Grooved Air Channelling Element for Aerosol Cooling
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Solution Overview
Problem
Aerosol-generating articles that heat tobacco substrates instead of combusting them face challenges in nicotine release and delivery, requiring improved designs for efficient aerosol generation and user convenience, including rapid aerosol delivery and ease of use.
Innovation Solution
The aerosol-generating article incorporates an air channelling element with external grooves upstream and downstream of the aerosol-generating substrate, enhancing air flow and heat exchange, which promotes quick aerosol nucleation and delivery, while a downstream section with a hollow tubular element and ventilation zone facilitates efficient cooling and aerosol formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the heating temperature is increased to boost nicotine delivery, then nicotine release is improved, but the aerosol needs to be cooled to a greater extent and more rapidly
Solution Approach 1:
The air channelling element is divided into multiple grooves that segment the air flow path, creating multiple parallel cooling channels. This segmentation increases the effective cooling surface area and allows for more efficient heat dissipation from the aerosol without requiring excessive cooling time or temperature reduction.
Solution Approach 2:
The air channelling element with its grooved structure acts as an intermediary component between the heated aerosol-generating substrate and the incoming air stream. It facilitates controlled air flow through the grooves, enabling efficient heat exchange and cooling of the aerosol while maintaining nicotine delivery levels.
2Temperature
If a high filtration efficiency segment is used to cool the mainstream smoke, then cooling is improved, but nicotine delivery is reduced
Solution Approach 1:
The grooves in the air channelling element are strategically positioned and dimensioned to create localized cooling zones specifically where the aerosol contacts the groove surfaces. This localized cooling approach allows for effective temperature reduction without requiring high filtration efficiency segments that would unnecessarily block nicotine delivery pathways.
Solution Approach 2:
The system utilizes pneumatic principles by directing air flow through the grooved air channelling element to achieve cooling. The grooves create turbulent flow patterns that enhance heat transfer coefficients, allowing efficient aerosol cooling through controlled air movement rather than relying on high filtration segments that impede nicotine delivery.
3Speed
If air flow is increased to improve aerosol generation speed, then aerosol delivery speed is improved, but heat exchange efficiency may be reduced
Solution Approach 1:
The grooves in the air channelling element are designed with curved surfaces that promote turbulent flow patterns. This curvature enhances the contact between the air stream and the groove surfaces, improving heat exchange efficiency while maintaining high aerosol delivery speeds through the optimized flow paths.
Solution Approach 2:
The grooved structure adds a dimensional complexity to the air flow path, transforming simple linear flow into multi-dimensional turbulent flow within the grooves. This dimensional enhancement increases the effective heat transfer surface area and improves heat exchange efficiency without compromising aerosol delivery speed.
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 configuration ensures rapid and consistent aerosol delivery with improved nicotine release and user convenience, achieving efficient aerosol generation and cooling, even at lower temperatures, thus addressing the challenges of nicotine delivery and article usability.
Implementation Method 1
The or each air channelling element may comprise a groove defined on an external surface. The groove may define an external air passageway extending from an upstream end of the air channelling element to a downstream end of the air channelling element.
Implementation Method 2
an aerosol is generated by the transfer of heat from a heat source to a physically separate aerosol-generating substrate or material
Implementation Method 3
volatile compounds are released from the aerosol-generating substrate by heat transfer from the heat source
Implementation Method 4
As the released compounds cool, they condense to form an aerosol.
Data Source
AI summary
There is provided an aerosol-generating article for producing an inhalable aerosol upon heating. The aerosol-generating article comprises a rod of aerosol-generating substrate. The aerosol-generating article comprises an air channelling element abutting the rod of aerosol-generating substrate. The air channelling element comprises a groove defined on an external surface. The groove defines an external air passageway extending from an upstream end of the air channelling element to a downstream end of the air channelling element. There is also provided an aerosol-generating system comprising the aerosol-generating article and an aerosol-generating device comprising an external heater, configured to receive and externally heat the aerosol-generating article.