Ejector Venturi Mixing for Aerosol Homogeneity
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Solution Overview
Problem
Existing aerosol-generating devices suffer from incomplete mixing of air and volatile compounds, affecting user experience, and residue from depleted aerosol-forming substrates contaminating fingers during article removal.
Innovation Solution
The device incorporates an ejector with an enclosed channel and a venturi to enhance airflow management, promoting mixing of air and volatile compounds, and features like upstream and downstream homogenization chambers for improved mixing and cooling, along with a slidable interface for easy article removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If air is drawn through the device and mixes with volatile compounds from the heated substrate, then aerosol is generated for inhalation, but incomplete mixing of air and volatile compounds adversely affects user experience
Solution Approach 1:
The ejector acts as an intermediary component between the heating assembly and the aerosol outlet. It defines an enclosed air flow path that forces air and volatile compounds to mix within its channels before exiting. The venturi feature within the ejector creates a constriction that enhances mixing by increasing turbulence and contact between air and vaporized compounds, ensuring homogeneous aerosol formation.
Solution Approach 2:
The ejector utilizes pneumatic principles by creating a venturi effect - a constriction in the air flow path that accelerates airflow and creates a pressure differential. This pneumatic mechanism enhances the mixing of air and volatile compounds through increased velocity and turbulence within the enclosed channel, improving aerosol homogeneity without additional mechanical components.
2Temperature
If the heating assembly heats the aerosol-forming substrate to generate aerosol, then volatile compounds are evolved, but the aerosol may be excessively hot affecting user safety
Solution Approach 1:
The ejector serves as a thermal intermediary between the hot heating assembly and the user's mouth. The enclosed air flow path within the ejector allows the hot aerosol to travel through a longer pathway, providing passive cooling. The venturi-induced turbulence also promotes mixing with cooler ambient air, reducing aerosol temperature before delivery to the user.
Solution Approach 2:
The air flow path within the ejector provides continuous cooling of the aerosol as it travels from the heating assembly to the outlet. The sustained airflow through the enclosed channel ensures that cooling occurs throughout the entire transport path, not just at discrete points, maintaining safe temperatures consistently.
3Stability of the object's composition
If the ejector defines an enclosed air flow path to promote mixing, then aerosol homogeneity is improved, but device complexity increases
Solution Approach 1:
The ejector is designed as a multi-functional component that simultaneously: (1) defines the enclosed air flow path, (2) provides the venturi constriction for enhanced mixing, (3) offers thermal cooling of the aerosol, and (4) serves as part of the structural housing. This consolidation of multiple functions into a single component achieves improved aerosol homogeneity without proportionally increasing device complexity.
Solution Approach 2:
The ejector utilizes geometric parameter changes - specifically the venturi constriction ratio and channel dimensions - to achieve enhanced mixing. By optimizing these geometric parameters, the design achieves effective aerosol homogenization through passive fluid dynamics rather than active mechanical mixing mechanisms, reducing overall device complexity.
4Ease of operation
If a slidable interface is provided for ejector operation, then article removal is facilitated, but ease of operation is improved at the cost of additional structural elements
Solution Approach 1:
The slidable interface is designed to be operated directly by the user's finger, which naturally slides along the exterior surface. The interface leverages the user's own finger as the actuating mechanism, eliminating the need for separate buttons, switches, or complex release mechanisms. This self-service approach improves ease of operation while minimizing additional structural elements.
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
Enhances user experience by ensuring thorough mixing of air and volatile compounds, reduces the likelihood of inhaling excessively hot aerosols, and facilitates clean article removal, minimizing contamination.
Implementation Method 1
The ejector may comprise a venturi, the venturi positioned to form part of the air flow path. A venturi defines a constriction in the air flow path through which the entrained air flow is funnelled, with the change in cross sectional area of the flowpath in the venturi imparting a change in velocity of the entrained air flow as it flows therethrough.
Implementation Method 2
The heating assembly is configured to heat the aerosol-forming substrate of the aerosol-generating article received in the cavity to generate an aerosol.
Data Source
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AI summary
Aerosol-generating device (1) for use with an aerosol-generating article (7). The aerosol-generating device (1) comprises a housing (2), a heating assembly (3) and an ejector (4). The housing comprises a cavity (24) and an aerosol outlet (231). The cavity is configured to receive the aerosol-generating article. The aerosol-generating device further comprises an air flow path (41) extending within the device downstream from the cavity to the aerosol outlet for conveying an air flow entrained with aerosol. The ejector is coupled to the housing and configured to urge the aerosol-generating article received in the cavity out from the cavity. The ejector defines at least part of the air flow path (41) and is configured to modify the entrained air flow along the air flow path.