a - water = π d a 4 P 128 μ water L a ;
Q b - water = π d b 4 P 128 ξ μ water L b ;
In the formula, Q A-waterThe volumetric flow rate of water in the expression a pipe;
Q B-waterThe volumetric flow rate of water in the expression b pipe;
d aExpression a bore;
d bExpression b bore;
L aExpression a length of tube;
L bExpression b length of tube;
P represents the pressure differential at microchannel two ends;
ξ represents apparent viscosity coefficient ratio;
μ WaterThe viscosity coefficient of expression water.
Aforementioned water flow formula in two microchannels is compared, then:
Q a - water Q b - water = d a 4 L b d b 4 L a · ξ
Change test medium, adopt isopropyl alcohol to repeat above-mentioned experiment.Because being isopropyl alcohol, a, b two microchannel inwalls soak into the surface, so the flow in two microchannels is:
Q a - tsop = π d a 4 P 128 μ tsop L a ;
Q a - tsop = π d b 4 P 128 μ tsop L b ;
Above-mentioned two formulas are compared, then:
Q a - tsop Q b - tsop = d a 4 L b d b 4 L a ;
The purpose that isopropyl alcohol is experimentized is to determine a, the difference on the b two microchannel physical dimensions.From above-mentioned formula as can be seen:
ξ = Q a - water / Q b - water Q a - tsop / Q b - tsop
So hydrophobic wall to the influence of flow characteristics, can be summed up as the measurement of above-mentioned four volumetric flow rates.
Can obtain by known error analysis means,, therefore adopt relative measurement method provided by the invention that error is reduced greatly owing to eliminated the item relevant in the following formula with caliber.
To measure liquid microfluidic wall effect is example, and then the two-tube relative measurement method of liquid microfluidic specifically comprises the steps:
1, provide two microchannel a, b, prepare hydrophobic surface at the inwall of a microchannel a or b, another microchannel b or a do not deal with; The internal diameter of two pipelines is 20um, and length is 10cm;
2, connect the experiment pipeline, a low pressure source is linked to each other with two microchannels; Pressure source pressure is 0.2MPa; In general, depress when experimentizing, require the pressure in low pressure source to be greater than a standard atmospheric pressure at a normal atmosphere, and less than 1MPa; Pressure is 0.2MPa in the present embodiment;
3, adopt the scales/electronic balance weighing method to measure the flow Q of water in two microchannels A-water, Q B-water, and guarantee pressure, the temperature unanimity of two microchannels in the measuring process;
4, adopt the scales/electronic balance weighing method to measure the flow Q of isopropyl alcohol at above-mentioned two microchannels A-tsop, Q B-tsopAnd pressure, the temperature unanimity of two microchannels in the assurance measuring process;
5, eliminate the difference of caliber by throughput ratio, and calculate corresponding apparent viscosity coefficient ratio ξ = Q a - water / Q b - water Q a - tsop / Q b - tsop .
The two-tube relative measurement device of liquid microfluidic wall effect comprises:
One pressure source 1 provides pressure for liquid flows in microchannel, adopt compressed air tank as pressure source;
One fluid reservoir 2 is communicated with described pressure source 1, and volume is 30ml, is used to store experimental liquid;
One feed liquor valve 3, this feed liquor valve 3, described pressure source 1 are communicated with described fluid reservoir 2 by first four-way connection 4 that is positioned at fluid reservoir 2 upper ends, and this first four-way connection 4 also is connected with a pressure transducer 5;
One first three-way connection 6 is connected the lower end of described fluid reservoir 2, and two openings in addition of this three-way connection 6 connect a tapping valve 7 and one second three-way connection 8 respectively;
One first microchannel 9 and one second microchannel 10 respectively with two open communication of described second three-way connection 8, wherein first microchannel, 9 inwalls have carried out the hydrophobic molecule film and have handled;
One first flow meter 11 is connected with the other end of described first microchannel 9 and described second microchannel 10 respectively with one second flowmeter 12, first and second flowmeters of present embodiment adopt the applicant's patent 4: patent No. ZL02256879.4, name is called disclosed flowmeter, i.e. photoelectricity flowmeter in " a kind of liquid micrometeor apparatus for automatically measuring ";
Comprise that also one second four-way connection 13 is connected between described first three-way connection 6 and described second three-way connection 8, on two openings of this second four-way connection 13, connect a pressure transducer 14 and a temperature sensor 15 respectively, described pressure transducer 14 is used to measure the inlet pressure of microchannel 9 and 10, and described temperature sensor 15 is used to measure the temperature in of microchannel 9 and 10.
Each parts in the present embodiment, except that special declaration, the conventional components that all adopts market to sell is as associated line between pressure transducer, temperature sensor, three-way connection, four-way connection, valve and the parts etc.
It should be noted last that above embodiment is only unrestricted in order to technical scheme of the present invention to be described.Although the present invention is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is made amendment or is equal to replacement, and do not break away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (10)

1, a kind of two-tube relative measurement method of liquid microfluidic comprises the steps:
1) provides first microchannel and second microchannel;
2) low pressure or high-pressure source are linked to each other with above-mentioned two microchannels; Described low pressure is meant 0MPa～1MPa, and described high pressure is meant 1MPa～40MPa;
3) measure the flow Q of water in above-mentioned first microchannel and second microchannel respectively A1, Q B1Represent, and in measuring process, make pressure, the temperature unanimity of two microchannels;
4) provide a kind of isopropyl alcohol, keep constant when its physical parameter is tested in above-mentioned two microchannels;
5) measure the flow Q of isopropyl alcohol in above-mentioned first microchannel and second microchannel respectively A2, Q B2Represent, and in measuring process, make pressure, the temperature unanimity of two microchannels;
6) by the difference of throughput ratio elimination caliber, calculate corresponding apparent viscosity coefficient ratio according to following formula:
ξ = Q a 1 / Q b 1 Q a 2 / Q b 2 .
2, according to the two-tube relative measurement method of the described liquid microfluidic of claim 1, it is characterized in that described step 3) and 5) middle flow employing displacement method or the scales/electronic balance weighing method measured.
According to the two-tube relative measurement method of claim 1 or 2 described liquid microfluidic, it is characterized in that 3, the internal diameter of described microchannel is 10um～50um.
4, a kind of two-tube relative measurement device of liquid microfluidic comprises:
One pressure source (1) provides pressure for liquid flows in microchannel;
One fluid reservoir (2) is communicated with described pressure source (1);
One feed liquor valve (3), this feed liquor valve (3), described pressure source (1) are communicated with described fluid reservoir (2) by first four-way connection (4) that is positioned at fluid reservoir (2) upper end, and this first four-way connection (4) also is connected with a pressure transducer (5);
One first three-way connection (6) is connected the lower end of described fluid reservoir (2), and two openings in addition of this three-way connection (6) connect a tapping valve (7) and one second three-way connection (8) respectively;
It is characterized in that, also comprise:
One first microchannel (9) and one second microchannel (10) respectively with two open communication of described second three-way connection (8);
One first flow meter (11) is connected with the other end of described first microchannel (9) with described second microchannel (10) respectively with one second flowmeter (12), and described first flow meter (11) and second flowmeter (12) are used for measuring the flow of liquid in the corresponding microchannel.
5, according to the two-tube relative measurement device of the described liquid microfluidic of claim 4, it is characterized in that, comprise that also one second four-way connection (13) is connected between described first three-way connection (6) and described second three-way connection (8), on two openings of this second four-way connection (13), connect the temperature sensor (15) that a pressure transducer (14) and that is used to measure the inlet pressure of first microchannel (9) and second microchannel (10) is used to measure the temperature in of first microchannel (9) and second microchannel (10) respectively.
According to the two-tube relative measurement device of the described liquid microfluidic of claim 4, it is characterized in that 6, the volume of described fluid reservoir (2) is 10ml～50ml.
According to the two-tube relative measurement device of the described liquid microfluidic of claim 4, it is characterized in that 7, the internal diameter of described first microchannel (9) and second microchannel (10) is 10um～50um.
According to the two-tube relative measurement device of the described liquid microfluidic of claim 4, it is characterized in that 8, described pressure source (1) adopts compressed air tank.
According to the two-tube relative measurement device of the described liquid microfluidic of claim 4, it is characterized in that 9, described flowmeter adopts photoelectricity flowmeter or scales/electronic balance weighing flowmeter.
10, according to claim 5,6, the 8 or 9 two-tube relative measurement device of any described liquid microfluidic wherein, it is characterized in that the internal diameter of described microchannel is 10um～50um.
CNB2005101145846A 2005-10-26 2005-10-26 Double-pipe relative measurement method and device for microflow of liquid Expired - Fee Related CN100462707C (en)

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CN104764503B (en) * 2015-04-09 2018-04-27 中国石油大学(北京) Fluid micro-flux self-measuring device
CN104764500B (en) * 2015-04-09 2018-04-17 中国石油大学(北京) Laser micrometeor gauge

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2515441Y (en) * 2001-12-30 2002-10-09 中国科学院力学研究所 Experimental facility for testing high pressure trace liquid flow property
CN2578817Y (en) * 2002-11-20 2003-10-08 中国科学院力学研究所 Liquid viscosity measuring devices
CN1501061A (en) * 2002-11-15 2004-06-02 中国科学院力学研究所 Trace amount liquid viscosity measuring method and apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2515441Y (en) * 2001-12-30 2002-10-09 中国科学院力学研究所 Experimental facility for testing high pressure trace liquid flow property
CN1501061A (en) * 2002-11-15 2004-06-02 中国科学院力学研究所 Trace amount liquid viscosity measuring method and apparatus
CN2578817Y (en) * 2002-11-20 2003-10-08 中国科学院力学研究所 Liquid viscosity measuring devices

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