CN104155362A - Ultrasound imaging technology based method for detecting flow pattern of gas-liquid two-phase flow in micro channel - Google Patents

Ultrasound imaging technology based method for detecting flow pattern of gas-liquid two-phase flow in micro channel Download PDF

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Publication number
CN104155362A
CN104155362A CN201410398070.7A CN201410398070A CN104155362A CN 104155362 A CN104155362 A CN 104155362A CN 201410398070 A CN201410398070 A CN 201410398070A CN 104155362 A CN104155362 A CN 104155362A
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China
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micro channel
flow pattern
microchannel
ultrasonic
data
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CN201410398070.7A
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许兆林
孙东科
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Southeast University
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Southeast University
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Priority to CN201410398070.7A priority Critical patent/CN104155362A/en
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Abstract

The invention discloses an ultrasound imaging technology based method for detecting flow pattern of a gas-liquid two-phase flow in a micro channel. The method comprises the following steps: tracer particles are spread in the fluid to be detected in the micro channel, and an ultrasonic probe is arranged on the outer side of the micro channel; ultrasonic equipment generates an excitation signal to trigger all ultrasound unit arrays of the ultrasonic probe to transmit ultrasonic row by row in a measurement area of the micro channel to be detected, and the ultrasonic probe receives scattering RF signals in the micro channel to be detected; the radio frequency signals are converted into RF data; the RF data is extracted to generate a particle image in gray model, and the flow pattern of gas-liquid two-phase flow in the micro channel is obtained through the particle image. Compared with the prior art, the invention adopts linear array ultrasonic probe for scanning the flow field to be detected column by column, and the ultrasound resolution is much higher than that of other forms of ultrasonic probes. The signals received by the ultrasound probe is processed, and the particle image in gray model is generated, so as to obtain the flow pattern of gas-liquid two-phase flow in the micro channel; and flow pattern in the micro channel can be detected more comprehensively.

Description

Flow pattern of gas-liquid two-phase flow detection method in microchannel based on ultrasonic imaging technique
Technical field
The present invention relates to a kind of flow pattern of gas-liquid two-phase flow detection method in microchannel that is applied to.
Background technology
Biphase gas and liquid flow is extensively present in the industrial processes such as nature and power, chemical industry, nuclear energy.Biphase gas and liquid flow is stressed and the impact of the factor such as flow can form different flow patterns, and flow pattern has larger impact to the flow characteristics of biphase gas and liquid flow and Heat and Mass Transfer Characteristics.According to the conditions such as characteristic distributions of face shaping and phase, the flow pattern of biphase gas and liquid flow can be divided into bubble flow, slug flow, slug flow and annular flow etc.
Along with developing rapidly of micro-processing technology, commercial unit presents microminiaturized trend gradually.Gas-liquid two-phase current system in microchannel extensively appears in commercial production and people's life, along with reducing of passage internal diameter, in microchannel, the flow characteristics of the flow characteristics of biphase gas and liquid flow and conventional pipeline two-phase flow has larger difference, and this makes the detection means of flow pattern in conventional pipeline can not perform well in the detection of flow pattern of gas-liquid two-phase flow in microchannel.
Ultrasonic frequency band range is wide, is applicable to detecting from nanometer to millimetre-sized particle, ultrasonic technique can be applied in the detection of flow pattern of gas-liquid two-phase flow in microchannel.For this reason, the present invention has designed a kind of method that in microchannel, flow pattern of gas-liquid two-phase flow detects that is applied to.
Summary of the invention
The present invention is directed to above-mentioned the deficiencies in the prior art, a kind of flow pattern of gas-liquid two-phase flow detection method in microchannel that is applied to is provided.
For achieving the above object, the technology used in the present invention solution is:
In microchannel based on ultrasonic imaging technique, a flow pattern of gas-liquid two-phase flow detection method, is characterized in that, step is as follows:
The first step, in the inner fluid of microchannel to be measured, scatter trace particle, and at microchannel arranged outside ultrasonic probe;
Second step, by computer module, control the ultrasonic device that is connected with ultrasonic probe and produce pumping signal, the measured zone of all ultrasound unit arrays that trigger described ultrasonic probe in microchannel to be measured transmitting ultrasound wave by column, and by ultrasonic probe, receive trace particle in microchannel to be measured and produce backscattering radiofrequency signal after by ultrasonic irradiation;
The 3rd step, the radiofrequency signal that described ultrasonic probe is received are converted to rf data;
The 4th step, the described rf data of extraction, according to combining according to time sequencing, generate the particle picture of grayscale mode by the several radio frequencies that obtain, and by particle picture, draws flow pattern of gas-liquid two-phase flow in microchannel.
Described trace particle is good and contrast agent microbubble or the solid particle larger with surrounding fluid acoustic impedance difference of followability.
The 3rd described step is completed by signal processing module, wherein signal processing module is comprised of amplifier, time gain compensation and analog to digital conversion, described amplifier is for amplifying described radiofrequency signal, and described digital-to-analog conversion converts the radiofrequency signal through amplifying to rf data.
The generation method of described particle picture is as follows:
Import described rf data;
Find separation between each two field picture and the acoustic beam in every two field picture;
Use Hilbert transform to find envelope, obtain analytic signal;
Parameter to image arranges, and then described analytic signal is carried out to log-transformation, then data is converted into gray scale rank, and the row interpolation of going forward side by side improves image definition, finally data is shown as to image.
The particle picture of described the 4th step is by being completed by software module, wherein software module is comprised of data processing module and image generation module, first described data processing module imports described rf data from file, then find separation between each two field picture and the acoustic beam in every two field picture, finally use Hilbert transform (Hilbert Transform) to find envelope, obtain analytic signal, first described image generation module arranges the parameter of image, then described analytic signal is carried out to log-transformation, then data are converted into gray scale rank, the row interpolation of going forward side by side improves image definition, finally data are shown as to image.
When carrying out image acquisition, the row in the echo signal form ultrasonoscopy that first one group of cell array in ultrasonic probe reflects at the trace particle described in measured zone produces ultrasound wave reception.Then next is organized new cell array and according to which continuation sampling, generates the secondary series of ultrasonoscopy, scans successively, until the complete microchannel to be measured of all ultrasound unit array scannings with the same manner.Finally, the sweep trace obtaining is combined according to the time sequencing of sampling, obtain opening and closing and become ultrasonic particle picture.
When flow pattern of gas-liquid two-phase flow detects in carrying out microchannel, first in the inner fluid of microchannel to be measured, scatter trace particle, the ultrasonic device of then controlling by computer module produces pumping signal, triggers ultrasonic probe transmitting ultrasound wave.Trace particle in flow field to be measured produces backscattering radiofrequency signal and is received by ultrasonic probe after by ultrasonic irradiation.The voltage signal that the ultrasonic radiofrequency signal that ultrasonic device receives produces is finally stored as rf data by data memory module through signal processing module conversion.Software module is extracted rf data and is rebuild the particle picture that generates grayscale mode.By particle picture, can draw flow pattern of gas-liquid two-phase flow in microchannel.
Beneficial effect of the present invention:
1, ultrasonic frequency band range is wide, can realize flow pattern in microchannel and detect;
2, adopt linear array ultrasonic probe to scan by column flow field to be measured, its ultrasonic resolution is far away higher than the ultrasonic probe of other form;
3, the penetrability of ultrasound wave in medium is stronger, can detect flow pattern in opaque microchannel;
4, ultrasonic probe low price and have stronger contamination resistance, can be directly installed on outside microchannel, realizes non-cpntact measurement, does not affect in microchannel and flows;
5, ultrasonic probe can be arranged on diverse location outside microchannel, can more comprehensively detect the flow pattern in microchannel.
Accompanying drawing explanation
Fig. 1 the present invention is based on flow pattern of gas-liquid two-phase flow recognition system figure in the microchannel of ultrasonic imaging technique.
In figure, 1. computing machine; 2. ultrasonic device; 3. signal processing module; 4. memory module; 5. ultrasonic probe; 6. microchannel import; 7. microchannel; 8. trace particle; 9. microchannel outlet.
Embodiment
Below in conjunction with accompanying drawing explanation and embodiment, the present invention is further described.
As shown in Figure 1, flow pattern of gas-liquid two-phase flow pick-up unit in a kind of microchannel based on ultrasonic imaging technique.Comprise computing machine 1, ultrasonic device 2, ultrasonic probe 5, trace particle 8, signal processing module 3, data memory module 4 and software module.Computing machine 1 is connected with ultrasonic device 2 by data line, ultrasonic device 2 is connected with ultrasonic probe 5, and ultrasonic probe 5 is placed in outside microchannel 7, and trace particle 8 is distributed in the interior liquid in microchannel 7, ultrasonic device 2 is also connected with signal processing module 3, and signal processing module 3 is connected with data memory module 4.
When flow pattern of gas-liquid two-phase flow detects in carrying out microchannel, first in 7 inner fluids of microchannel to be measured, scatter trace particle 8, then by computing machine 1, control ultrasonic device 2 and produce pumping signal, trigger ultrasonic probe 5 transmitting ultrasound waves.Trace particle 8 in flow field to be measured is produced backscattering radiofrequency signal and is received by ultrasonic probe 5 after ultrasonic irradiation.
When carrying out image acquisition, first one group of cell array in ultrasonic probe 5 produces ultrasound wave and receives the row in the echo signal form ultrasonoscopy of trace particle 8 reflections in measured zone.Then next is organized new cell array and according to which continuation sampling, generates the secondary series of ultrasonoscopy, scans successively, until the complete microchannel 7 to be measured of all ultrasound unit array scannings with the same manner.The voltage signal that the ultrasonic radiofrequency signal that ultrasonic device 2 receives produces is finally stored as rf data by described data memory module 4 through signal processing module 3 conversions.Software module is extracted rf data, and the sweep trace obtaining is combined according to the time sequencing of sampling, obtains opening and closing and becomes ultrasonic particle picture.By particle picture, can draw flow pattern of gas-liquid two-phase flow in microchannel.

Claims (4)

1. a flow pattern of gas-liquid two-phase flow detection method in the microchannel based on ultrasonic imaging technique, is characterized in that, step is as follows:
The first step, in the inner fluid of microchannel to be measured, scatter trace particle, and at microchannel arranged outside ultrasonic probe;
Second step, the ultrasonic device being connected with ultrasonic probe by computer control produce pumping signal, the measured zone of all ultrasound unit arrays that trigger described ultrasonic probe in microchannel to be measured transmitting ultrasound wave by column, and by ultrasonic probe, receive trace particle in microchannel to be measured and produce backscattering radiofrequency signal after by ultrasonic irradiation;
The 3rd step, the radiofrequency signal that described ultrasonic probe is received are converted to rf data;
The 4th step, the described rf data of extraction, combine the rf data obtaining according to time sequencing, generate the particle picture of grayscale mode, by particle picture, draws flow pattern of gas-liquid two-phase flow in microchannel.
2. flow pattern detection method according to claim 1, is characterized in that, described trace particle is good and contrast agent microbubble or the solid particle larger with surrounding fluid acoustic impedance difference of followability.
3. flow pattern detection method according to claim 1, it is characterized in that, the 3rd described step is completed by signal processing module, wherein signal processing module is comprised of amplifier, time gain compensation and analog to digital conversion, described amplifier is for amplifying described radiofrequency signal, and described digital-to-analog conversion converts the radiofrequency signal through amplifying to rf data.
4. flow pattern according to claim 1 detects dress method, it is characterized in that, the generation method of described particle picture is as follows:
Import described rf data;
Find separation between each two field picture and the acoustic beam in every two field picture;
Use Hilbert transform to find envelope, obtain analytic signal;
Parameter to image arranges, and then described analytic signal is carried out to log-transformation, then data is converted into gray scale rank, and the row interpolation of going forward side by side improves image definition, finally data is shown as to image.
CN201410398070.7A 2014-08-14 2014-08-14 Ultrasound imaging technology based method for detecting flow pattern of gas-liquid two-phase flow in micro channel Pending CN104155362A (en)

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CN105222861A (en) * 2015-09-01 2016-01-06 中国计量学院 A kind of method based on speeds match spectrometry biphase gas and liquid flow phase interface location
CN107361791A (en) * 2017-07-21 2017-11-21 北京大学 A kind of rapid super-resolution blood flow imaging method
CN107669334A (en) * 2017-10-31 2018-02-09 天津大学 Ultrasound RF ablation temperature imaging method based on ultrasonic wave backscattered energy
CN107991384A (en) * 2017-12-21 2018-05-04 浙江启尔机电技术有限公司 The detection device and method of flow pattern of gas-liquid two-phase flow in a kind of micro-pipe
CN111721672A (en) * 2020-05-29 2020-09-29 浙江理工大学 Multiphase test method based on Doppler and sonar image technology

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Publication number Priority date Publication date Assignee Title
CN105222861A (en) * 2015-09-01 2016-01-06 中国计量学院 A kind of method based on speeds match spectrometry biphase gas and liquid flow phase interface location
CN105222861B (en) * 2015-09-01 2018-08-21 中国计量学院 A method of based on speeds match spectrometry biphase gas and liquid flow phase interface location
CN107361791A (en) * 2017-07-21 2017-11-21 北京大学 A kind of rapid super-resolution blood flow imaging method
CN107669334A (en) * 2017-10-31 2018-02-09 天津大学 Ultrasound RF ablation temperature imaging method based on ultrasonic wave backscattered energy
CN107669334B (en) * 2017-10-31 2020-06-16 天津大学 Ultrasonic radio frequency ablation temperature imaging device based on ultrasonic backscattering energy
CN107991384A (en) * 2017-12-21 2018-05-04 浙江启尔机电技术有限公司 The detection device and method of flow pattern of gas-liquid two-phase flow in a kind of micro-pipe
CN107991384B (en) * 2017-12-21 2023-10-13 浙江启尔机电技术有限公司 Device and method for detecting flow pattern of gas-liquid two-phase flow in microtubule
CN111721672A (en) * 2020-05-29 2020-09-29 浙江理工大学 Multiphase test method based on Doppler and sonar image technology
CN111721672B (en) * 2020-05-29 2023-02-21 浙江理工大学 Multiphase test method based on Doppler and sonar image technology

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Application publication date: 20141119