CN102156085A - Method for detecting uniformity of multi-phase mixed flow field in chemical field - Google Patents
Method for detecting uniformity of multi-phase mixed flow field in chemical field Download PDFInfo
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- CN102156085A CN102156085A CN201010574398.1A CN201010574398A CN102156085A CN 102156085 A CN102156085 A CN 102156085A CN 201010574398 A CN201010574398 A CN 201010574398A CN 102156085 A CN102156085 A CN 102156085A
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Abstract
The invention discloses a method for detecting uniformity of a multi-phase mixed flow field in the chemical field. The method is mainly used for judging the effect of the fluid mixed flow field and theoretically guiding the design of experiments in chemical engineering experiments. The method comprises the following steps of: (1) acquiring a multi-phase stirred and mixed flow field velocity distribution graph by using a three-dimensional particle image velocimetry (3D-PIV); (2) performing scanning continuously from top to bottom or from left to right according to an S shape by using the velocity distribution graph acquired in the (1) to acquire a gray value time sequence of different color distribution, wherein the magnitude of the gray value represents the distribution of relative velocity magnitude of a section area of the flow field; (3) performing chaotic dynamical system detection on the time sequence of the relative velocity magnitude distribution acquired in the (2) by using a 0-1test method; and (4) judging whether the system is chaotic so as to judge the uniformity and the uniformity degree of the flow field. The method is simple and convenient, and has high practical value; and a reliable and practical detection method is provided for judging the effect of the mixed flow field and theoretically guiding the design of a stirring reactor in the chemical engineering experiments.
Description
Technical field
The present invention relates to technical field of chemical engineering, specifically a kind of method that is adapted to all fluid mixing flow field homogeneitys detections of chemical field.
Background technology
Mixing is with machinery or hydrokinetic method, two or more materials are disperseed mutually and reach the operation of certain degree of uniformity. wherein relate to fluid foods, belong to fluid dynamical process.The application that is blended in the Chemical Manufacture is very general, and its purpose mainly is: 1. prepare various uniform potpourris, as solution, emulsion, suspending liquid and pulpous state, pasty state or solid powder/particle mixture etc.; 2. provide good condition for some unit operations or chemical reaction process.When the preparation uniform mix, mixed effect is that the homogeneity that is reached is weighed with the mixability of potpourri.When quickening physics or chemical process, mixed effect is used the degree of mass transfer overall coefficient, heat transfer coefficient or reaction rate increase always and is weighed.The tolerance of the degree of uniformity that the dispersion that different material is reached through mixing is admixed.Mixability is relevant with the yardstick of being investigated.For different mixing modes and mixing apparatus being estimated and being compared, can select suitable form of presentation as the case may be.
The mixability of fluid system, available following three kinds of form of presentations:
1. degree of mixing well system on the whole, i.e. inhomogeneity tolerance in the equipment size scope.On average degree of the mixing well I of certain component is the arithmetic mean of the degree of mixing well of certain component of trying to achieve according to several samples in the same groove, can be in order to tolerance system mixed effect generally, but must indicate the quantity of institute's sample thief.
2. separate the tolerance of being disperseed the micelle size in the yardstick mixing system.In separating range scale, material be homogeneous phase or a kind of material only arranged.It is littler to separate yardstick, illustrates to mix more evenly.For immiscible system, can not reach the separation yardstick of molecular level.
3. separate the intensity inhomogeneity tolerance of system on small scale of dissolving each other.In the married operation process, what exist in the mixed liquor is the potpourri micelle of different sizes and variable concentrations.The difference of these potpourri micelle concentration and mean concentration is separated intensity exactly.It is littler to separate intensity, mixing of materials is described more fully, and the interface is fuzzyyer between micelle.When mixture had reached desirable admixture through molecular diffusion, when promptly reaching so-called molecular scale even, separating intensity was zero.In mixing apparatus, the effect of fluid bulk flow is to improve the degree of mixing well that mixes system, and the turbulent flow pulsation then reduces separates yardstick and separate intensity.Therefore adopt advanced means of testing and set up rational mathematical model and obtain velocity field, temperature field and concentration field in the tank diameter, and the method for taking effective measuring mixing effect of fluid, not only the optimal design to mixing apparatus has crucial economic implications, and the fundamental research of amplifying and mix is had the theory significance of reality.In recent years, along with development of science and technology, the widespread use of Laser Doppler Velocimeter LDV and Fluid Mechanics Computation CFD analogue technique and electron tomography imaging technique etc. has appearred, promoted the very fast development of fluid hybrid technology, just see at present, the method of weighing fluid mixing flow field effect is numerous, mainly contain electrical conductivity method, thermocouple method, optical method, decoloring method etc., wherein electrical conductivity method is used very wide in the mixing of low viscous flow body, but to the requirement height of agitated medium, as to require agitated medium be deionized water; Thermopair rule stream field can produce destruction; General optical method is used also less because device is complicated; Decoloring method is used for surveying highly viscous fluid and viscoelastic fluid is very effective, but owing to adopt naked eyes to judge, thereby have stronger subjectivity.If adopt classical largest Lyapunov exponent method to judge chaos, its check index can not judge whether chaos smaller or equal to 0 but might be chaos, cause the blind area in the judgement.
Summary of the invention
The objective of the invention is to overcome the deficiency of said method, provide a kind of have higher using value, simple and feasible, speed is fast, real-time is good, the inhomogeneity detection method of heterogeneous fluid mixing flow field in the adaptable chemical industry.
Technical scheme of the present invention is: utilize chaology to judge the Flow Field Distribution degree of uniformity, the occurring in nature chaos phenomenon is ubiquitous, therefore the present invention has introduced chaos thought and has checked the flow field velocity distributed degrees, the gray-scale value time series is extracted in the S shape scanning of carrying out for the flow field regions space continuity, satisfy the space uniform continuity on topological structure, the time series of using this method to obtain can effectively be represented certain mixing situation of whole flow region constantly.At present, chaology success be applied to the process of mixing, saved the energy, improved efficient.Concrete grammar is: (1) utilizes three-dimensional particle image velocimeter (3D-PIV) to obtain the heterogeneous flow field velocity distribution plan that mixes; (2) utilize the velocity profile of (1) gained to scan the gray-scale value time series of obtaining the different colours distribution according to S shape from top to bottom or from left to right continuously, the size distribution of this gray-scale value has been represented the distribution of this flow field cross section relative velocity size; (3) time series of the relative velocity size distribution of (2) gained being carried out Chaos dynamic system with the 0-1test method detects; (4) judge whether chaos, thereby judge the homogeneity and the degree of uniformity in flow field.
Degree of uniformity adopts the degree of closeness of detected value and 1 to judge that criterion is: be positioned at [0.7,0.8) in the interval, then be defined as general degree of uniformity; Be positioned at [0.8,0.95) in the interval, then be defined as medium degree of uniformity; Be positioned at [0.95,1) in the interval, then be defined as very degree of uniformity.
The invention has the beneficial effects as follows:
1, solved the weak point of traditional electrical conductivity method, thermocouple method, optical method, decoloring method;
2, this method simple possible, computing velocity is fast;
3, can judge effectively that the flow field mixes state, to a certain extent to DESIGN OF REACTOR with tested directive function;
The present invention is applied in the detection to all fluid mixing flow field effects, this method is simple and convenient, and have very high practical value, reach the design of instructing stirred reactor in theory, a kind of reliable and practical even flow field detection method is provided judging the mixing flow field effect in the chemical engineering experiment.
Description of drawings
Fig. 1 is the relative velocity transversal scanning figure in mixed process flow field
Fig. 2 is the relative velocity longitudinal scanning figure in mixed process flow field
Embodiment
Embodiment 1:
In certain reactor, the present is judged the heterogeneous velocity distribution of flow field situation of its internal reaction material, with particle image velocimeter (3D-PIV) its flow field figure is carried out track record, extract and mix instantaneous pattern, carrying out gray level image handles, utilize continuous from top to bottom the carrying out relative velocity scanning according to S shape and obtain time series of the gray value profiles of gained, again the gray-scale value time series of gained being carried out the 0-1test Chaos dynamic system detects, the transverse velocity field is carried out seasonal effect in time series from left to right and is extracted (as shown in Figure 1), the detected value of 0-1 chaos is 0.783, the longitudinal velocity field is carried out seasonal effect in time series from top to bottom and is extracted (as shown in Figure 2), the detected value of 0-1 chaos is 0.835 all to be positioned at [0.7,0.8) in the interval, then this moment, the flow field was general degree of uniformity; Detect once more after 15 minutes, the detected value of transverse velocity field 0-1 chaos is 0.855, the detected value of longitudinal velocity field 0-1 chaos be 0.835 be positioned at [0.8,0.95) in the interval, then this moment, the flow field was medium degree of uniformity; Detect once more after 60 minutes, the detected value of transverse velocity field 0-1 chaos is 0.956, and the detected value of longitudinal velocity field 0-1 chaos is 0.972, is positioned in [0.95,1] interval, and then this moment, the flow field was unusual degree of uniformity.
Claims (2)
1. inhomogeneity detection method of the heterogeneous mixing flow field of chemical field, it is characterized in that: this method adopts chaology and Chaotic Time Series Analysis method, and concrete steps are as follows: (1) utilizes three-dimensional particle image velocimeter (3D-PIV) to obtain the heterogeneous flow field velocity distribution plan that mixes; (2) utilize the velocity profile of (1) gained to scan the gray-scale value time series of obtaining the different colours distribution according to S shape from top to bottom or from left to right continuously, the size distribution of this gray-scale value has been represented the distribution of this flow field cross section relative velocity size; (3) time series of the relative velocity size distribution of (2) gained being carried out Chaos dynamic system with the 0-1test method detects; (4) judge whether chaos, thereby judge the homogeneity and the degree of uniformity in flow field.
2. the inhomogeneity detection method of the heterogeneous mixing flow field of chemical field according to claim 1, it is characterized in that: degree of uniformity adopts the degree of closeness of detected value and 1 to judge, criterion is: be positioned at [0.7,0.8) in the interval, then defining the flow field is general degree of uniformity; Be positioned at [0.8,0.95) in the interval, then be defined as medium degree of uniformity; Be positioned at [0.95,1) in the interval, then be defined as very degree of uniformity.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103279433A (en) * | 2013-05-02 | 2013-09-04 | 昆明理工大学 | Method and device for representing particle aggregation bodies |
| CN105067621A (en) * | 2015-08-17 | 2015-11-18 | 云南财经大学 | Method for judging multi-phase mixing uniformity |
| CN110006735A (en) * | 2019-06-03 | 2019-07-12 | 湖南乐准智芯生物科技有限公司 | A kind of mixing state identification method and system |
| CN112100944A (en) * | 2020-09-24 | 2020-12-18 | 华东交通大学 | CFD simulation and PIV measurement-based anaerobic digestion flow field visualization method under multi-scale condition and application |
| CN112669268A (en) * | 2020-12-21 | 2021-04-16 | 昆明理工大学 | Method, system and terminal for evaluating distribution uniformity of multiphase mixed concentration field |
| CN113433038A (en) * | 2021-05-31 | 2021-09-24 | 昆明理工大学 | Novel method for selecting mixed nano fluid particle combination |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101650292A (en) * | 2009-09-02 | 2010-02-17 | 昆明理工大学 | Method for measuring mixing effect of fluid |
| CN101750152A (en) * | 2009-12-17 | 2010-06-23 | 昆明理工大学 | Method for representing and diagnosing combustion instability |
| CN101813641A (en) * | 2010-05-11 | 2010-08-25 | 昆明理工大学 | Method for verifying homogeneous state and degree of multiphase stirring and mixing |
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| CN101650292A (en) * | 2009-09-02 | 2010-02-17 | 昆明理工大学 | Method for measuring mixing effect of fluid |
| CN101750152A (en) * | 2009-12-17 | 2010-06-23 | 昆明理工大学 | Method for representing and diagnosing combustion instability |
| CN101813641A (en) * | 2010-05-11 | 2010-08-25 | 昆明理工大学 | Method for verifying homogeneous state and degree of multiphase stirring and mixing |
Non-Patent Citations (1)
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| 《油气田地面工程》 19941231 陆耀军等 重力式油水分离设备内流场的PIV技术测试 第13卷, 第06期 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103279433A (en) * | 2013-05-02 | 2013-09-04 | 昆明理工大学 | Method and device for representing particle aggregation bodies |
| CN103279433B (en) * | 2013-05-02 | 2015-11-18 | 昆明理工大学 | A kind of method of characterizing particles aggregate and device |
| CN105067621A (en) * | 2015-08-17 | 2015-11-18 | 云南财经大学 | Method for judging multi-phase mixing uniformity |
| CN110006735A (en) * | 2019-06-03 | 2019-07-12 | 湖南乐准智芯生物科技有限公司 | A kind of mixing state identification method and system |
| CN112100944A (en) * | 2020-09-24 | 2020-12-18 | 华东交通大学 | CFD simulation and PIV measurement-based anaerobic digestion flow field visualization method under multi-scale condition and application |
| CN112100944B (en) * | 2020-09-24 | 2022-05-24 | 华东交通大学 | CFD simulation and PIV measurement-based anaerobic digestion flow field visualization method under multi-scale condition and application |
| CN112669268A (en) * | 2020-12-21 | 2021-04-16 | 昆明理工大学 | Method, system and terminal for evaluating distribution uniformity of multiphase mixed concentration field |
| CN113433038A (en) * | 2021-05-31 | 2021-09-24 | 昆明理工大学 | Novel method for selecting mixed nano fluid particle combination |
| CN113433038B (en) * | 2021-05-31 | 2022-11-01 | 昆明理工大学 | Novel selection method of mixed nano fluid particle combination |
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Application publication date: 20110817 |