CN106769689A - The measurement apparatus and method of gas diffusion coefficient in a liquid under a kind of variable volume constant pressure - Google Patents
The measurement apparatus and method of gas diffusion coefficient in a liquid under a kind of variable volume constant pressure Download PDFInfo
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- CN106769689A CN106769689A CN201710007459.8A CN201710007459A CN106769689A CN 106769689 A CN106769689 A CN 106769689A CN 201710007459 A CN201710007459 A CN 201710007459A CN 106769689 A CN106769689 A CN 106769689A
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- 238000009792 diffusion process Methods 0.000 title claims abstract description 150
- 239000007788 liquid Substances 0.000 title claims abstract description 89
- 238000005259 measurement Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000006073 displacement reaction Methods 0.000 claims abstract description 24
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000013480 data collection Methods 0.000 claims description 6
- 230000033001 locomotion Effects 0.000 claims description 6
- 230000000740 bleeding effect Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 230000033228 biological regulation Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000004090 dissolution Methods 0.000 claims description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract description 6
- 230000000007 visual effect Effects 0.000 abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052697 platinum Inorganic materials 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract 1
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 77
- 238000007789 sealing Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000002296 dynamic light scattering Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
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- 229920006395 saturated elastomer Polymers 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N2013/003—Diffusion; diffusivity between liquids
Abstract
The invention discloses the measurement apparatus and method of a kind of diffusion coefficient in a liquid of gas under variable volume constant pressure, device mainly includes gaseous sample bottle, air chamber, diffusion chamber, thermostat, valve, vavuum pump, pressure-reducing valve, pressure control gas cylinder, displacement transducer, pressure sensor, platinum resistance thermometer, data collecting system.The diffusion chamber is using the visual window construction with quartz glass；The diffusion chamber is provided with pressure sensor and displacement transducer；The diffusion chamber keeps its pressure in diffusion process constant by moveable piston with pressure control gas cylinder；Displacement of the moveable piston in measurement process is obtained by displacement sensor.Gas diffusion coefficient in a liquid is calculated according to Fick second laws.The present invention realizes the measurement of the diffusion coefficient in a liquid of gas under constant pressure, has the advantages that simple device, low cost, easy to operate, system stabilization.
Description
Technical field
The invention belongs to Chemical Engineering and fluid thermophysical property measurement field, and in particular to gas exists under a kind of variable volume constant pressure
The measurement apparatus and method of diffusion coefficient in liquid.
Background technology
Diffusion coefficient as fluid one of three big transport properties, be the basis of Study of Fluid molecular motion and transport phenomenon
Parameter, for example it is the mixing and separation process of solution, the restrictive factor of chemical reaction.Expand in a liquid for gas at present
The measuring method report for dissipating coefficient is more, mainly includes：Pressure-decay method, gravity sedimentation balance method, time-delay method, dynamic light scattering
Method, real-time concentration mensuration etc..Wherein pressure-decay method is most widely used, it mainly by measuring constant volume under gas exist
Pressure obtains diffusion coefficient with the variation relation of time in liquid diffusion process, and the method experimental provision is simple, and cost is relatively low, behaviour
Facilitate.However, under constant volume, pressure in diffusion chamber is constantly reduced with the dissolving of gas, and this method is difficult
Measure the diffusion coefficient under certain constant pressure.
The content of the invention
It is an object of the invention to provide gas under a kind of variable volume constant pressure in a liquid the measurement apparatus of diffusion coefficient and
Method, solving pressure-decay method can not measure the defect of the diffusion coefficient in a liquid of gas under constant pressure.
To achieve these goals, present invention employs following technical scheme：
A kind of measurement apparatus of gas diffusion coefficient in a liquid under variable volume constant pressure, the device includes air chamber, diffusion
Chamber, thermostat and pressure control gas cylinder, the air chamber and diffusion chamber are arranged in thermostat, are provided with for examining in air chamber
The first pressure sensor of gas cavity pressure is surveyed, the piston that can be moved up and down in limited range is provided with diffusion chamber, it is living
Diffusion chamber is divided into the upper chamber more than piston and the lower chambers two parts below piston by plug, and pressure control gas cylinder leads to
The pipeline with pressure-reducing valve is crossed to be connected with the upper chamber of diffusion chamber, be provided with diffusion chamber for detect cavity of resorption chamber pressure second
Pressure sensor and the displacement transducer for detecting piston position change, air chamber is by the pipeline with sampling valve and expansion
The lower chambers for dissipating chamber are connected.
Be provided with change for observing testing liquid liquid level position and gas diffusion process on the diffusion chamber can
Form.
Upper bracket and lower carriage are provided with the diffusion chamber, the movement of the piston is limited between upper and lower bracket.
Described device also includes the first valve, the second valve, the 3rd valve, air bleeding valve, vavuum pump and gaseous sample bottle,
3rd valve is connected with air chamber, and the second valve is arranged on the connecting line of vavuum pump and the 3rd valve, and the first valve is set
In on gaseous sample connecting line of the bottle with the 3rd valve, air bleeding valve is upper with diffusion chamber by the pipeline with pressure-reducing valve
Chamber is connected.
Described device also includes data collection and transmission, first, second pressure sensor, displacement transducer and use
It is connected with data collection and transmission respectively in the thermometer of detection thermostat temperature.
The piston position that the data collection and transmission is gathered according to the process of gas diffusion under constant temperature and pressure to liquid
The space average concentration for calculating that gas does not spread in a liquid in the same time is moved, then to solving what is obtained according to Fick second theorems
Space average concentration equation carries out nonlinear fitting, obtains gas diffusion coefficient in a liquid.
Based on said apparatus, the invention allows for a kind of measurement of the diffusion coefficient in a liquid of gas under variable volume constant pressure
Method, comprises the following steps：
1) it is part below the testing liquid injection diffusion chamber inner carrier of m by quality, diffusion chamber is then placed in thermostat
In, and be connected with the air chamber in thermostat, treatment then is de-gassed by vacuumizing to the liquid in injection diffusion chamber, together
When piston in diffusion chamber is moved to lower position by vacuumizing；
2) gas in air chamber is injected in the cavity in diffusion chamber between liquid levels and piston, before and after injection
The pressure change of air chamber calculates the mole Δ n of the gas of injection diffusion chamber；
3) stop after injection gas using being vented the pressure of valve regulation diffusion chamber inner carrier above section to goal pressure,
Under conditions of the pressure of diffusion chamber inner carrier above section maintained into goal pressure using pressure-reducing valve and pressure control gas cylinder, gas is recorded
Body in a liquid in diffusion process any time t piston displacement L2, pressure according to part below diffusion chamber inner carrier with
And displacement of the piston at the correspondence moment calculates the mole of the gas in diffusing to liquidAccording toCalculate correspondence moment gas
It is diffused into the space average concentration in liquid<C>；
4) using the space average concentration at multiple moment under the goal pressure being calculated, to being asked according to Fick second theorems
The space average concentration equation that solution is obtained carries out nonlinear fitting, obtains gas diffusion coefficient in a liquid.
It is describedCalculate in such a way：
Vg=VD-V1
VD=VE+πr2(L1-L2)
Wherein, ngIt is the mole of the empty intracavity gas, V1To inject the volume of the liquid of diffusion chamber, VEFor piston is moved
Move the diffusion cavity volume to part below piston during lower position, ρgThe density of empty intracavity gas, M described in the correspondence momentgFor
The molal weight of gas, VDIt is the diffusion cavity volume of part below correspondence moment piston, VgThe body of cavity described in the correspondence moment
Product, r is piston cross-section radius, L1For piston movement to diffusion chamber cavity top displacement sensor during lower position to piston away from
From.
The space average concentration is calculated in such a way：
Wherein, V1To inject the volume of the liquid of diffusion chamber.
The space average concentration equation is expressed as：
Wherein, λn=(n+1/2) π/L；D is diffusion coefficient；T is diffusion time；L is the thickness for spreading intracavity liquid；C0For
Gas initial concentration in a liquid, CSFor constant pressure and at a temperature of gas saturation concentration of ordinary dissolution in a liquid；N is fitting
Item number.
Compared with prior art, beneficial effects of the present invention are embodied in：
The present invention can be adjusted and kept by pressure control gas cylinder and moveable piston to the pressure for spreading intracavity gas
Constant, temperature is constant in keeping diffusion process using thermostat, realizes the measurement of the diffusion coefficient in a liquid of gas under constant pressure.
The liquids and gases amount that the present invention is used is less, and experiment measurement is simple, and required cost is relatively low, easy to operate.
Further, the present invention is by increasing visual window, facilitates look in diffusion chamber liquid level position and gas in liquid
Real-time spread condition in body.
Brief description of the drawings
Fig. 1 is the structural representation of gas diffusion coefficient measurement apparatus in a liquid under variable volume constant pressure；
Fig. 2 is diffusion chamber structural representation；Wherein, (a) is top view, and (b) is side view；
Fig. 3 is diffusion chamber profile；
In figure：1st, gaseous sample bottle；2nd, vavuum pump；3rd, the first valve；4th, the second valve；5th, the 3rd valve；6th, air chamber；
7th, first pressure sensor；8th, the 4th valve；9th, displacement transducer；10th, diffusion chamber；11st, thermostat；12nd, thermometer；13rd, number
According to acquisition system；14th, second pressure sensor；15th, the 5th valve；16th, pressure-reducing valve；17th, pressure control gas cylinder；18th, bolt；19th, it is permanent
Pressurized air source air inlet；20th, displacement transducer mounting interface；21st, diffusion chamber top cover；22nd, visual window；23rd, pressure sensor is installed
Interface；24th, diffusion chamber air inlet；25th, the first sealing ring；26th, quartz glass；27th, upper bracket；28th, the second sealing ring；29th, under
Support；30th, moveable piston.
Specific embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail, and embodiment described herein is only used
In the present invention is explained, it is not intended to limit the present invention.
As shown in figure 1, under a kind of variable volume constant pressure gas diffusion coefficient in a liquid measurement apparatus, the device includes：
Gaseous sample bottle 1, vavuum pump 2, the first valve 3, the second valve 4, the 3rd valve 5, air chamber 6, first pressure sensor 7, the
Four valves 8 (sampling valve), displacement transducer 9, diffusion chamber 10, thermostat 11, platinum resistance thermometer 12, data collecting system 13,
Second pressure sensor 14, the 5th valve 15 (air bleeding valve), pressure-reducing valve 16 and pressure control gas cylinder 17.The air chamber 6 is by carrying
The pipeline of valve and gaseous sample bottle 1 and vavuum pump 2 are connected that (specific connected mode is：3rd valve 5 is connected with air chamber 6, the
Two valves 4 are arranged on the connecting line of the valve 5 of vavuum pump 2 and the 3rd, and the first valve 3 is arranged at gaseous sample bottle 1 and the 3rd
On the connecting line of valve 5), first pressure sensor 7 is installed at the top of air chamber 6.The diffusion chamber 10 is by with the 4th
The pipeline of valve 8 is connected with air chamber 6, and moveable piston 30 is installed in diffusion chamber inside, and the side of the diffusion chamber 10 installs the
Two pressure sensors 14, and displacement transducer 9 is installed at the top of diffusion chamber 10.The air chamber 6 and diffusion chamber 10 are placed in high-precision
Spend in temperature controlled thermostat 11.The temperature of the thermostat 11 is measured by platinum resistance thermometer 12.The pressure control gas cylinder
17 are connected by the pipeline with pressure-reducing valve 16 with diffusion chamber 10.5th valve 15 is connected with the pipeline.In the air chamber 6
Pressure and the pressure of the outlet of pressure-reducing valve 16 are measured by first pressure sensor 7 and second pressure sensor 14 and obtained.The number
Include the digital multimeter of Keithley 2007 and computer according to acquisition system 13, the digital multimeter of the Keithley 2007 is received
Collection thermometer and pressure sensor electric current or voltage signal, be then communicated in computer, by conversion obtain temperature and
The measured value of pressure, by computer acquisition, the data collecting system works out journey to the detection signal of displacement transducer by Labview
Sequence is automatically controlled and gathered.
As shown in Figures 2 and 3, the diffusion chamber 10 is by diffusion chamber cavity and the diffusion chamber being arranged on diffusion chamber cavity
Top cover 21 is connected and composed by fixing bolt 18, and the first sealing ring 25 is housed to ensure sealing in junction.The diffusion
Whole diffusion chamber is divided into upper and lower two parts by the moveable piston 30 installed in the cavity of chamber, is referred to as upper chamber and lower chambers,
The upper bracket 27 and lower carriage 29 that scope is moved up and down for limiting moveable piston 30 are provided with the diffusion chamber cavity, and
The second sealing ring 28 contacted with diffusion chamber inside cavities wall is provided with moveable piston 30, makes to be separated by moveable piston 30
Two parts up and down do not connect.The diffusion chamber top cover 21 is provided with the constant pressure gas source air inlet 19 connected with upper chamber, with subtracting
Pipeline one end of pressure valve 16 is connected with constant pressure gas source air inlet 19, and the other end is connected with the interface of pressure control gas cylinder 17, the diffusion chamber
10 side wall is provided with the pressure sensor mounting interface 23 and diffusion chamber air inlet 24 connected with lower chambers, and second pressure is passed
Sensor 14 is arranged on pressure sensor mounting interface 23, and the pipeline one end with the 4th valve 8 is connected to air chamber 6, the other end
It is connected with diffusion chamber air inlet 24.By pressure-reducing valve 16 and second pressure sensor 14, accurately can adjust in upper chamber
Pressure, and keep pressure constant in the moving process of moveable piston 30.The diffusion chamber top cover 21 also has displacement sensing
Device mounting interface 20, the interface installs displacement transducer 9, the displacement for measuring above-mentioned piston in real time.The diffusion chamber
10 carry high pressure visable window 22, and the good quartz glass 26 of translucency is provided with high pressure visable window, and quartz glass is led to by flange
Cross bolt and gasket seal is fixed, visual window facilitates look at diffusion intracavity gas real-time spread condition in a liquid.
Under above-mentioned variable volume constant pressure gas in a liquid the measurement apparatus of diffusion coefficient application method include it is following
Step：
1) preparation
A, the volume for measuring part under moveable piston in the volume of air chamber 6 and diffusion chamber 10.At a constant temperature will
Water is filled respectively in two containers of required measurement, then to be weighed and of poor quality draw surveyed volume V before and after injection waterG、VE,
Wherein VGBe the volume of air chamber 6, including connecting line (pipeline of the 4th valve 8 to air chamber 6) volume, VEIt is above-mentioned work
The diffusion chamber volume of the piston lower portion point when plug is moved to lower carriage 29, including connecting line (the 4th valve 8 to diffusion chamber 10
Pipeline) volume.
The air-tightness of b, detection means.The second valve 4, the 3rd valve 5 and the 4th valve 8 are opened, with vavuum pump 2 by device
It is evacuated to less than 1kPa, if the pressure after half an hour in device is again below 1kPa, then opens the first valve 3 by gas
The injection pressure of sample bottle 1 is the gas of 10MPa, if the pressure after half an hour in device does not decline, then it is considered that real
The air-tightness of check system is good.
C, measured equipped with the quality of presser for liquid reagent bottle is surveyed with precision electronic balance, be then injected into a certain amount of liquid
In the lower chambers of diffusion chamber 10, the quality of reagent bottle is measured again, the matter for being liquid in diffusion chamber 10 of poor quality for measuring twice
M is measured, and will be equipped with the diffusion chamber of surveyed liquid and be connected in experimental system.
2) measure
A, thermostat 11 is adjusted to target temperature, open the second valve 4, the 3rd valve 5 and the 4th valve 8, use vacuum
Be evacuated for device by pump 2, and makes surveyed liquid degassing.
B, closing the second valve 4 and the 4th valve 8, open the first valve 3, and the gas in gaseous sample bottle 1 is filled into gas
In body cavity 6, until gas cavity pressure be about goal pressure 2 times (ensure air chamber can give diffusion chamber provide goal pressure
Gas) close the first valve 3 and the 3rd valve 5 afterwards.After pressure stability in air chamber 6, the pressure of now air chamber is recorded
The temperature of power and thermostat 11.Then pressure-reducing valve 16, regulation to goal pressure are opened.Finally open the 4th valve 8, several seconds
Rapid closing, records the temperature of pressure and thermostat 11 in now air chamber 6 afterwards.After the closing of 4th valve 8 under any time t
The distance of pressure, moveable piston 30 movement in diffusion chamber 10, the temperature of thermostat 11 are automatic by data collecting system 13
Record is preserved.
After one-shot measurement terminates, it is vented using the 5th valve 15.
3) calculate
The volume V of surveyed liquid1Can be calculated by following formula：
Wherein m is the quality of liquid, and ρ is the mass density of liquid.Volume with the dissolving liquid of gas can become
Change, measure the change of liquid level by high pressure visable window using video camera, and to V1It is modified.
The total mole Δ n of intracavity gas is spread in diffusion before starting：
Δ n=n1-n2 (2)
Wherein, n1、n2By surveyed in air chamber gas be discharged into gas intracavity gas before and after diffusion chamber lower chambers mole
Amount, respectively by the density p of gas intracavity gas1、ρ2Gentle fluid chamber volume VGIt is calculated：
Wherein MgIt is the molal weight of gas, gas under different temperatures pressure can be accurately calculated using REFPROP softwares
The density p of gas in container1And ρ2。
After gas in air chamber enters diffusion chamber, the pressure of part is more than moveable piston under moveable piston during beginning
The pressure of upper part, the piston can rapidly move up a segment distance, now open the 5th valve 15 by upper piston area partial pressure
Power is adjusted to goal pressure.Then because gas is gradually dissolved into liquid, the piston can be moved down slowly, any time
The displacement of t is L2, then the volume V under moment t under moveable piston in the diffusion chamber of partDFor (with diffusion chamber cavity as cylinder
As a example by shape, piston lower surface is smooth, and section radius of circle is for r)：
VD=VE+πr2(L1-L2) (5)
Wherein, VEThe volume of the piston lower portion point, L when moving to lower carriage for moveable piston1It is piston movement to lower branch
During frame 29 displacement transducer to piston distance, then under any time t diffusion chamber bottom chamber gas part volume VgFor：
Vg=VD-V1 (6)
The mole n of diffusion chamber bottom chamber gasg(the undissolved gas molar amount in liquid i.e. in diffusion chamber) leads to
Following formula is crossed to be calculated：
ρgIt is the density of diffusion chamber bottom chamber gas under any time t.
The mole of the gas for being dissolved into liquid in moment t diffusion chamber is：
In time t, concentration is defined as space average concentration in gas diffusion to liquid<C>, it is calculated by following formula：
It is various more than,<C>Final expression formula be：
The diffusion in a liquid of diffusion chamber bottom chamber gas is considered as one-dimensional free diffusing, and has following vacation
If：Gas diffusion in a liquid is One-dimensional Diffusion Processes, does not have convection current to influence；There is a very thin contact with liquid phase in gas phase
Face, gas dissolving in a liquid is in saturation state at poised state, and contact surface；Temperature and pressure in diffusion chamber
Trying hard to keep, it is constant to hold.During the entire process of liquid diffusion, solution regards dilute solution as to gas, and its corresponding thermophysical property is not sent out
Changing.
Then according to Fick second theorems：
Primary condition：Work as t=0,0<z<During L,
Boundary condition：Work as t>When 0, z=0,
As z=L,
Wherein, D is diffusion coefficient, it is assumed that be a constant；C is gas dissolving concentration in a liquid, when it is diffusion
Between t and position z function；L be spread intracavity liquid thickness (i.e. height, spread intracavity liquid height L passed through by altitude meter
Visual window measurement is obtained)；Z=0 is gas-liquid contact face；C0It is gas initial concentration in a liquid；CSBe in goal pressure p and
Gas dissolves the concentration of saturation state in a liquid under temperature T.
By primary condition and boundary condition, formula (11) is solved can be obtained：
Wherein λn=(n+1/2) π/L.In time t, gas space average concentration in a liquid<C>Can by following formula
To be calculated：
Under stationary temperature and pressure, C0It is known with L, is obtained using measurement<C>Relation with time t is carried out
Nonlinear fitting, can be calculated diffusion coefficient D and saturated concentration CS.Although above formula is public comprising a summation for unlimited item
Formula, but actual some fitting results to above formula only above have an impact, and appropriate item number n is chosen in fit procedure
.
Claims (10)
1. under a kind of variable volume constant pressure gas diffusion coefficient in a liquid measurement apparatus, it is characterised in that：The device includes gas
Body cavity (6), diffusion chamber (10), thermostat (11) and pressure control gas cylinder (17), the air chamber (6) and diffusion chamber (10) are set
In thermostat (11), the first pressure sensor (7) for detecting air chamber (6) interior pressure is provided with air chamber (6), expanded
Dissipate in chamber (10) and be provided with the piston that can be moved up and down in limited range, piston by diffusion chamber (10) be divided into positioned at piston with
On upper chamber and the lower chambers two parts below piston, pressure control gas cylinder (17) is by the pipeline with pressure-reducing valve (16)
Upper chamber with diffusion chamber (10) is connected, and the second pressure sensor for detecting cavity of resorption chamber pressure is provided with diffusion chamber (10)
(14) and for detecting the displacement transducer (9) that piston position changes, air chamber (6) is by the pipeline with sampling valve and expansion
The lower chambers for dissipating chamber (10) are connected.
2. according to claim 1 under a kind of variable volume constant pressure gas diffusion coefficient in a liquid measurement apparatus, its feature
It is：Be provided with change for observing testing liquid liquid level position and gas diffusion process on the diffusion chamber (10) can
Form (22).
3. according to claim 1 under a kind of variable volume constant pressure gas diffusion coefficient in a liquid measurement apparatus, its feature
It is：Upper bracket (27) and lower carriage (29) are provided with the diffusion chamber (10), the movement of the piston is limited in upper and lower branch
Between frame.
4. according to claim 1 under a kind of variable volume constant pressure gas diffusion coefficient in a liquid measurement apparatus, its feature
It is：Described device also includes the first valve (3), the second valve (4), the 3rd valve (5), air bleeding valve, vavuum pump (2) and gas
Body sample bottle (1), the 3rd valve (5) is connected with air chamber (6), and the first valve (3) is arranged at gaseous sample bottle (1) and the 3rd valve
On the connecting line of door (5), the second valve (4) is arranged on the connecting line of vavuum pump (2) and the 3rd valve (5), air bleeding valve
It is connected with the upper chamber of diffusion chamber (10) by the pipeline with pressure-reducing valve (16).
5. according to claim 1 under a kind of variable volume constant pressure gas diffusion coefficient in a liquid measurement apparatus, its feature
It is：Described device also includes data collection and transmission, first, second pressure sensor, displacement transducer (9) and use
It is connected with data collection and transmission respectively in the thermometer (12) of detection thermostat (11) temperature.
6. according to claim 5 under a kind of variable volume constant pressure gas diffusion coefficient in a liquid measurement apparatus, its feature
It is：The data collection and transmission is according to the piston displacement gathered during gas diffusion under constant temperature and pressure to liquid
The space average concentration that gas does not spread in a liquid in the same time is calculated, then to solving the sky for obtaining according to Fick second theorems
Between mean concentration equation carry out nonlinear fitting, obtain gas diffusion coefficient in a liquid.
7. under a kind of variable volume constant pressure gas diffusion coefficient in a liquid measuring method, it is characterised in that：Comprise the following steps：
1) it is part below testing liquid injection diffusion chamber (10) inner carrier of m by quality, diffusion chamber (10) is then placed in perseverance
In warm groove (11), and it is connected with the air chamber (6) in thermostat (11), then to the liquid in injection diffusion chamber (10) by taking out
Vacuum is de-gassed treatment, while making the piston in diffusion chamber (10) be moved to lower position by vacuumizing；
2) in the cavity for injecting between diffusion chamber (10) interior liquid levels and piston the gas in air chamber (6), according to injection
The pressure change of front and rear air chamber (6) calculates the mole Δ n of the gas of injection diffusion chamber (10)；
3) stop after injection gas using being vented the pressure of valve regulation diffusion chamber (10) inner carrier above section to goal pressure,
The pressure of diffusion chamber (10) inner carrier above section is maintained into goal pressure using pressure-reducing valve (16) and pressure control gas cylinder (17)
Under the conditions of, record gas in a liquid in diffusion process any time t piston displacement L2, below diffusion chamber inner carrier
Displacement of the partial pressure and piston at the correspondence moment calculates the mole of gas in diffusing to liquidAccording toIt is right to calculate
Answer the space average concentration in moment gas diffusion to liquid<C>；
4) using the space average concentration at multiple moment under the goal pressure being calculated, to being solved according to Fick second theorems
To space average concentration equation carry out nonlinear fitting, obtain gas diffusion coefficient in a liquid.
8. according to claim 7 under a kind of variable volume constant pressure gas diffusion coefficient in a liquid measuring method, its feature
It is：It is describedCalculate in such a way：
Vg=VD-V1
VD=VE+πr2(L1-L2)
Wherein, ngIt is the mole of the empty intracavity gas, V1To inject the volume of the liquid of diffusion chamber, VEFor piston is moved to
The diffusion cavity volume of part below the piston, ρ during lower positiongThe density of empty intracavity gas, M described in the correspondence momentgIt is gas
Molal weight, VDIt is the diffusion cavity volume of part below correspondence moment piston, VgTo correspond to the volume of cavity described in the moment, r is
Piston cross-section radius.
9. according to claim 7 under a kind of variable volume constant pressure gas diffusion coefficient in a liquid measuring method, its feature
It is：The space average concentration is calculated in such a way：
Wherein, V1To inject the volume of the liquid of diffusion chamber.
10. according to claim 7 under a kind of variable volume constant pressure gas diffusion coefficient in a liquid measuring method, its feature
It is：The space average concentration equation is expressed as：
Wherein, λn=(n+1/2) π/L；D is diffusion coefficient；T is diffusion time；L is the thickness for spreading intracavity liquid；C0It is gas
Initial concentration in a liquid, CSFor constant pressure and at a temperature of gas saturation concentration of ordinary dissolution in a liquid；N is fit term
Number.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107894377A (en) * | 2017-12-25 | 2018-04-10 | 西安交通大学 | A kind of device and method for being applied to measurement binary solution interdiffusion coefficient |
| CN108106970A (en) * | 2017-12-15 | 2018-06-01 | 中国石油大学(北京) | Visual heat resisting and pressure resisting device, gas-liquid interface mass transfer dissolving measuring device and method |
| CN108931280A (en) * | 2018-06-19 | 2018-12-04 | 合肥国轩高科动力能源有限公司 | A kind of detection device and its detection method of lithium ion battery volume |
| CN111337391A (en) * | 2020-04-26 | 2020-06-26 | 清华大学 | Method for rapidly measuring diffusion coefficient of gas in liquid |
| CN112191118A (en) * | 2020-09-28 | 2021-01-08 | 艾吉析科技(南京)有限公司 | Preparation method of high-precision mixed gas solution |
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| CN105806738A (en) * | 2016-03-11 | 2016-07-27 | 西安交通大学 | Variable-volume pressure fixing device and method for measuring solubility of gas in liquid |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108106970A (en) * | 2017-12-15 | 2018-06-01 | 中国石油大学(北京) | Visual heat resisting and pressure resisting device, gas-liquid interface mass transfer dissolving measuring device and method |
| CN108106970B (en) * | 2017-12-15 | 2019-09-24 | 中国石油大学(北京) | Visual heat resisting and pressure resisting device, gas-liquid interface mass transfer dissolution measuring device and method |
| CN107894377A (en) * | 2017-12-25 | 2018-04-10 | 西安交通大学 | A kind of device and method for being applied to measurement binary solution interdiffusion coefficient |
| CN107894377B (en) * | 2017-12-25 | 2020-05-22 | 西安交通大学 | Device and method suitable for measuring mutual diffusion coefficient of binary solution |
| CN108931280A (en) * | 2018-06-19 | 2018-12-04 | 合肥国轩高科动力能源有限公司 | A kind of detection device and its detection method of lithium ion battery volume |
| CN111337391A (en) * | 2020-04-26 | 2020-06-26 | 清华大学 | Method for rapidly measuring diffusion coefficient of gas in liquid |
| CN112191118A (en) * | 2020-09-28 | 2021-01-08 | 艾吉析科技(南京)有限公司 | Preparation method of high-precision mixed gas solution |
| CN112191118B (en) * | 2020-09-28 | 2022-09-13 | 艾吉析科技(南京)有限公司 | Automatic preparation device of high-precision mixed gas solution |
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