Parallel Capillary Nebulizer for High Solid Sample Analysis
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Solution Overview
Problem
Existing nebulizer designs face challenges with plugging due to small inner diameters, inconsistency, and reduced performance when handling high solid content samples, particularly in concentric and V-groove nebulizers, which limits their analytical precision and sensitivity.
Innovation Solution
A thin film induction nebulizer design with a gas capillary and liquid capillary aligned in the same direction, featuring a nebulizer tip with a roughened surface and a tapered gas capillary end for increased induction, allowing for a larger liquid capillary diameter without plugging, and efficient atomization of high solid content samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a small inner diameter liquid capillary is used in concentric nebulizers to generate fine mist, then analytical sensitivity and precision are improved, but plugging of the capillary occurs frequently
Solution Approach 1:
The patent transitions from a concentric arrangement (liquid capillary inside gas capillary) to a parallel arrangement where both capillaries run side-by-side. This dimensional reconfiguration allows the liquid capillary to have a larger diameter without compromising mist fineness, as the atomization occurs through interaction at the capillary ends rather than through the length of nested capillaries.
Solution Approach 2:
The patent separates the functions of liquid delivery and gas flow into distinct parallel pathways rather than nesting them. The liquid capillary and gas capillary are positioned adjacent to each other with their ends facing one another, allowing independent optimization of each capillary's diameter without the plugging issues inherent in concentric designs.
2Reliability
If a larger liquid capillary diameter is used to prevent plugging, then plugging resistance is improved, but mist fineness and consistency deteriorate
Solution Approach 1:
By arranging capillaries in parallel rather than concentrically, the system allows larger capillary diameters while maintaining fine mist generation. The atomization efficiency depends on the interaction geometry at the capillary ends and the induction field, not on the nested configuration that constrains diameter choices.
Solution Approach 2:
The patent optimizes the local geometry at the capillary ends where atomization occurs. The gas capillary is positioned to create an induction field that effectively atomizes liquid from the parallel liquid capillary, ensuring fine mist generation regardless of the liquid capillary's larger diameter.
3Reliability
If cross flow nebulizers use a larger liquid capillary diameter, then plugging resistance is improved, but mist fineness and consistency are reduced
Solution Approach 1:
Instead of having gas flow across the liquid capillary (cross flow), the patent positions both capillaries parallel with their ends facing each other, allowing induction to draw liquid into the gas stream. This inverted configuration maintains plugging resistance while improving mist quality by optimizing the induction field geometry.
4Reliability
If V-groove nebulizers are used to handle high solid content samples, then plugging resistance is improved, but droplet size consistency and analytical precision are reduced
Solution Approach 1:
The patent abandons the V-groove geometry in favor of parallel capillary arrangement. This dimensional change allows for larger capillary openings that resist plugging by high solid content samples while maintaining droplet consistency through optimized induction field geometry at the parallel capillary ends.
Solution Approach 2:
The patent changes the geometric parameters of the nebulizer design, specifically transitioning from V-groove to parallel capillary configuration. This allows optimization of capillary diameter and induction field strength to achieve both plugging resistance and droplet consistency simultaneously.
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 nebulizer achieves superior analytical precision and sensitivity comparable to concentric nebulizers while being more resistant to plugging and maintaining long-term stability, even with high solid content samples, and handles unfiltered samples effectively.
Implementation Method 1
Pneumatic induction nebulizers generally operate in the following manner, relying on the Venturi effect to draw liquid into a gas stream
Implementation Method 2
The draw of the lower pressure gas creates lower pressure at the orifice. This creates considerable suction at the orifice
Implementation Method 3
Gas at a higher pressure exits from a small orifice into gas at a lower pressure and forms a gas stream in the lower pressure zone. This pushes the lower pressure gas away from the orifice and generates gas flow in the lower pressure gas zone. This in turn draws some of the lower pressure gas into the higher pressure gas stream. The draw of the lower pressure gas creates lower pressure at the orifice.
Data Source
AI summary
A nebulizer having a gas capillary and a liquid capillary that are aligned in the same direction within a nebulizer housing is disclosed. The nebulizer includes a nebulizer tip that is substantially parallel to a cross-section of the liquid capillary and to a cross-section of the gas capillary. The tip includes a liquid opening and a gas orifice. The gas capillary may have a non-tapered body and a tapered end. The tip has a roughened surface that allows wetting of the tip with liquid that exits from the liquid opening to form a thin film. The nebulizer may be formed from glass, quartz, one or more polymers, metals, or alloys, or a combination thereof. The nebulizer is capable of handling high solid content samples, and it also offers precision and sensitivity comparable to concentric nebulizers. Methods of introducing a sample into an instrument using the disclosed nebulizer are also disclosed.