CN107917857B - Radial capillary rheometer - Google Patents
Radial capillary rheometer Download PDFInfo
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- CN107917857B CN107917857B CN201710990143.5A CN201710990143A CN107917857B CN 107917857 B CN107917857 B CN 107917857B CN 201710990143 A CN201710990143 A CN 201710990143A CN 107917857 B CN107917857 B CN 107917857B
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- capillary
- capillary tube
- radial
- material cylinder
- rheometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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
- G01N11/04—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture
Abstract
The invention relates to a radial capillary rheometer which is provided with a large material cylinder for containing a high-molecular fluid to be tested, wherein the center of the bottom of the large material cylinder is connected with a small material cylinder, a first capillary and a second capillary are radially arranged on two sides of the bottom end of the small material cylinder, and a pressure sensor for measuring the pressure of the fluid is arranged on the bottom surface of the small material cylinder. The invention adopts the radial arrangement of the capillary tube, is convenient for testing the inlet pressure in the capillary tube and observing the flow condition in the capillary tube, improves the testing efficiency and saves the manufacturing cost.
Description
Technical Field
The invention relates to the technical field of rheology test, in particular to a radial capillary rheometer.
Background
In the traditional capillary rheometer structure, a capillary tube is generally arranged below a material cylinder, and the space where the capillary tube is located is narrow, so that a pressure sensor for measuring pressure can only be arranged on the side surface of the bottom of the material cylinder, when a polymer material to be measured flows into the capillary tube from the material cylinder, a part of pressure energy is converted into elastic energy due to the stretching tendency of the polymer material, so that the inlet pressure loss at the capillary tube is large, and the fluid pressure measured by the pressure sensor at the tail end of the material cylinder is higher than the pressure in the capillary tube, so that inlet pressure correction needs to be carried out, such as Bagley correction or pressure correction by adopting a double-cylinder capillary tube (a common capillary tube and a zero-length capillary tube), and meanwhile, the capillary tube is arranged under the material cylinder, so that the flowing condition.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects in the prior art, the invention provides the radial capillary rheometer which is convenient for testing the pressure of the capillary inlet and improves the testing efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a radial capillary rheometer, has the big feed cylinder that holds the test high-molecular fluid that awaits measuring, big feed cylinder bottom central point put and be connected with little feed cylinder, first capillary and second capillary are radially installed to little feed cylinder bottom both sides, and the pressure sensor of survey fluid pressure is installed to little feed cylinder bottom surface.
In order to better reduce the pressure loss, the joint of the large material cylinder and the small material cylinder is provided with a 45-degree chamfer angle for realizing the slow inflow of the fluid from the large material cylinder to the small material cylinder.
Further, the diameters of the first capillary and the second capillary may be equal or unequal, and may be selected according to the actual requirements of the test fluid.
Preferably, the diameters of the first capillary and the second capillary are between 0.5 and 1.5 mm.
The invention has the beneficial effects that: the invention adopts the radial arrangement of the capillary tube, is convenient for testing the inlet pressure in the capillary tube and observing the flow condition in the capillary tube, improves the testing efficiency and saves the manufacturing cost.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. big feed cylinder 2, small feed cylinder 3, first capillary 4, second capillary 5, pressure sensor 6 chamfer
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
The radial capillary rheometer shown in fig. 1 has a large material cylinder 1 for containing a high molecular fluid to be tested, a small material cylinder 2 is connected to the center of the bottom of the large material cylinder 1, and the diameter of the small material cylinder 2 is far smaller than that of the large material cylinder 1.
The two sides of the bottom end of the small charging barrel 2 are radially provided with a first capillary tube 3 and a second capillary tube 4, the diameters of the first capillary tube 3 and the second capillary tube 4 can be equal or unequal, the capillary tubes can be selected according to needs, and preferably, the diameters of the first capillary tube 3 and the second capillary tube 4 are between 0.5mm and 1.5mm, such as 0.5mm/1.0mm/1.5 mm. First capillary 3 and second capillary 4 can use simultaneously, also can only use a capillary, when using a capillary, can block up another with the end cap, because first capillary 3 and second capillary 4 adopt radially to be connected the mounting means with little feed cylinder 2, and the space is great, consequently makes things convenient for first capillary 3 and second capillary 4's change to dismantle.
The small cylinder 2 is provided at the bottom thereof with a pressure sensor 5 for measuring a fluid pressure to detect a pressure when the material flows from the small cylinder 2 into the first capillary tube 3 and the second capillary tube 4.
The joint of the large charging barrel 1 and the small charging barrel 2 is provided with a 45-degree chamfer 6 for realizing the slow inflow of fluid from the large charging barrel 1 to the small charging barrel 2, the material can slowly transit from the large charging barrel 1 through the chamfer 6 and flow into the small charging barrel 2, and the pressure loss is reduced (part of pressure can be converted into the elastic energy of high polymer materials).
The small cylinder 2 plays a transition role to realize the connection between the large cylinder 1 and the first capillary 3 and the second capillary 4, because the diameter of the large cylinder 1 is more than ten times or even tens of times of the diameter of the first capillary 3 or the second capillary 4, a large inlet pressure loss is generated, and because the diameter of the small cylinder 2 is small, when the material transits from the small cylinder 2 to the first capillary 3 or the second capillary 4, the inlet pressure loss is small and can be approximately ignored, so that the inlet pressure correction is avoided.
Because the lower space of the rheometer is large, a visualization device can be adopted on the first capillary 3 and the second capillary 4 which are radially arranged, for example, a transparent glass cover plate is used, and light beams are adopted for photographing or shooting, so that the flowing condition of materials in the first capillary 3 and the second capillary 4 can be observed; and the first capillary 3 and the second capillary 4 are radially arranged, so that the influence of gravity on the material flow in the first capillary 3 and the second capillary 4 is reduced.
According to the requirement, the materials in the large material cylinder 1, the small material cylinder 2, the first capillary tube 3 and the second capillary tube 4 are protected by nitrogen gas, so that the materials are prevented from being oxidized at high temperature in the air. Other temperature control devices are consistent with conventional capillary rheometers.
The invention is an improvement on the basis of the traditional capillary rheometer, and the testing principles (such as shear rate and shear stress formula) of the traditional capillary rheometer and the traditional rotational rheometer are still applicable to the invention. A computer connected with the rheometer is provided with a test software, and experimental data and curves can be recorded and processed by the computer software.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (4)
1. A radial capillary rheometer having a large cartridge (1) containing a high molecular fluid to be tested, characterized by: big feed cylinder (1) bottom central point put and be connected with little feed cylinder (2), first capillary (3) and second capillary (4) are radially installed to little feed cylinder (2) bottom both sides, are located to be equipped with on first capillary (3) and second capillary (4) and are convenient for adopt the light beam to shoot or the transparent glass apron of making a video recording, pressure sensor (5) of survey fluid pressure are installed to little feed cylinder (2) bottom surface.
2. The radial capillary rheometer of claim 1, wherein: the joint of the large charging barrel (1) and the small charging barrel (2) is provided with a 45-degree chamfer (6) for realizing the slow inflow of fluid from the large charging barrel (1) to the small charging barrel (2).
3. The radial capillary rheometer of claim 1, wherein: the diameters of the first capillary tube (3) and the second capillary tube (4) can be equal or unequal.
4. The radial capillary rheometer of claim 3, wherein: the diameters of the first capillary tube (3) and the second capillary tube (4) are 0.5-1.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710990143.5A CN107917857B (en) | 2017-10-23 | 2017-10-23 | Radial capillary rheometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710990143.5A CN107917857B (en) | 2017-10-23 | 2017-10-23 | Radial capillary rheometer |
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| Publication Number | Publication Date |
|---|---|
| CN107917857A CN107917857A (en) | 2018-04-17 |
| CN107917857B true CN107917857B (en) | 2020-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710990143.5A Active CN107917857B (en) | 2017-10-23 | 2017-10-23 | Radial capillary rheometer |
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Citations (6)
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| CN87216713U (en) * | 1987-12-20 | 1988-10-12 | 冮殿坚 | Blood flow detector with infrared photoelectric sensor |
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| CN107144496A (en) * | 2017-05-21 | 2017-09-08 | 郑州大学 | Spray castable service behaviour test device and method of testing |
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| US20030127329A1 (en) * | 2001-06-04 | 2003-07-10 | Devoe Donald Lad | Field effect flow control apparatus for microfluidic networks |
| US6990850B2 (en) * | 2003-09-15 | 2006-01-31 | Taylor John A | Curtain coater rheology management |
| CN100480673C (en) * | 2005-11-12 | 2009-04-22 | 大连理工大学 | On-line type polymer double-capillary extrusion rheometer |
| DE102010043852A1 (en) * | 2009-11-24 | 2011-05-26 | Basf Se | Method and device for characterizing magnetorheological fluids |
| CN102323186B (en) * | 2011-05-25 | 2013-05-01 | 湖南工业大学 | Method for measuring fluid shear stress in capillary and device |
| CN103009601B (en) * | 2012-12-17 | 2016-02-03 | 常州大学 | Improve the extrusion molding mouth mould extruding productive rate and surface quality |
| CN104865161A (en) * | 2014-06-10 | 2015-08-26 | 中国石油天然气股份有限公司 | Method for measuring liquid viscosity by utilization of capillary and device used for method |
| CN106769676B (en) * | 2017-01-12 | 2023-12-15 | 中国石油大学(北京) | Device and method for improving and measuring liquid fluidity |
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| CN87216713U (en) * | 1987-12-20 | 1988-10-12 | 冮殿坚 | Blood flow detector with infrared photoelectric sensor |
| CN2049358U (en) * | 1989-04-03 | 1989-12-13 | 中国石油化工总公司大连石油化工公司 | Multijig rotational viscometer |
| CN1390302A (en) * | 1999-11-12 | 2003-01-08 | 瑞罗吉公司 | Dual riser/single capillary viscometer |
| CN102150042A (en) * | 2008-08-11 | 2011-08-10 | 藤森工业株式会社 | Blood-platelet test method and blood-platelet test device |
| CN102590032A (en) * | 2012-02-28 | 2012-07-18 | 西南科技大学 | Viscous dissipation measuring device and measuring method |
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| CN107917857A (en) | 2018-04-17 |
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