Nanoparticle Reactor Lens Housing Flow Control
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Solution Overview
Problem
Conventional reactors for nanoparticle production using laser pyrolysis fail to prevent nanoparticles from flowing to the lens, leading to contamination and potential damage, which hinders continuous operation.
Innovation Solution
The reactor design includes a lens housing with a varying cross-sectional area, where the central axis changes orientation and shape to increase the momentum of flushing gas, preventing nanoparticle backflow and ensuring the flushing gas stream does not intersect with the raw material gas stream, thereby preventing contamination of the lens and inner chamber walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lens is installed apart from the main chamber through a flushing gas injection nozzle, then the lens is protected from nanoparticle contamination, but the lens housing structure becomes complex and nanoparticles still flow to the lens side
Solution Approach 1:
The lens housing transitions from a static structure to a dynamic flow control structure by implementing a varying cross-sectional area that actively guides gas flow. The housing includes a first region with constant cross-sectional area, a second region with reduced cross-sectional area, and a third region that is inclined downward, creating a dynamic flow path that increases flushing gas momentum and prevents nanoparticle backflow to the lens.
Solution Approach 2:
The cross-sectional area parameter of the lens housing is changed along the flow direction to control gas flow characteristics. By reducing the cross-sectional area in the second region and inclining the third region downward, the housing creates a flow path that increases flushing gas velocity and momentum, effectively preventing nanoparticle contamination without requiring complex additional components.
2Device complexity
If the flushing gas stream directly contacts the raw material gas stream, then the lens housing structure is simplified, but the raw material gas stream is disturbed and nanoparticles contaminate the inner wall surfaces
Solution Approach 1:
The lens housing introduces a spatial dimension to the flow path by implementing a three-dimensional configuration with inclined regions. The third region is inclined downward to the first nozzle side, creating a flow path that moves flushing gas in a different spatial direction, preventing direct contact with the raw material gas stream while avoiding nanoparticle deposition on inner walls.
Solution Approach 2:
The lens housing is segmented into three distinct regions with different geometric characteristics: a first region with constant cross-sectional area, a second region with reduced cross-sectional area, and a third region inclined downward. This segmentation allows each region to perform a specific function in controlling the flushing gas flow, preventing direct contact with raw material gas while maintaining structural simplicity.
3Device complexity
If the lens housing has constant cross-sectional area, then the structure is simple, but the flushing gas momentum is insufficient to prevent nanoparticle backflow
Solution Approach 1:
The cross-sectional area parameter of the lens housing is varied along the flow direction to control gas flow characteristics. The housing transitions from a constant cross-sectional area to a variable cross-sectional area design, with the second region having a reduced area and the third region inclined downward. This parameter change increases the flushing gas velocity and momentum, effectively preventing nanoparticle backflow to the lens.
Solution Approach 2:
The lens housing creates a dynamic flow environment by implementing a non-uniform cross-sectional area profile. The varying geometry actively accelerates the flushing gas through the second and third regions, creating sufficient momentum to counteract nanoparticle backflow, while maintaining a relatively simple overall structure without complex mechanical components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively prevents nanoparticle contamination of the lens and inner chamber walls, ensuring continuous operation by enhancing the momentum of the flushing gas and avoiding disturbance to the raw material gas stream, thus maintaining reactor integrity.
Implementation Method 1
the lens housing is formed to have a reduced cross-sectional area toward the main chamber direction, thereby increasing momentum of the flushing gas in the lens housing
Implementation Method 2
a laser pyrolysis method is a method of forming nanoparticles by irradiating a raw material with a laser to decompose the raw material
Implementation Method 3
a light source for irradiation of a laser for passing through the lens to reach the raw material gas in the main chamber
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The present invention relates to a reactor for nanoparticle production, and according to one aspect of the present invention, there is provided a reactor for nanoparticle production, comprising a main chamber including a first nozzle to which raw material gas is supplied, a lens housing connected to the main chamber in a fluidly movable manner and including a second nozzle for supplying flushing gas therein, a lens mounted on the lens housing, a light source for irradiation of a laser for passing through the lens to reach the raw material gas in the main chamber, and a hood for discharging nanoparticles generated in the main chamber, wherein the lens housing is provided so that a cross-sectional area of at least a part of a region decreases along the direction facing the main chamber.