Heater Assembly with Spiral Element for Aerosol Composition Control
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Solution Overview
Problem
Existing aerosol-generating systems face challenges in controlling the vaporization of compounds with different boiling points, leading to undesirable changes in aerosol composition over time, as compounds with lower boiling points are vaporized before those with higher boiling points.
Innovation Solution
The heater assembly features a retention material with a spiral-shaped heating element that creates areas of varying temperatures within the retention material, allowing for simultaneous and controlled vaporization of compounds with different boiling points by optimizing the temperature gradient along the heating element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a liquid aerosol-forming substrate with compounds of different boiling points is heated uniformly, then heating is simple and efficient, but compounds with lower boiling points are vaporized before those with higher boiling points, leading to undesirable changes in aerosol composition over time
Solution Approach 1:
The heating element is designed with non-uniform heating zones where different regions provide different temperature levels. A first region provides a first temperature suitable for vaporizing compounds with lower boiling points, while a second region provides a second temperature for compounds with higher boiling points. This local differentiation of heating conditions ensures that multiple compounds are vaporized simultaneously in appropriate proportions, maintaining consistent aerosol composition throughout use.
2Quantity of substance
If heating temperature is increased to vaporize higher boiling point compounds, then more compounds can be vaporized, but compounds with lower boiling points are vaporized too quickly, causing composition changes
Solution Approach 1:
The heating element creates distinct thermal zones with different temperature levels. The first region maintains a moderate temperature that prevents excessive vaporization of low boiling point compounds, while the second region provides higher temperature to ensure complete vaporization of high boiling point compounds. This spatial differentiation of temperature allows simultaneous optimization of both vaporization completeness and composition stability.
3Stability of the object's composition
If heating temperature is decreased to preserve composition, then aerosol composition remains stable, but vaporization rate is insufficient and not all compounds are vaporized
Solution Approach 1:
The heating element provides differentiated temperature zones where the first region operates at a lower temperature to maintain composition stability by controlling the vaporization rate of sensitive compounds, while the second region operates at a higher temperature to ensure adequate vaporization of recalcitrant compounds. This local optimization resolves the trade-off between vaporization rate and composition stability.
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 solution ensures that compounds are vaporized in more desirable proportions, resulting in a more consistent and stable aerosol composition, improving user experience and maintaining aerosol properties throughout use.
Implementation Method 1
a liquid aerosol-forming substrate is heated and vaporised to form a vapour. The vapour cools and condenses to form an aerosol
Implementation Method 2
The vapour cools and condenses to form an aerosol
Implementation Method 3
The at least one heating element may be shaped to define an interior volume... The interior volume may have a cross-sectional area that decreases along a longitudinal axis... allowing for simultaneous and controlled vaporization of compounds with different boiling points by optimizing the temperature gradient along the heating element
Data Source
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AI summary
A heater assembly (300) for use in an aerosol-generating system (100) is provided. The heater assembly (300) comprises a retention material (302) containing an aerosol-forming substrate in condensed form. The aerosol-forming substrate comprises a first compound and a second compound, the second compound having a higher boiling point than the first compound. At least one airflow path (306) is defined through the retention material (302). The heater assembly (300) comprises at least one heating element (304) shaped to define an interior volume, the interior volume being filled with the retention material. The interior volume has a cross-sectional area that decreases along a longitudinal axis; and the at least one airflow path (306) passes through a first central region (312) of the interior volume and a second central region (310) of the interior volume, the first and second central regions (312, 310) being spaced-apart along the longitudinal axis.