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Updatetime: 2015-02-13 11:56:08
mode: SL200HP
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Features: Drop shape analysis system model SL200HP is designed for measurement of contact angle, surface tension (liquid-gas) or interfacial tension (liquid-fluid) under such special conditions as ultra-high pressure (max 75Mpa) and high temperature (max 200℃) .
Drop shape analysis system model SL200HP is designed for measurement of contact angle, surface tension (liquid-gas) or interfacial tension (liquid-fluid) under such special conditions as ultra-high pressure (max 75Mpa) and high temperature (max 200℃) . Thanks for its heating cell for such viscous sample as crude oil, SL200HP is the only instrument that can be used for application of tertiary oil recovery (EOR) especially for measurement of interfacial tension between ASP-crude oil.
1, Measurement of contact angle / surface tension under ultra-high pressure and high temperature environment
Contact angle, θ, is defined as the angle between tangent of gas-liquid interface and that of solid-liquid interface formed at the three phases' boundary where liquid, vapor and solid intersect.
1. Contact angle measurement: The drop formed under high pressure is usually shaped into an approximate ellipsoid in 3D due to its gravity, hence we adopt Young-Laplace equation fitting technology（ADSA?）to fit its shape in 2D, and then calculate its contact angle between liquid drop and solid under gas or fluid surroundings.
2.?Surface?tension?measurement?under?pressure and high?temperature: For drop under high pressure and high temperature, its surface chemical properties can be characterized by its drop shape profile; hence we here analyze it using Young-Laplace equation fitting method (ADSA?) via sessile drop method; volume and surface tension can be calculated then by pendant drop, sessile drop or constrained sessile drop method.
Young-Laplace equation and software CAST?3.0
First, single or several dynamic images of drop/bubble are captured for us to analyze its key information like drop shape edge and geometric dimension via sub-pixel image recognition technology; By inputting some important parameters like density, gravitational acceleration, magnification and others, we compare and fit the real drop shape profile with theoretical curve generated by sophisticated mathematical analytical models (such as circle, ellipse, polynomial, spline curve and especially Young-Laplace equation fitting) using least square method; and finally surface tension of liquid-gas, interface tension of liquid-liquid, contact angle of solid-gas/liquid-liquid-solid are calculated.
Our great achievement is: initiating ADSA based Young - Laplace equation fitting method and apply it into analysis of interfacial chemical properties after our 3 decades endeavor. Equation of Young-Laplace is as below:
γ(1/R_1 +1/R_2 )=Δρgz+2γ/b
2, Typical fields of application
- Oil field especially for tertiary oil recovery such as develop ASP or SP flooding or CO2
- Evaluating value of surface tension, interfacial tension or contact angle for surfactant or field of developing advanced material via pressure (-75Mpa ) and temperature (-30-200℃)
- Detergent ~ surfactant’s absorbing speed, property, discussion of proper concentration
3, Schematic Draw of SL200HP
Performance Features
1, High-pressure and high temperature chamber-More professional and safety
→chambers of different pressure (10M Pa, 30M Pa, 50M Pa, 70M Pa or more) are provided to meet special requirements under different ultra-high pressure;
→Temperature range can be -30-200℃ with circulating water jacket that connecting to a refrigerated-circulator or heating circulator to control temperature;
→Easy to change the tube and needle and easy to clean the chamber to avoid cross?contamination that may affect result;
→Exclusively provide a heating cell for crude oil to measure interfacial tension between ASP-crude oil;
→Extra provide a standard connector for gas such as CO2.
2, Mechanics-professional and easy to operate
→Mechanics of three-axis precision positioning stages for lens control provide you clearer imaging and more accurate imaging position;
→Lens tilt control and level control of chamber facilitate determining baseline between melt and solid and easy to get a vertical needle.
→Tilted unit for adjusting vision angle of parallel background light to promise a good drop shape.
3, Clearer and higher speed vision system
→Advanced drop shape profile lens and parallel background light ensures sharper imaging and clearer drop image edge;
→Continuous zoom industrial lens with magnification of 0.35－4.5X enables larger VOA, suitable for samples of varies volumes;
→Lens with long working distance (180mm) effectively protect vision system from high temperature;
→World highest speed camera from Germany can reach 87FPS (WVGA)-340FPS (GIF)
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High pressure chamber |
10MPa, 30MPa, 50MPa, 70MPa for you to choice |
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Max Pressure |
-70MPa ( Higher pressure for option) |
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Temperature control method |
Provide a jacket to thermostat by external bath |
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Max temperature |
200℃ |
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Temperature Range |
-30-200℃ (Depended on refrigerated-circulator that selected) |
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Windows material |
Sapphire (above 50MPa) or quartz glass (below 30MPa) |
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Windows ID |
About 18mm |
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Material of Chamber |
Stainless steel (Hastelloy C276 for option) |
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Internal volume: |
approx. 12.7 mL |
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Pressure reading system |
A digital pressure meter that reading pressure data via pressure sensor. Resolution: 0.01MPa, Accuracy: 0.25, Max pressure: 100M Pa, Interface: RS485 |
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Heating Cell |
Standard provide to heat sample with viscosity such as crude oil |
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Temperature control method |
Provide a jacket to thermostat by external bath |
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Max temperature |
200℃ |
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Temperature Range |
-30-200℃ (Depended on refrigerated-circulator that selected) |
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Temperature sensor |
PT100 with resolution 0.1℃ |
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High pressure screw piston pump |
To form a drop in air (one pump) or form a drop in fluid (two pump) |
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Control method |
Manual (Automatically pump for option) |
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Max pressure |
85MPa |
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Drain port |
Provided with a drain port at the bottom of the chamber |
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Max volume of container |
100mL (container made of quartz glass with volume 250mL) |
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Value and tube |
Made of stainless steel for high pressure system |
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Control of vision system |
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3 axis positioning stage |
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Positioning stage of XY axis with travel range 60mm and accuracy about 0.01mm, positioning stage of Z axis with travel range 13mm and accuracy 0.01mm. |
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Multi-axis positioning stage |
for levelness adjustment of vision system with micrometer |
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Tilted positioning stage |
For adjusting tilted angle of parallel background light |
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Dimension and weight |
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Dimension of Main body |
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90(L)*35(W)*65 (H) cm |
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Weight of Main body |
41kg |
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Dimension of piston pump |
18(L)*90(W)*60 (H) cm / per unit |
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Weight of piston pump |
34kg / per unit |
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