A system for observing bouncing behavior of dust-containing liquid droplets impacting a wall surface

Abstract

The present application provides a kind of dust-containing droplet impact wall bounce behavior observation system, it is related to bounce behavior observation field;The observation system includes: particle generator, environment bin, displacement control unit and observation unit;Particle generator emits particle gas flow;Solid wall is arranged in the inside of environment bin, and environment bin makes the particle gas flow entering into change into dust-containing droplet;Displacement control unit emits at least two laser beams to environment bin, and makes laser converge to form optical trap;Optical trap is used to capture dust-containing droplet;Displacement control unit adjusts the movement speed and movement direction of the dust-containing droplet captured, to control the dust-containing droplet captured to collide with solid wall at set speed and set direction;Observation unit carries out real-time observation to the movement track of dust-containing droplet colliding with solid wall at set speed and set direction;The present application can realize the observation to the bounce behavior of dust-containing droplet impacting wall.

Description

Technical Field

[0001] This invention relates to the field of bouncing behavior observation, and in particular to a system for observing the bouncing behavior of dust-laden droplets impacting a wall. Background Technology

[0002] Heterogeneous particle aggregation is widespread in nature and in industrial life. For example:

[0003] (1) Rainfall process in nature. Water vapor in clouds condenses on the surface of particles to form droplets. When the droplets reach a certain size, they fall and form rain.

[0004] (2) In the particle condensation counter (CPC), nanoparticles cannot be detected by optical means due to their small particle size. Heterogeneous condensation technology is used to make saturated steam condense on the particle surface first, so that the particle size becomes larger and can be detected.

[0005] (3) Industrial dust removal: Due to their small particle size, micro and nano particles have low dust removal efficiency. Heterogeneous condensation technology is used to condense steam on the surface of micro and nano particles, thereby increasing their particle size and improving the removal efficiency.

[0006] The heterogeneous condensation of particles generates a large number of dust-laden droplets. During their movement, these dust-laden droplets collide with solid walls. Since the interior of the dust-laden droplets is solid while the exterior is liquid, their bouncing behavior after colliding with the solid walls differs from that of pure droplets and pure solid particles. Therefore, it is necessary to study their bouncing behavior after colliding with the walls.

[0007] However, current methods for measuring the bouncing behavior of particles after colliding with solid walls are all based on airflow carrying and manipulation by nanorobotic arms. Specifically, traditional methods for measuring the bouncing behavior of particles impacting walls fall into two categories, as shown below:

[0008] 1. Using airflow to carry particles to impact solid walls, however, due to the certain delay of particles with the flow and the difficulty in controlling the velocity and size of the flow field, this method is difficult to accurately control the velocity and direction of particles. Furthermore, the drag force of the flow field on the particles will affect the liquid distribution on the outside of the dust-laden droplets and affect the bouncing behavior of the particles after hitting the wall.

[0009] 2. Using nanorobotic arms to manipulate particles to collide with solid walls; however, since the dust-laden droplets are surrounded by liquid, the robotic arms can affect the quality and distribution of the liquid.

[0010] The methods described above affect the liquid distribution on the solid surface, which in turn affects the bouncing behavior of dust-laden droplets after colliding with the solid wall. Therefore, existing methods for measuring particle-solid wall collisions are not suitable for studying the bouncing behavior of dust-laden droplets colliding with solid walls.

[0011] In summary, existing technologies are unable to effectively measure the bouncing behavior of dust-laden droplets impacting a wall surface. Summary of the Invention

[0012] The purpose of this invention is to provide a system for observing the bouncing behavior of dust-laden droplets impacting a wall surface, so as to realize the observation of the bouncing behavior of dust-laden droplets impacting a wall surface.

[0013] To achieve the above objectives, the present invention provides the following solution:

[0014] A system for observing the bouncing behavior of dust-laden droplets impacting a wall, the system comprising:

[0015] Particle generator, used to emit a stream of particles;

[0016] An environmental chamber, connected to the particle generator, has a solid wall inside to transform the incoming particulate airflow into dust-laden droplets.

[0017] Displacement control unit, used for:

[0018] At least two laser beams are emitted into the environmental chamber and converged to form an optical trap; the optical trap is used to capture the dust-containing droplets.

[0019] The speed and direction of the captured dust-laden droplets are adjusted to control the captured dust-laden droplets to collide with the solid wall at a set speed and in a set direction;

[0020] The observation unit, connected to the displacement control unit, is used to observe the trajectory of dust-laden droplets that collide with the solid wall at a set speed and in a set direction in real time.

[0021] Optionally, a particulate airflow inlet is provided on the first side wall of the environmental chamber, a first laser inlet is provided on the second side wall of the environmental chamber, and a second laser inlet is provided on the third side wall of the environmental chamber;

[0022] The first sidewall is perpendicular to the second sidewall; the second sidewall is positioned opposite to the third sidewall.

[0023] Optionally, the displacement control unit includes: a first laser generating module, a first control module, a second laser generating module, and a second control module;

[0024] The first laser generating module is used to emit a first laser; the second laser generating module is used to emit a second laser.

[0025] The first control module is used to control the speed and direction of movement of the first laser entering the environmental chamber;

[0026] The second control module is used to control the speed and direction of movement of the second laser entering the environmental chamber; the first laser and the second laser converge in the environmental chamber to form a light trap.

[0027] Optionally, the first laser generating module includes: a first laser and a first laser controller;

[0028] The first laser controller is connected to the first laser; the first laser is connected to the first control module.

[0029] The first laser controller is used to control the first laser to emit the first laser.

[0030] Optionally, the second laser generating module includes: a second laser and a second laser controller;

[0031] The second laser controller is connected to the second laser; the second laser is connected to the second control module.

[0032] The second laser controller is used to control the second laser to emit the second laser.

[0033] Optionally, the first control module includes: a first reflector, a first convex lens, and a first displacement controller;

[0034] The first displacement controller is connected to the first reflector and the first convex lens respectively; the first reflector is disposed in the output light path of the first laser; the first convex lens is disposed in the reflected light path of the first reflector.

[0035] The first reflector is used to reflect the first laser beam to the first convex lens; the first convex lens is used to direct the first laser beam reflected by the first reflector into the environmental chamber.

[0036] The first displacement controller is used to adjust the movement speed and direction of the first reflector and the first convex lens, so as to change the movement speed and direction of the first laser entering the environmental chamber.

[0037] Optionally, the second control module includes: a second reflector, a second convex lens, and a second displacement controller;

[0038] The second displacement controller is connected to the second reflector and the second convex lens respectively; the second reflector is arranged in the output light path of the second laser; the second convex lens is arranged in the reflected light path of the second reflector.

[0039] The second reflector is used to reflect the second laser beam to the second convex lens; the second convex lens is used to direct the second laser beam reflected by the second reflector into the environmental chamber.

[0040] The second displacement controller is used to adjust the movement speed and direction of the second reflector and the second convex lens, so as to change the movement speed and direction of the second laser entering the environmental chamber.

[0041] Optionally, the observation system includes: a temperature-controlled water bath and a humidity controller;

[0042] Both the temperature-controlled water bath and the humidity controller are connected to the environmental chamber.

[0043] The temperature-controlled water bath is used to control and regulate the temperature inside the environmental chamber, so that the environmental chamber is maintained at a set temperature; the humidity controller is used to control and regulate the humidity inside the environmental chamber, so that the environmental chamber is maintained at a set humidity; the particulate airflow entering the environmental chamber is transformed into dust-laden droplets under the set temperature and the set humidity.

[0044] Optionally, the observation unit is a microscope.

[0045] Optionally, the observation system further includes: a particulate-resistant pipe;

[0046] The particle generator is connected to the environmental chamber via the anti-particle adhesion pipe.

[0047] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0048] This invention provides a system for observing the bouncing behavior of dust-laden droplets impacting a wall. A particle generator emits a particulate airflow, which is then converted into dust-laden droplets in an environmental chamber containing a solid wall. A displacement control unit emits at least two laser beams, which converge to form an optical trap to capture the dust-laden droplets. The system adjusts the speed and direction of the captured droplets to control their collision with the solid wall at a predetermined speed and direction. Finally, an observation unit monitors the bouncing behavior of the droplets in real time after impacting the wall. Because the droplets are captured via the optical trap, and their speed and direction are changed to achieve directional, non-contact control, the system simplifies droplet control, allows for precise control, and eliminates factors that could affect the collision. Therefore, this invention enables the observation of the bouncing behavior of dust-laden droplets impacting a wall. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 A schematic diagram of a dust-laden droplet impact and bouncing behavior observation system provided in an embodiment of the present invention;

[0051] Figure 2 This is a structural diagram of the dust-laden droplet impact and bouncing behavior observation system provided in an embodiment of the present invention.

[0052] Symbol explanation:

[0053] Particle generator-1, environmental chamber-2, displacement control unit-3, observation unit-4, first laser generating module-5, first control module-6, second laser generating module-7, second control module-8, first laser-9, first laser controller-10, second laser-11, second laser controller-12, first reflector-13, first convex lens-14, first displacement controller-15, second reflector-16, second convex lens-17, second displacement controller-18, temperature-controlled water bath-19, humidity controller-20, anti-particle adhesion pipe-21, solid wall surface-22, dust-laden droplets-23. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] The purpose of this invention is to provide a system for observing the bouncing behavior of dust-laden droplets impacting a wall. The system employs a particle generator to emit a particulate airflow, which is then transformed into dust-laden droplets within an environmental chamber containing a solid wall. A displacement control unit emits at least two laser beams, which converge to form an optical trap to capture the dust-laden droplets. The system adjusts the speed and direction of the captured droplets to control their collision with the solid wall at a predetermined speed and direction. Finally, an observation unit monitors the trajectory of the droplets in real time. Because the system captures the droplets using an optical trap and achieves directional, non-contact control by altering their speed and direction, the system simplifies droplet control, allows for precise control, and eliminates factors that could affect the collision. Therefore, this invention enables the observation of the bouncing behavior of dust-laden droplets impacting a wall.

[0056] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] like Figure 1 and Figure 2 As shown, this embodiment of the invention provides a system for observing the bouncing behavior of dust-laden droplets impacting a wall. The system includes a particle generator 1, an environmental chamber 2, a displacement control unit 3, and an observation unit 4.

[0058] The environmental chamber 2 is connected to the particle generator 1, and a solid wall 22 is provided inside the environmental chamber 2. The observation unit 4 is connected to the displacement control unit 3.

[0059] Particle generator 1 is used to emit a particle gas flow; environmental chamber 2 is used to transform the incoming particle gas flow into dust-laden droplets 23. Environmental chamber 2 is a transparent environmental chamber used to provide a particle growth environment with specific temperature and humidity. The two sides of environmental chamber 2 are transparent walls to allow the laser based on the optical tweezers system to enter.

[0060] The displacement control unit 3 is used to emit at least two laser beams into the environmental chamber 2 and to converge the laser beams to form an optical trap; the optical trap is used to capture dust-laden droplets 23.

[0061] The particle generator 1 uses an aerosol generator to generate an airflow of micro-nano particles carrying specific components and specific particle sizes, which then enters the environmental chamber 2.

[0062] The laser emitted into environmental chamber 2 is a laser beam with adjustable wavelength and power.

[0063] The laser wavelength is selected based on the composition of the particulate gas flow and the composition of the condensing medium. The wavelength is chosen to avoid the absorption bands of the particles and the condensing medium, so as to avoid the phenomenon that the laser is absorbed by the particles and generates heat, which would lead to the evaporation of liquid on the particle surface.

[0064] During the condensation and growth process, as the mass of the particles continuously increases, the power of the laser needs to be automatically adjusted under the action of the displacement control unit 3 to ensure that the dust-laden droplets 23 are continuously and stably suspended at the center of the environmental chamber 2.

[0065] The displacement control unit 3 adjusts the speed and direction of the captured dust-laden droplets 23 to control the captured dust-laden droplets 23 to collide with the solid wall surface 22 at a set speed and in a set direction.

[0066] The observation unit 4 is used to observe the trajectory of a dust-laden droplet 23 that collides with the solid wall 22 at a set speed and in a set direction in real time. Specifically, it observes the bouncing behavior (adhesion, wall-sliding, elastic collision) of the dust-laden droplet 23 after colliding with the solid wall 22 in real time. The observation unit 4 is a microscope. This microscope can be a high-speed microscope to capture the transient positional changes of the dust-laden droplet 23 after colliding with the solid wall 22 in real time.

[0067] Specifically, the displacement control unit 3 includes: a first laser generating module 5, a first control module 6, a second laser generating module 7, and a second control module 8.

[0068] The first laser generating module 5 is used to emit a first laser; the second laser generating module 7 is used to emit a second laser; the first control module 6 is used to control the speed and direction of the first laser entering the environmental chamber 2; the second control module 8 is used to control the speed and direction of the second laser entering the environmental chamber 2; the first and second lasers converge in the environmental chamber 2 to form an optical trap. When a dust-laden droplet 23 passes through the optical trap in the environmental chamber 2, the droplet 23 is subjected to light pressure and captured by the optical trap; since the optical trap is formed by the convergence of the first and second lasers, by adjusting the speed and direction of the first and second lasers, the direction and speed of the optical trap can be changed, thereby changing the direction and speed of the captured dust-laden droplet 23, so that the captured dust-laden droplet 23 eventually collides with the solid wall 22 at a set speed and a set direction.

[0069] By changing the direction and speed of the optical trap, dust-laden droplets 23 at different positions can be captured, and the number of dust-laden droplets 23 captured is also different. Then, by observing the trajectory of the dust-laden droplets 23 through the observation unit 4, the bouncing motion law of the dust-laden droplets 23 after colliding with the solid wall 22 can be obtained.

[0070] Furthermore, the first laser generating module 5 includes a first laser 9 and a first laser controller 10. The first laser controller 10 is connected to the first laser 9; the first laser 9 is connected to the first control module 6; the first laser controller 10 is used to control the first laser 9 to emit the first laser. The first laser controller 10 can also adjust the wavelength and power of the first laser emitted by the first laser 9.

[0071] The second laser generating module 7 includes: a second laser 11 and a second laser controller 12; the second laser controller 12 is connected to the second laser 11; the second laser 11 is connected to the second control module 8; the second laser controller 12 is used to control the second laser 11 to emit a second laser. The second laser controller 12 can also adjust the wavelength and power of the second laser emitted by the second laser 11.

[0072] By adjusting the wavelengths of the first and second lasers, the absorption bands of particles and condensing working fluids are avoided, thus preventing the phenomenon that the laser is absorbed by the particles and generates heat, resulting in a wall thermal effect that affects the evaporation rate of the liquid on the particle surface. In addition, during the heterogeneous condensation process, the power of the first and second lasers is adjusted according to the change in the mass of the dust-laden droplets, so as to achieve continuous and stable control of the dust-laden droplets.

[0073] The first control module 6 includes: a first reflector 13, a first convex lens 14, and a first displacement controller 15; the first displacement controller 15 is connected to the first reflector 13 and the first convex lens 14 respectively; the first reflector 13 is disposed in the output light path of the first laser; the first convex lens 14 is disposed in the reflected light path of the first reflector 13; the first reflector 13 is used to reflect the first laser to the first convex lens 14; the first convex lens 14 is used to direct the first laser reflected by the first reflector 13 into the environmental chamber 2.

[0074] The first displacement controller 15 is used to adjust the movement speed and direction of the first reflector 13 and the first convex lens 14, so as to change the movement speed and direction of the first laser entering the environmental chamber 2.

[0075] The second control module 8 includes: a second reflector 16, a second convex lens 17, and a second displacement controller 18; the second displacement controller 18 is connected to the second reflector 16 and the second convex lens 17 respectively; the second reflector 16 is disposed in the output light path of the second laser; the second convex lens 17 is disposed in the reflected light path of the second reflector 16; the second reflector 16 is used to reflect the second laser to the second convex lens 17; the second convex lens 17 is used to direct the second laser reflected by the second reflector 16 into the environmental chamber 2.

[0076] The second displacement controller 18 is used to adjust the movement speed and direction of the second reflector 16 and the second convex lens 17, so as to change the movement speed and direction of the second laser entering the environmental chamber 2.

[0077] A particulate airflow inlet is provided on the first side wall of the environmental chamber 2, a first laser inlet is provided on the second side wall of the environmental chamber 2, and a second laser inlet is provided on the third side wall of the environmental chamber 2; the first side wall is perpendicular to the second side wall; the second side wall is positioned opposite to the third side wall.

[0078] In short, the first laser entering the environmental chamber 2, after passing through the first reflector 13 and the first convex lens 14, converges with the second laser passing through the second reflector 16 and the second convex lens 17 at the center of the environmental chamber 2, and generates a light trap of a certain intensity at that location.

[0079] As an optional implementation, the observation system includes: a temperature-controlled water bath 19 and a humidity controller 20; both the temperature-controlled water bath 19 and the humidity controller 20 are connected to the environmental chamber 2; the temperature-controlled water bath 19 is used to control and regulate the temperature inside the environmental chamber 2, so that the environmental chamber 2 is maintained at a set temperature; the humidity controller 20 is used to control and regulate the humidity inside the environmental chamber 2, so that the environmental chamber 2 is maintained at a set humidity; the particulate airflow entering the environmental chamber 2 is transformed into dust-laden droplets 23 under the set temperature and set humidity.

[0080] In short, under the action of the temperature-controlled water bath 19 and the humidity controller 20, a supersaturated environment with a certain temperature and a certain humidity is generated in the environmental chamber 2.

[0081] The observation system also includes: an anti-particle adhesion pipe 21; the particle generator 1 is connected to the environmental chamber 2 through the anti-particle adhesion pipe 21.

[0082] The particulate airflow emitted by the particulate generator 1 enters the environmental chamber 2 through the anti-particulate adhesion pipe 21. The particulate airflow refers to the airflow formed by micro- and nano-particles. These micro- and nano-particles condense and grow in the supersaturated environment of the environmental chamber 2, forming dust-laden droplets 23.

[0083] Furthermore, by changing parameters such as the original particle size, the size of the dust-laden droplet before colliding with the solid wall, the velocity of the dust-laden droplet, and the direction of the dust-laden droplet, the observation system provided in this embodiment of the invention can obtain the influence of each parameter on the bouncing behavior of the dust-laden droplet after colliding with the solid wall.

[0084] Existing methods based on airflow carrying particles to impact solid walls and using nanorobotic arms to manipulate particles to collide with solid walls are not suitable for measuring the bouncing behavior of dust-laden droplets after colliding with solid walls. This is because the drag force of the airflow on the dust-laden droplets and the gripping of the particles by the robotic arm will affect the liquid distribution on the particle surface, thus affecting the study of the bouncing behavior of dust-laden droplets after colliding with solid walls.

[0085] This invention employs optical tweezers technology to converge two laser beams to create an optical trap. Dust-laden droplets near the optical trap are bound under the action of optical pressure. By moving the laser beam, directional non-contact manipulation of the dust-laden droplets can be achieved. By controlling the direction and speed of the laser beam, the dust-laden droplets can be controlled to impact a solid wall at a certain speed and direction. This overcomes the influence of existing particle manipulation methods on the liquid distribution outside the dust-laden droplets. Then, the bouncing behavior of the dust-laden droplets after impacting the solid wall is observed using a microscope, and the influencing factors and laws of the collision and bouncing behavior of dust-laden droplets on the solid wall are further studied, meeting the needs of research on the bouncing behavior of dust-laden droplets impacting solid walls.

[0086] The observation system provided by this invention can be applied to many fields such as internal combustion engine combustion, spray cooling, pesticide spraying and inkjet printing; it can also be applied to industrial production such as power machinery and thin film material deposition and preparation, so as to carry out excellent industrial production based on bouncing behavior.

[0087] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0088] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the system and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A system for observing the bouncing behavior of dust-laden droplets impacting a wall surface, characterized in that, The observation system includes: Particle generator, used to emit a stream of particles; An environmental chamber, connected to the particle generator, has a solid wall inside to transform the incoming particulate airflow into dust-laden droplets. Displacement control unit, used for: At least two laser beams are emitted into the environmental chamber and converged to form an optical trap; the optical trap is used to capture the dust-containing droplets. The speed and direction of the captured dust-laden droplets are adjusted to control the captured dust-laden droplets to collide with the solid wall at a set speed and in a set direction; The observation unit, connected to the displacement control unit, is used to observe the trajectory of dust-laden droplets that collide with the solid wall at a set speed and in a set direction in real time.

2. The observation system for the bouncing behavior of dust-laden droplets impacting a wall according to claim 1, characterized in that, A particulate airflow inlet is provided on the first side wall of the environmental chamber, a first laser inlet is provided on the second side wall of the environmental chamber, and a second laser inlet is provided on the third side wall of the environmental chamber. The first sidewall is perpendicular to the second sidewall; the second sidewall is positioned opposite to the third sidewall.

3. The observation system for the bouncing behavior of dust-laden droplets impacting a wall according to claim 1, characterized in that, The displacement control unit includes: a first laser generating module, a first control module, a second laser generating module, and a second control module; The first laser generating module is used to emit a first laser; the second laser generating module is used to emit a second laser. The first control module is used to control the speed and direction of movement of the first laser entering the environmental chamber; The second control module is used to control the speed and direction of movement of the second laser entering the environmental chamber; the first laser and the second laser converge in the environmental chamber to form a light trap.

4. The observation system for observing the bouncing behavior of dust-laden droplets impacting a wall surface according to claim 3, characterized in that, The first laser generating module includes: a first laser and a first laser controller; The first laser controller is connected to the first laser; the first laser is connected to the first control module. The first laser controller is used to control the first laser to emit the first laser.

5. The observation system for the bouncing behavior of dust-laden droplets impacting a wall surface according to claim 3, characterized in that, The second laser generating module includes: a second laser and a second laser controller; The second laser controller is connected to the second laser; the second laser is connected to the second control module. The second laser controller is used to control the second laser to emit the second laser.

6. The observation system for observing the bouncing behavior of dust-laden droplets impacting a wall according to claim 3, characterized in that, The first control module includes: a first reflector, a first convex lens, and a first displacement controller; The first displacement controller is connected to the first reflector and the first convex lens respectively; the first reflector is disposed in the output light path of the first laser; the first convex lens is disposed in the reflected light path of the first reflector. The first reflector is used to reflect the first laser beam to the first convex lens; the first convex lens is used to direct the first laser beam reflected by the first reflector into the environmental chamber. The first displacement controller is used to adjust the movement speed and direction of the first reflector and the first convex lens, so as to change the movement speed and direction of the first laser entering the environmental chamber.

7. The observation system for observing the bouncing behavior of dust-laden droplets impacting a wall surface according to claim 3, characterized in that, The second control module includes: a second reflector, a second convex lens, and a second displacement controller; The second displacement controller is connected to the second reflector and the second convex lens respectively; the second reflector is arranged in the output light path of the second laser; the second convex lens is arranged in the reflected light path of the second reflector. The second reflector is used to reflect the second laser beam to the second convex lens; the second convex lens is used to direct the second laser beam reflected by the second reflector into the environmental chamber; The second displacement controller is used to adjust the movement speed and direction of the second reflector and the second convex lens, so as to change the movement speed and direction of the second laser entering the environmental chamber.

8. The observation system for the bouncing behavior of dust-laden droplets impacting a wall according to claim 1, characterized in that, The observation system includes: a temperature-controlled water bath and a humidity controller; Both the temperature-controlled water bath and the humidity controller are connected to the environmental chamber. The temperature-controlled water bath is used to control and regulate the temperature inside the environmental chamber, so that the environmental chamber is maintained at a set temperature; the humidity controller is used to control and regulate the humidity inside the environmental chamber, so that the environmental chamber is maintained at a set humidity; the particulate airflow entering the environmental chamber is transformed into dust-laden droplets under the set temperature and the set humidity.

9. The observation system for the bouncing behavior of dust-laden droplets impacting a wall according to claim 1, characterized in that, The observation unit is a microscope.

10. The observation system for the bouncing behavior of dust-laden droplets impacting a wall according to claim 1, characterized in that, The observation system also includes: a pipe to prevent particle adhesion; The particle generator is connected to the environmental chamber via the anti-particle adhesion pipe.

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