Air suspension thermophysical property oscillation measuring device and measuring method thereof

Abstract

The invention discloses a gas suspension thermophysical property oscillation measuring device and a measuring method thereof. The measuring device comprises a cavity, an optical platform, a furnace cover, a first gas guide pipe joint, a second gas guide pipe joint, an oscillation horn, a gas guide mouthpiece, a density light source, a density camera, a viscosity light source, a viscosity camera, a nozzle, an oscillation input joint, a gas suspension gas input joint and a chassis. The device has the beneficial effects that the oscillation horn is communicated with the nozzle through the gas circuit, the oscillation effect of exciting melt resonance is realized by adjusting the vibration frequency and amplitude of the horn, the device has the function of simulating a material to test the melt thermophysical property in an oscillation ultrahigh-temperature environment, the problem that the oscillation thermophysical property of a high-temperature material is difficult to measure is solved, and the device is suitable for large-scale popularization and application. Meanwhile, the viscosity camera and the density camera which are operated are matched, so that a change parameter image of the heating material in an oscillation state can be conveniently obtained.

Description

Technical Field

[0001] The present invention relates to the field of high-temperature thermophysical property testing equipment, and particularly to an air suspension thermophysical property oscillation measurement device and a measurement method thereof, which is an oscillating air suspension heating furnace for realizing thermophysical property measurement through gas oscillation. Background Art

[0002] Air suspension technology is a technology for "containerless" preparation of new materials. By enabling materials to achieve stable suspension in a specific air flow field, it can effectively avoid the pollution and limitation of the container to the materials. This technology has been widely applied in the fields of new material preparation, rapid solidification, and research on the structure of high-temperature melts. However, most of the existing air suspension heating furnaces can only complete the operations of suspending, heating, and melting materials in a relatively stable air flow environment, and can only observe the sample preparation process and measure the melt density, but it is difficult to realize the surface tension and viscosity tests in the melt state. For the research on the solidification mechanism of materials and the preparation of new materials, high-temperature surface tension and viscosity parameters are extremely crucial. At the same time, in order to cooperate with the electrostatic suspension thermophysical property measurement device operating in orbit, a thermophysical property measurement device that can simulate the microgravity environment on the ground is required. Based on this, there is an urgent need for a device that can apply controllable oscillation in a high-temperature suspension environment and measure key indicators such as the viscosity and density of materials in real time to meet the research needs of material characteristics in high-temperature and deep undercooling environments.

[0003]

Object of the Invention

[0004] To achieve the above object, the present invention provides an air suspension thermophysical property oscillation measurement device, including: 1. Chamber: A chassis is provided at the bottom inside the chamber; 2. Nozzle: Installed at the middle position of the chassis, used to provide an upward suspension air flow for heating materials; 3. Oscillation horn: Communicated with the inside of the air outlet space of the nozzle through at least one gas pipeline, used to superimpose a controllable oscillation signal on the air flow; 4. Oscillation input joint: Arranged on both sides of the nozzle, connected to the gas guiding nozzle of the oscillation horn, and used for gas oscillation input through an external oscillation device or the vibration of the horn itself; 5. Light source and camera measurement system: The annular surface of the cavity is provided with a density light source and a density camera, a viscosity light source and a viscosity camera, which cooperate with external analysis equipment to obtain images and data of the material under oscillating conditions, so as to obtain thermal property parameters such as viscosity and density; the density camera uses 1300 - 200um, the frame rate is 203fps, and the resolution is 1.3MP; the viscosity camera uses 640 - 750um, the frame rate is 2000fps, and the resolution is 0.3MP; 6. Optical platform and furnace lid: Multiple flange tubular optical platforms are distributed around the furnace opening, on which laser heaters or other testing instruments can be installed; a furnace lid is sealed at the furnace opening to maintain the controllability of the internal environment.

[0005] A measuring method for an air suspension thermal property oscillation measuring device, characterized in that: the specific measuring method includes the following steps: Step 1: Connect a vacuum system inside the cavity to ensure the stability of the internal vacuum environment during the experiment. The vacuum system includes a vacuum cavity, a molecular pump, a mechanical pump, and a full-range vacuum gauge; Step 2: Use the laser heating and temperature control system to control the temperature and heat the suspended sample: Real-time control of the laser power is achieved through PID feedback control to achieve automatic temperature control, and the temperature control accuracy is better than 0.2%; Step 3: Observe and collect sample changes: Through the real-time observation and collection system, observe the postures of the sample during heating, melting, and solidification in real time, and collect the radius changes of the sample during solidification and oscillation. The system includes an observation camera, two high-speed cameras, and two light sources; Step 4: Forced vibration of the molten sample: Under the action of the oscillation suspension and oscillation system, control the air flow size through a flow meter and apply a specific frequency and amplitude to the air flow by a speaker to make the molten sample vibrate forcedly, and the frequency adjustment range is 0 - 500Hz, and the air flow adjustment range is 0 - 3L. The system includes a flow meter, a speaker, and an air circuit; Step 5: Transmit the observed and collected image data information to the human-computer interaction system for processing, analysis, and calculation: The human-computer interaction system is developed based on Visual Studio and LabView, including a control system that integrates laser power control, air flow control, oscillation control, and temperature control, and an analysis system for processing image information and data fitting; Specific processing, analysis, and calculation: A. The pixels collected by the density camera and the oscillation camera are converted into the radius information of the melt, and the change of the melt radius with temperature and the change of the radius during the oscillation decay process are calculated and fitted through a mathematical model, so as to calculate the density, viscosity, and surface tension of the melt; B. The surface tension and viscosity coefficient of the melt are calculated through the decay time and oscillation frequency of the droplet oscillation; With the above structure, the present invention can apply adjustable oscillation to the suspended material and complete the acquisition of thermal property data in an oscillating environment, overcoming the limitation of the prior art that cannot perform oscillating simulation tests on materials. Beneficial effects

[0006] 1. Adjustable oscillation environment: By using the combination of an oscillation horn and a nozzle, the sample can be kept suspended at high temperature and oscillation can be applied to promote the resonance of the molten sample. 2. Real-time measurement of viscosity and density: With the help of a density camera, a viscosity camera and a light source, the radius change of the material during the resonance decay process can be accurately obtained and parameters can be calculated. 3. Multifunctional measurement: The optical platform can be installed with a laser heater or other measuring instruments to achieve rapid heating at high temperature and multi-angle observation. 4. Applicable to various gas environments: Oxygen, argon, nitrogen and methane can be respectively connected through the first gas pipe joint and the second gas pipe joint to realize the thermal property test under different atmosphere conditions. Description of the drawings

[0007] · Figure 1 is a three-dimensional schematic diagram of the overall structure of the present invention; · Figure 2 is a schematic diagram of the structure of the cavity connection of the present invention; · Figure 3 is a schematic diagram of the connection between the nozzle and the chassis of the present invention; · Figure 4 is a schematic diagram of the structure of the oscillation horn of the present invention; · Figure 5 is the vibration waveform diagram of the operation of the oscillation horn of the present invention; · Figure 6 is a flowchart of image processing; · Figure 7 is the calculation formula for the surface tension and viscosity coefficient of the melt; · Figure 8 is the calculation formula for density, viscosity and surface tension; · Figure 9 is a molten body photo collected by the density camera and the viscosity camera.

[0008] Corresponding relationship of the reference numerals in the figures: 1, cavity; 2, optical platform; 3, furnace cover; 4, first gas pipe joint; 5, second gas pipe joint; 6, oscillation horn; 610, gas guide nozzle; 7, density light source; 8, density camera; 9, viscosity light source; 10, viscosity camera; 11, nozzle; 1101, oscillation input joint; 1102, air suspension gas input joint; 12, chassis. Detailed implementation manners

[0009] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. Embodiment

[0010] As Figures 1-4 shown, a gas suspension thermal property oscillation measurement device includes a cavity 1. A chassis 12 is provided at the bottom inside the cavity 1 for receiving and fixing a nozzle 11. An air outlet is provided at the upper part of the nozzle 11, and a material sample is suspended in the suspension area inside the cavity through an air flow.

[0011] Two oscillation input joints 1101 are arranged on both sides of the nozzle 11, and the two are respectively connected to two air guide nozzles 610 on the same oscillation horn 6 through conduits (as Figure 4 shown). At the same time, the air path is transferred through a second air duct joint 5 in the middle of the conduit. When the oscillation horn 6 operates, gas will enter the air outlet space of the nozzle 11 at a specific frequency or intensity, thereby applying a vibration effect to the suspended sample.

[0012] An air suspension gas input joint 1102 is further provided on the nozzle 11. This joint is connected to a first air duct joint 4 through a conduit, and the latter can be connected to an external protective gas output device. By adjusting the flow rate and type of the external gas source, different gas environments and different suspension air flow speeds can be formed.

[0013] A plurality of optical platforms 2 are distributed around the furnace opening at the top end of the cavity 1. Each optical platform 2 is a flange tubular structure and can be respectively installed with, for example, a laser heater, an optical fiber temperature measuring instrument or other detectors as needed; In this embodiment, two optical platforms 2 at symmetric positions are selected and equipped with laser heaters for directionally heating, warming up or maintaining the temperature of the suspended material.

[0014] To maintain the seal and cleanliness inside the cavity, a furnace cover 3 is hermetically installed at the furnace opening at the top end of the cavity 1.

[0015] Combined with Figure 5 and Figure 6 shown, in terms of the measurement system, two sets of light source-camera systems are arranged on the annular surface of the cavity 1: one set is a density light source 7 and a density camera 8; the other set is a viscosity light source 9 and a viscosity camera 10. They respectively observe from two mutually orthogonal or symmetric directions and are connected to an external analysis device through data lines; the high-speed camera can capture information such as the deformation and surface contour change of the material in the oscillation and high-temperature environment, and then calculate thermal property parameters such as the density and viscosity of the material.

[0016] Combined with Figure 7 、 Figure 8 and Figure 9 shown, when in actual use: · First, place the material sample above the air outlet of the nozzle 11, and adjust the appropriate air flow through an external air source to keep the sample in a stable air suspension state; · If high-temperature testing is required, turn on the laser heater and heat the sample to the specified temperature range; · Connect and adjust the oscillating horn 6 to allow the air flow with a specific oscillation frequency to enter the inside of the nozzle seat 11, thereby exciting the resonance of the upper melt sample; · Finally, collect video image data through the viscosity camera 10 and the density camera 8 respectively, and calculate the deformation and parameters of the sample under different oscillation frequencies and different temperature conditions with the help of external analysis software.

[0017] The present invention can apply adjustable oscillations to the material in a high-temperature suspension state, obtain data on the changes in thermal properties such as viscosity and density of the material in a high-temperature environment by exciting the resonance of the melt, and has the advantages of diverse testing means, a wider simulation range, and stronger operability.

Claims

1. A gas suspension thermal property oscillation measurement device, comprising a cavity (1) and an oscillation horn (6), characterized in that: A chassis (12) is provided at the inner bottom of the cavity (1), and a nozzle (11) is installed at the middle position of the top of the chassis (12); Oscillation input joints (1101) are provided on both sides above the nozzle (11), and the two oscillation input joints (1101) are respectively connected to two air guiding nozzles (610) on the same oscillation horn (6) through conduits, wherein the oscillation frequency range of the oscillation horn (6) is 0 - 500 Hz; A density light source (7) and a density camera (8) are respectively installed at a symmetric position on the annular surface of the cavity (1), and a viscosity light source (9) and a viscosity camera (10) are respectively installed at another symmetric position on the annular surface of the cavity (1), for obtaining thermal property data of the material in the oscillation state; A plurality of optical platforms (2) are distributed around the furnace opening at the top end of the cavity (1); A furnace cover (3) is hermetically installed at the furnace opening at the top end of the cavity (1).

2. The aerostatic thermal property oscillation measurement device according to claim 1, characterized in that: The conduit part between the oscillation input joint (1101) and the air guiding nozzle (610) is communicated and connected to a second gas pipe joint (5).

3. The air suspension thermal property oscillation measurement device according to claim 1, characterized in that: An air suspension gas input joint (1102) is further provided on the nozzle (11), and the air suspension gas input joint (1102) is connected to a first gas pipe joint (4) through a conduit to convey a protective gas or other gas to the nozzle (11), and the air flow range is 0 - 3 L.

4. The aerostatic thermal property oscillation measurement device according to claim 1, characterized in that: Laser heaters are installed on both of the two optical platforms (2) at the symmetric positions, and the laser power range is 0 - 180 W, for high-temperature heating or heat preservation of the sample.

5. The aerostatic thermal property oscillation measurement device according to claim 1, wherein: The density camera (8) and the viscosity camera (10) are respectively connected to an external analysis device through data lines, and image data of the material under different oscillation intensities are obtained.

6. The aerostatic thermal property oscillation measurement device according to claim 1, characterized in that: The optical platform (2) is of a flange tubular structure, and test devices with different functions can be replaced or disassembled according to test requirements.

7. The aero-levitation thermal property oscillation measurement device according to claim 1, wherein: The furnace cover (3) is detachable or openable and is hermetically fitted with the cavity (1) to maintain the stability of the atmosphere inside the cavity.

8. A measurement method of an air suspension thermal property oscillation measurement device obtained according to the air suspension thermal property oscillation measurement device described in claims 1-7, characterized in that: The specific measurement method includes the following steps: Step 1: A vacuum system is connected to the inside of the cavity to ensure the stability of the internal vacuum environment during the experiment, wherein the vacuum system includes a vacuum cavity, a molecular pump, a mechanical pump and a full-range vacuum gauge; Step 2: Use a laser heating and temperature control system to control the temperature of the suspended sample: Real-time control of the laser power is achieved through PID feedback control to achieve automatic temperature control, and the temperature control accuracy is better than 0.2%; Step 3: Observe and collect the changes of the sample: The postures of the sample during heating, melting and solidification are observed in real time through a real-time observation and collection system, and the radius changes of the sample during solidification and oscillation are collected; Step 4: Forced vibration of the molten sample: Under the action of the oscillation suspension and oscillation system, the air flow size is controlled by a flowmeter and a specific frequency and amplitude are applied to the air flow by a loudspeaker, so that the molten sample undergoes forced vibration, and the frequency adjustment range is 0 - 500 Hz, and the air flow adjustment range is 0 - 3 L, wherein the system includes a flowmeter, a loudspeaker and an air circuit; Step 5: Transmit the observed and acquired image data information to the human-computer interaction system for processing, analysis, and calculation. The human-computer interaction system is developed based on Visual Studio and LabView, including a control system that integrates laser power control, gas flow control, oscillation control, and temperature control, and an analysis system for processing image information and data fitting. Specific processing, analysis, and calculation: A. Convert the pixels collected by the density camera and the oscillation camera into the radius information of the melt, and calculate and fit the change of the melt radius with temperature and the change of the radius during the oscillation decay process through a mathematical model, so as to calculate the density, viscosity, and surface tension of the melt. B. Calculate the surface tension and viscosity coefficient of the melt through the decay time and oscillation frequency of the droplet oscillation. Step 6: Obtain the measurement data results and discuss and analyze the thermal physical properties of the sample.

9. The measuring method of an air suspension thermal property oscillation measuring device according to claim 8, characterized in that: The real-time observation and acquisition system in Step 3 includes an observation camera, two high-speed cameras, and two light sources.

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