Two-Fluid Nozzle Atomization via Gas-Liquid Impingement
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Solution Overview
Problem
Conventional two-fluid nozzles fail to adequately atomize liquids, resulting in large particle sizes that vaporize slowly, causing objects sprayed to become dripping wet due to delayed vaporization.
Innovation Solution
A two-fluid nozzle spraying apparatus with a disc-shaped gas-liquid mixing section, featuring an annular member and flow guide plate, which atomizes the liquid into small particles (10 μm or less) by impinging gas and liquid within the mixing section, allowing quick vaporization and preventing dripping wetness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional two-fluid nozzle with triple-barrel structure is used, then the nozzle can spray liquid, but the liquid atomization is insufficient resulting in large particle sizes
Solution Approach 1:
The nozzle is divided into three distinct barrels (inner, middle, outer) with separate functions: the inner barrel supplies liquid through a restricted orifice, the middle barrel supplies primary gas, and the outer barrel supplies secondary gas. This segmentation allows each component to be optimized independently for achieving fine atomization with 10 μm or less particle size while maintaining manageable structural complexity through modular design.
2Duration of action of moving object
If the liquid particle size is large, then the spray coverage is sufficient, but the vaporization is slow causing objects to become dripping wet
Solution Approach 1:
The invention utilizes pneumatic principles by introducing compressed gas through the middle and outer barrels to atomize the liquid discharged from the inner barrel. The gas flow creates turbulence and shear forces that break the liquid into fine droplets with 10 μm or less particle size, enabling rapid vaporization and preventing dripping wetness on sprayed objects.
3Device complexity
If the nozzle structure is simplified, then the device complexity is reduced, but the atomization performance deteriorates
Solution Approach 1:
The nozzle employs a nested barrel structure where the inner barrel is positioned within the middle barrel, which is in turn positioned within the outer barrel. This nested configuration allows three separate fluid streams (liquid and two gas flows) to interact in a compact space, achieving fine atomization performance without requiring a complex external arrangement of 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
The apparatus effectively atomizes liquids into small particles that vaporize rapidly, preventing dripping wetness on objects sprayed, with a Sauter mean diameter of 10.0 μm and noise value of 80 dB, enhancing atomization performance.
Implementation Method 1
atomizes the liquid into small particles (10 μm or less) by impinging gas and liquid within the mixing section
Implementation Method 2
atomizes a liquid, using a gas such as an air, nitrogen, steam, etc.
Implementation Method 3
sprays liquid which has a small particle size and vaporize so quickly that an object sprayed with the liquid does not get dripping wet
Data Source
AI summary
A spraying apparatus includes: an inner lid; a flow guide plate; and an annular member, wherein a liquid is introduced into a gas -liquid mixing section between the inner lid, the flow guide plate, and the annular member from an inner lid plate of the inner lid, the inner lid plate being a flat plate located upstream of the spraying apparatus and proximate the gas-liquid mixing section, and a gas is introduced into the gas-liquid mixing section from an opposite position, the liquid is atomized in the gas-liquid mixing section by the liquid impinging with the gas and transforming into a gas-liquid mixed fluid, and advancing to a spouting portion as the gas-liquid mixed fluid is circulated in the gas-liquid mixing section along the internal surface of the annular member on the flow guide plate and facing the gas-liquid mixing section.