CN112986056A - Resistance reduction experimental device for reducing circular tube development turbulence section and using method thereof - Google Patents
Resistance reduction experimental device for reducing circular tube development turbulence section and using method thereof Download PDFInfo
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- 230000009467 reduction Effects 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000025594 tube development Effects 0.000 title claims description 11
- 239000007788 liquid Substances 0.000 claims abstract description 108
- 238000012360 testing method Methods 0.000 claims abstract description 39
- 239000004094 surface-active agent Substances 0.000 claims abstract description 19
- 239000012530 fluid Substances 0.000 claims abstract description 17
- 238000011161 development Methods 0.000 claims abstract description 11
- 230000009471 action Effects 0.000 claims abstract description 6
- 239000006260 foam Substances 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000018109 developmental process Effects 0.000 claims description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 6
- 150000002500 ions Chemical class 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 abstract description 31
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000008859 change Effects 0.000 description 9
- 230000007704 transition Effects 0.000 description 5
- 238000011160 research Methods 0.000 description 4
- WOWHHFRSBJGXCM-UHFFFAOYSA-M cetyltrimethylammonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCC[N+](C)(C)C WOWHHFRSBJGXCM-UHFFFAOYSA-M 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- ABBQHOQBGMUPJH-UHFFFAOYSA-M Sodium salicylate Chemical compound [Na+].OC1=CC=CC=C1C([O-])=O ABBQHOQBGMUPJH-UHFFFAOYSA-M 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229960004025 sodium salicylate Drugs 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
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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
- 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
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Abstract
The invention relates to the field of surfactant drag reduction experiments, in particular to a drag reduction experiment device for reducing a circular tube turbulence development section and a using method thereof. The method is characterized in that a device with a special shape for disturbing the flow state of fluid, namely an inner-tooth-shaped turbulence device, is fixedly arranged at the joint of a liquid inlet chamber and a testing section in a circulating loop of the whole drag reduction experimental device. During the experiment, the solution of the circulation loop passes through the inner tooth type turbulence device, and under the action of the inner tooth type turbulence device, the flow state of the solution in the pipe orifice near the pipe wall area is changed to a certain extent, so that the solution is changed from the laminar flow to the turbulent flow. The invention solves the problem of longer test tube in the state of forming complete turbulence, reduces the length of the inlet section, can realize the conversion of layer flow direction to complete turbulence earlier, saves the experiment cost, improves the experiment efficiency, achieves the aim of reducing the requirement on a laboratory and ensures that the experiment is more convenient.
Description
Technical Field
The invention relates to the field of a resistance reduction experiment of a surfactant, in particular to a resistance reduction experiment device for reducing a circular tube turbulence development section.
Background
The surface active agent turbulence drag reduction technology is one of energy-saving measures which can be effectively utilized in long-distance liquid conveying or a liquid circulating system, has wide application prospect, and has important significance for improving the energy utilization efficiency, protecting the ecological environment and the like. Therefore, the drag reduction experiment of the surfactant has certain guiding significance for practical production and application. However, because the surfactant drag reduction phenomenon can only occur when the fluid is in a turbulent state, drag reduction does not occur when the solution is in a laminar state. Therefore, in view of this property of surfactant drag reduction, the drag reduction experimental apparatus was designed with a test tube length that required complete transition of flow state from laminar to turbulent flow as the fluid passed through. When an experiment of fluid drag reduction is performed in a round tube, the flow state of fluid in the round tube gradually develops into stable turbulence with the change of reynolds number, and the transition takes a certain time. Because the length requirement of the fully developed turbulence section of the requirement of the resistance reduction experiment carried out on the round pipes with different pipe diameters is inconsistent, the development section of the requirement of the constantly increased pipe diameter of the resistance reduction experiment round pipe can be longer, the whole built experiment platform is increased accordingly, and further higher requirements are provided for the field range of a laboratory.
However, in the prior experimental study of drag reduction characteristics, the characteristics of turbulent drag reduction determine that the fluid must be in a completely turbulent state to produce drag reduction effect. The premise of the drag reduction experiment is that the flow state of the solution in the test tube is to achieve complete turbulence. The required development segment lengths are different for different pipe diameters. Most drag reduction experiments were conducted in small pipe diameters or microchannels because complete turbulence can be achieved in shorter test tubes, but very little is done for large pipe diameter drag reduction experiments. Such as: the tube diameters of Yuyanfei experiment of Jiangsu university are 5mm, 10mm and 20mm respectively, and the development section length is designed according to an empirical formula L ≧ 138D; the research on the resistance-reducing flow characteristics of the micro-channel is carried out by Liuxing of university of great continent; the influence effect of the large pipe diameter on the drag reduction is ignored, and meanwhile, no clear design standard exists for the length of the development segment of the large pipe diameter.
At present, in the existing drag reduction characteristic experimental device in China, the reduction of the fully developed length is rarely considered. Such as patents CN201310019881.7 and CN200710117757.9, are developed lengths of development segments designed according to empirical formulas derived from some turbulence experiments conducted by early scholars. Although a fully developed turbulent state is realized and the measurement of the drag reduction data can be realized, when a surfactant drag reduction experiment with a larger pipe diameter is carried out, the required development section is very long, and the complexity of the experiment and the experiment cost are increased. There are also some settings for adding turbulence in foreign drag reduction experiments: a ladder like that designed by Moon/Rudinger, 1977; old/Stevernson. 1990 designed nozzle device. The notch cuttype disturbing device and the nozzle device also increase the torrent and change to a certain extent, nevertheless have certain limitation to the requirement of pipe diameter, and the processing design is also not as convenient as interior profile of tooth vortex device, and interior profile of tooth vortex device can be adapted to the occasion of different pipe diameters to it is all convenient that its installation is changed to dismantle.
Disclosure of Invention
The invention aims to solve the problems and provides a resistance reduction experimental device for reducing a turbulent flow section of a circular tube and a using method thereof.
The purpose of the invention is realized as follows: a resistance reduction experimental device for reducing a circular tube development turbulence section comprises a liquid storage tank, a stirrer, a testing section, an inner tooth-shaped spoiler, a liquid inlet chamber, a liquid outlet chamber and a liquid outlet tube, the feed liquor pipe, the circulating pump, the filter screen, the foam discharging valve, little differential pressure transmitter, the electromagnetic flowmeter, be provided with agitating unit in the liquid reserve tank, the liquid reserve tank sub-unit connection has the feed liquor pipe, the feed liquor pipe other end is connected to the feed liquor cavity, start circulating pump and electromagnetic flowmeter to set gradually from being close to liquid reserve tank one end on the feed liquor pipe, be provided with filter screen and foam discharging valve in the feed liquor cavity, the test section is connected to the feed liquor cavity other end, the test section other end is connected to the liquid cavity, the feed liquor cavity is provided with interior tooth type spoiler with the junction of test section, the one end that is close to the liquid cavity on the test section is provided with little differential pressure transmitter, the drain.
A use method of a drag reduction experiment device for reducing a circular tube development turbulence section comprises the following steps:
the method comprises the following steps: selecting a solution with the concentration of 10ppm-100ppm within the range of 1: 1-1: 1.5 by mass of the compensating ions and the surfactant; step two: the power line on the circulating pump is communicated with an external socket and then starts to operate, the prepared solution is added into the water storage tank and is conveyed into the liquid inlet pipeline under the power action of the circulating pump, meanwhile, the stop valve of the liquid inlet and separating chamber connected with the liquid inlet pipeline is opened to enable the fluid to be buffered in the liquid inlet and separating chamber and to be filled in the liquid inlet and separating chamber, and after the operation is carried out for 10-15 minutes, the fluid is completely filled in the liquid inlet and separating chamber; step three: opening a foam discharging valve to discharge foam, standing for 10-15 minutes, restarting a circulating pump, and recording experimental data after the device stably runs for 10-15 minutes; step four: changing different working conditions of temperature and surfactant concentration, repeating the first step to the third step, and collecting multiple times of experimental data; step five: the recorded flow and pressure drop are collated and analyzed and then processed through formula Cf=Π2d5Δp/32ρlQ2Obtaining the drag reduction ratio DR = (C)f water-Cf solution of）/Cf water。
Furthermore, the filter screen divides the liquid inlet cavity into two sections at one end close to the liquid inlet pipe and at one end close to the testing section.
Furthermore, the foam discharging valve is arranged above the liquid inlet cavity close to one end of the testing section and is 30-70 mm away from the connecting position of the liquid inlet cavity and the testing pipe.
Furthermore, an electric device circulation, an electromagnetic flowmeter, a micro-pressure transmitter and a stirring device in the pipeline are all connected with the control box, the electricity consumption is controlled through the control box, the electromagnetic flowmeter is connected in the pipeline in series through a flange, a motor on the pump is controlled through a frequency converter in the control box to change the frequency of the pump, the flow is further changed, and the electromagnetic flowmeter reads the flow in real time; the micro-differential pressure transmitter is connected with the testing section through a thin hose, and the stirring device is arranged in the liquid storage tank and drives the stirrer to rotate through the motor.
Furthermore, the stirrer is an electric stirrer, and the main components are impeller blades and a small motor.
Furthermore, three independent small liquid separation chambers 1#, 2#, and 3# are separated in the liquid inlet chamber, and three independent small liquid separation chambers 1 ', 2 ', and 3 ' are separated in the liquid outlet chamber; three stainless steel pipelines which correspond to the small liquid inlet cavity and the small liquid outlet cavity and have three different pipe diameters are sequentially connected in parallel, and one section of each stainless steel pipeline, which is close to the small liquid inlet cavity and the small liquid outlet cavity, is provided with a stop valve.
The invention has the beneficial effects that: the invention changes the initial Reynolds number entering the circular tube by the disturbance action of the internal tooth type disturbance device arranged at the inlet of the pipeline, thereby generating certain influence on the flowing state of the solution at the inlet. The conversion of the solution from laminar flow to turbulent flow is accelerated; the range of Reynolds number of the transition zone is shortened; the length of the fully developed turbulent flow section is reduced; the experimental time is shortened; the experimental efficiency is improved; the requirement on the laboratory site is reduced; provides a convenient method for the resistance reduction experiment in the future.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of an experimental apparatus for drag reduction characteristics of a surfactant solution.
FIG. 2 is a schematic view showing the connection between the inlet and outlet liquid-separating chambers and the testing section.
FIG. 3 is a schematic view of the connection of the liquid inlet pipe and the liquid inlet/outlet chamber.
Fig. 4 is a schematic view of the connection of the liquid outlet pipe and the liquid outlet chamber.
FIG. 5 is a schematic view of the installation of an internal tooth type spoiler in a test section.
FIG. 6 is a graph showing a change in coefficient of friction resistance of water.
FIG. 7 is a graph showing a change in coefficient of friction resistance.
FIG. 8 is a graph of the drag reduction ratio at 17 ℃.
Wherein: 1. the device comprises a liquid storage tank, 2 parts of a stirrer, 3 parts of a testing section, 4 parts of an inner tooth type spoiler, 5 parts of a liquid inlet chamber, 6 parts of a liquid outlet chamber, 7 parts of a liquid outlet pipe, 8 parts of a liquid inlet pipe, 9 parts of a circulating pump, 10 parts of a filter screen, 11 parts of a foam discharging valve, 12 parts of a micro-differential pressure transmitter and 13 parts of an electromagnetic flowmeter.
Detailed Description
Referring to fig. 1, a drag reduction experiment device for reducing a turbulent section of a circular tube comprises: the device comprises a liquid storage tank 1, a stirrer 2 arranged in the liquid storage tank 1, a testing section 3, an internal tooth-shaped spoiler 4 at an inlet of the testing section, a liquid inlet chamber 5 communicated with an inlet of the testing section 3, a liquid outlet chamber 6 communicated with an outlet of the testing section 3, a liquid outlet pipe 7 communicated with the liquid outlet chamber 6 and the liquid storage tank 1, a liquid inlet pipe 8 communicated with the liquid storage tank 1 and the liquid inlet chamber 5, and a circulating pump 9 arranged on the liquid inlet pipe 8; wherein, the liquid inlet chamber 5 and the liquid outlet chamber 6 are both square chambers; the inlet part of the testing section 3 is a convergent flow channel, and the outlet part of the testing section 3 extends into the liquid outlet chamber 6 and is a divergent flow channel; a filter screen 10 is arranged in the middle of the liquid inlet chamber 5, and a foam discharging valve 11 is arranged above the filter screen; the circulation pump 9 is a centrifugal pump. The data processing unit of the experimental device mainly comprises: the micro-differential pressure transmitter 12 arranged on the testing section and the electromagnetic flowmeter 13 for detecting the flow of the liquid inlet pipe acquire data such as pressure change, flow and the like. The electromagnetic flowmeter 13 is directly connected with a pipeline through a flange, the frequency of the pump is changed by controlling the motor through the frequency converter, the flow is further changed, and the flowmeter can read the flow in real time. Two pressure measuring holes with a distance of 1.2m in the differential pressure transmitter and the test tube are connected through a thin hose, the position of the second pressure measuring hole is 300mm away from the liquid outlet cavity, and the pressure drop can be read through the differential pressure transmitter.
Referring to fig. 2, when the experiment is carried out, the valve can prevent the independent experiment chamber from being influenced by the other two liquid separation chambers, and meanwhile, the procedure of replacing the pipe diameter can be reduced, and the influence on the experiment precision is reduced. The liquid inlet cavity is internally separated into three independent small liquid separation cavities 1#, 2#, and 3#, and the liquid outlet cavity is internally separated into three independent small liquid separation cavities 1#, 2#, 3# and 1 ', 2 ', 3 '; the three corresponding small liquid inlet chambers and small liquid outlet chambers are sequentially connected in parallel through stainless steel pipelines with three different pipe diameters (25 mm, 40mm and 65 mm), and stop valves are arranged at one sections of the stainless steel pipelines, which are close to the small liquid inlet chambers and the small liquid outlet chambers. The space size of the corresponding liquid inlet and outlet chambers is determined according to the diameter of the connected stainless steel pipe. The lengths of the liquid inlet and outlet chambers connected with the stainless steel pipes of 25mm are relatively small, and the lengths of the liquid inlet and outlet chambers connected with the stainless steel pipes of 40mm and 65mm are sequentially increased. The width and height of the whole liquid inlet and outlet chambers are kept consistent. In order to ensure that the solution reaches a complete turbulent flow state in advance and further reduce the development length, a disturbance device, namely an inner tooth type spoiler, is arranged at the joint of the liquid inlet chamber and the test tube, so that the flow state of the solution flowing through the inner tooth type spoiler is changed to a certain extent. The length of the test segment designed on this basis was 4.3 m. The disturbance effect of the internal tooth type spoiler is realized by adjusting the ratio of the flow area to the blocking area and the size of the internal tooth, the external profile of the internal tooth type spoiler can change the laminar flow state of the outer layer of the internal tooth type spoiler firstly when fluid flowing passes through the internal tooth type spoiler, and the fluid on the inner layer and the fluid on the outer layer can accelerate the transition to turbulent flow along with the continuous flow of the fluid. The design outer diameter of the internal tooth type spoiler is the same as the outer diameter of the test tube. The number of teeth inside is greater than or equal to 4. The internal-tooth-shaped spoiler is made of aluminum material and has a thickness of 2 mm.
The working principle of the invention is that the surfactant solution changes the initial Reynolds number entering the circular tube through the disturbance action of the internal tooth type disturbance device arranged at the inlet of the pipeline, thereby generating certain influence on the flowing state of the inlet solution. The development state of the solution turbulence is further determined by combining a certain length of test tube. Accelerating the conversion of the solution from laminar flow to turbulent flow; the range of Reynolds number of the transition zone is shortened; the length of the fully developed turbulent flow section is reduced; the experimental time is shortened; the experimental efficiency is improved; the requirement on the laboratory site is reduced; provides a convenient method for the resistance reduction experiment in the future.
The specific operation experimental process is as follows: preparing a surfactant solution with a certain concentration, adding compensating ions with a certain proportion into a water storage tank, heating by a heating rod in the water storage tank to set different temperature working conditions, switching on a power supply to enable a pump to start running, simultaneously opening a valve of one liquid separation chamber connected with a pipeline to enable fluid to be buffered in the liquid separation chamber, after the operation is about 10 minutes, completely filling the fluid into and out of the liquid separation chamber, closing the power supply, opening an exhaust valve to remove foams, standing for a period of time, restarting a water pump, and starting to record experimental data when the experimental device stably runs for about ten minutes. And changing different working conditions of temperature and surfactant concentration, repeating the experimental steps, collecting experimental data for multiple times, and performing data analysis and processing to obtain the drag reduction rate of the surfactant solution.
Wherein, the electric device circulating pump in the pipeline is a stainless steel centrifugal pump SBFX, an electromagnetic flowmeter YK-LDG-25S-M2F110PNL, a micro-pressure transmitter YK-305 and a stirring device which are all connected with a JXF1 type control box and control the electricity consumption through the JXF1 control box. The electromagnetic flowmeter is connected in series in the pipeline through a flange, the frequency of the pump is changed by controlling a motor on the pump through a frequency converter in the control box, so that the flow is changed, and the electromagnetic flowmeter reads the flow in real time; the micro differential pressure transmitter is connected with two pressure measuring holes with a distance of 1.2m in the test section through a thin hose, the distance between the first pressure measuring hole and the liquid inlet chamber is 2.7m, the distance between the second pressure measuring hole and the liquid outlet chamber is 0.3m, the differential pressure transmitter is connected with a pipeline in parallel, and the stirring device is arranged in the liquid storage tank and drives the stirrer to rotate through a motor.
Example (b):
a use method of a drag reduction experiment device for reducing a circular tube development turbulence section comprises the following steps:
the method comprises the following steps: selecting cetyl trimethyl ammonium chloride CTAC (molecular formula is C)16H33N(CH3)3CL, relative molecular mass 320); sodium salicylate (molecular formula C) as an auxiliary counter ion salt7H5NaO3The relative molecular weight is 160, wherein the surfactant and the counter-ion salt are analytically pure with the purity of more than 99 percent and are directly dissolved in tap water to prepare a solution. The mass ratio of CTAC and NaSal is 1:1, the research concentrations adopted in the research of the experimental research on the drag reduction of the surfactant are 20 ppm-70 ppm respectively, and the experimental temperature range is 15-50 ℃.
Step two: the prepared solution is added into the water storage tank and is conveyed into the liquid inlet pipeline 8 under the power action of the centrifugal pump 9, and meanwhile, the stop valve of the liquid inlet and separation chamber 5 connected with the liquid inlet pipeline 8 is opened to buffer the fluid in the liquid inlet and separation chamber and fill the liquid inlet and separation chamber.
Step three: and opening a foam discharging valve to discharge foam, standing for 10-15 minutes, restarting the circulating pump, and recording experimental data after the device stably operates for 10-15 minutes.
Step four: changing different working conditions of temperature and surfactant concentration, repeating the first step to the third step, and collecting multiple times of experimental data
Step five: the recorded flow and pressure drop are collated and analyzed and then processed through formula Cf=Π2d5Δp/32ρlQ2Obtaining the drag reduction ratio DR = (C)f water-Cf solution of）/Cf waterFig. 6-8 show that the change curve of the coefficient of friction resistance of water obtained from the collected data in the experiment is well matched with the Dean asymptote, the error range is (-6.7)% -7.0%, and the reliability of the measuring system after the baffle ring is installed is fully verified. And the calculated friction coefficient change curve and drag reduction rate curve graph is also provided.
The above description is only an embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the present invention.
Claims (7)
1. The utility model provides a reduce resistance reduction experimental apparatus of pipe development torrent section which characterized in that: including, the liquid reserve tank, the agitator, the test section, interior tooth type spoiler, the feed liquor cavity, go out the liquid cavity, the drain pipe, the feed liquor pipe, the circulating pump, the filter screen, the scum valve, little differential pressure transmitter, electromagnetic flowmeter, be provided with agitating unit in the liquid reserve tank, the liquid reserve tank sub-unit connection has the feed liquor pipe, the feed liquor pipe other end is connected to the feed liquor cavity, start circulating pump and electromagnetic flowmeter having set gradually on the feed liquor pipe from being close to liquid reserve tank one end, be provided with filter screen and scum valve in the feed liquor cavity, the test section is connected to the feed liquor cavity other end, the test section other end is connected to out the liquid cavity, the feed liquor cavity is provided with interior tooth type spoiler with the junction of test section, the one end that is close to out the liquid cavity on the test section is provided.
2. A use method of a resistance reduction experimental device for reducing a circular tube development turbulence section is characterized in that: the method comprises the following steps:
the method comprises the following steps: selecting a solution with the concentration of 10ppm-100ppm within the range of 1: 1-1: 1.5 by mass of the compensating ions and the surfactant;
step two: the power line on the circulating pump is communicated with an external socket and then starts to operate, the prepared solution is added into the water storage tank and is conveyed into the liquid inlet pipeline under the power action of the circulating pump, meanwhile, the stop valve of the liquid inlet and separating chamber connected with the liquid inlet pipeline is opened to enable the fluid to be buffered in the liquid inlet and separating chamber and to be filled in the liquid inlet and separating chamber, and after the operation is carried out for 10-15 minutes, the fluid is completely filled in the liquid inlet and separating chamber;
step three: opening a foam discharging valve to discharge foam, standing for 10-15 minutes, restarting a circulating pump, and recording experimental data after the device stably runs for 10-15 minutes;
step four: changing different working conditions of temperature and surfactant concentration, repeating the first step to the third step, and collecting multiple times of experimental data;
step five: the recorded flow and pressure drop are collated and analyzed and then processed through formula Cf=Π2d5Δp/32ρlQ2Obtaining the drag reduction ratio DR = (C)f water-Cf solution of）/Cf water。
3. The experimental device for reducing the drag reduction of the circular tube development turbulence section as claimed in claim 1, wherein: the filter screen divides the liquid inlet cavity into two sections near one end of the liquid inlet pipe and near the end of the testing section.
4. The experimental device for reducing the drag reduction of the circular tube development turbulence section as claimed in claim 1, wherein: the foam discharging valve is arranged above the liquid inlet cavity close to one end of the testing section and is 30-70 mm away from the connecting position of the liquid inlet cavity and the testing pipe.
5. The experimental device for reducing the drag reduction of the circular tube development turbulence section as claimed in claim 1, wherein: the electric device circulation, the electromagnetic flowmeter, the micro-pressure transmitter and the stirring device in the pipeline are all connected with the control box, the electricity consumption is controlled by the control box, the electromagnetic flowmeter is connected in the pipeline in series through a flange, the frequency of the pump is changed by controlling the motor on the pump through the frequency converter in the control box, the flow is further changed, and the electromagnetic flowmeter reads the flow in real time; the micro-differential pressure transmitter is connected with the testing section through a thin hose, and the stirring device is arranged in the liquid storage tank and drives the stirrer to rotate through the motor.
6. The experimental device for reducing the drag reduction of the circular tube development turbulence section as claimed in claim 1, wherein: the stirrer is an electric stirrer, and the main components are an impeller blade and a small motor.
7. The experimental device for reducing the drag reduction of the circular tube development turbulence section as claimed in claim 1, wherein: the liquid inlet cavity is internally provided with three independent small liquid separation cavities 1#, 2#, and 3#, and the liquid outlet cavity is internally provided with three independent small liquid separation cavities 1 ', 2 ', and 3 '; three stainless steel pipelines which correspond to the small liquid inlet cavity and the small liquid outlet cavity and have three different pipe diameters are sequentially connected in parallel, and one section of each stainless steel pipeline, which is close to the small liquid inlet cavity and the small liquid outlet cavity, is provided with a stop valve.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113865825A (en) * | 2021-09-26 | 2021-12-31 | 西南石油大学 | Multifunctional product oil turbulent flow resistance-reducing flow PIV loop experiment device and method |
| CN114397227A (en) * | 2022-01-21 | 2022-04-26 | 西南石油大学 | Polymer turbulence resistance reduction evaluation device and method under action of variable magnetic field |
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