HNB Aerosol Flow Split Design for Uniform Heating and Energy Savings
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Solution Overview
Problem
Existing heat-not-burn (HNB) aerosol-generating devices face inefficiencies in energy consumption and temperature uniformity of the aerosol-forming substrate, leading to suboptimal aerosol production and waste of energy.
Innovation Solution
The devices incorporate a flow distributor mechanism that splits incoming airflow into a target airflow passing through the aerosol-forming substrate and a secondary airflow bypassing it, allowing for more uniform temperature distribution and increased energy efficiency by mixing the heated outflow with cooler bypass air to enhance aerosol formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If all incoming airflow passes through the aerosol-forming substrate, then aerosol production is maximized, but temperature uniformity deteriorates and energy is wasted
Solution Approach 1:
The incoming airflow is segmented into two separate streams: a target airflow that passes through the aerosol-forming substrate to generate aerosol, and a secondary airflow that bypasses the substrate. This segmentation allows independent control of each flow path, enabling the target airflow to be heated to optimal temperatures for aerosol generation while the secondary airflow remains cooler, thereby improving temperature uniformity across the substrate without compromising aerosol production volume.
Solution Approach 2:
The patent changes the flow distribution parameters by introducing a flow distributor that controls the ratio of target airflow to secondary airflow. By adjusting these flow parameters, the system optimizes the balance between aerosol generation quantity and temperature distribution uniformity, preventing both overheating and insufficient heating zones on the substrate surface.
2Quantity of substance
If high temperature is applied to the aerosol-forming substrate, then aerosol mass increases, but energy consumption increases
Solution Approach 1:
The patent extracts the secondary airflow from the main incoming airflow stream, separating it from the target airflow that contacts the heated substrate. This extracted secondary airflow, which does not require heating, is then recombined with the heated target airflow downstream. This extraction eliminates the energy waste that would occur if all incoming air needed to be heated to high temperatures, thereby reducing overall energy consumption while maintaining aerosol production levels.
Solution Approach 2:
The patent introduces a mixing chamber as an intermediary component between the heated target airflow and the cooler secondary airflow. This intermediary allows the two airflow streams to combine and mix, creating a final aerosol stream that maintains sufficient temperature for aerosol stability while being cooler than if all air had been heated to maximum temperatures, thus reducing energy consumption.
3Quantity of substance
If high temperature is applied to the aerosol-forming substrate, then aerosol mass increases, but particle size increases
Solution Approach 1:
The patent implements a two-stage thermal process: first, the target airflow is rapidly heated to high temperature as it passes through the aerosol-forming substrate to maximize aerosol generation; second, the mixed flow undergoes rapid cooling when combined with the cooler secondary airflow. This periodic heating and cooling action produces high aerosol mass while the rapid cooling phase prevents excessive particle growth, maintaining smaller particle sizes.
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 achieves higher temperatures and more uniform temperature distribution in the aerosol-forming substrate, resulting in increased aerosol mass, improved energy efficiency, and smaller particle sizes while reducing energy waste.
Implementation Method 1
heat a plant material to a temperature that is sufficient to release constituents of the plant material while keeping the temperature below its ignition temperature
Implementation Method 2
a flow distributor that splits incoming airflow into a target airflow passing through the aerosol-forming substrate and a secondary airflow bypassing it
Implementation Method 3
mixing the heated outflow with cooler bypass air to enhance aerosol formation
Implementation Method 4
combining the heated outflow with a secondary airflow to produce a mixed flow
Implementation Method 5
generating an aerosol of constituents released by heating
Data Source
AI summary
An aerosol-generating device may include an aerosol-forming substrate and a device body configured to receive the aerosol-forming substrate and an incoming airflow. The device body is additionally configured to direct a target airflow of the incoming airflow through the aerosol-forming substrate while the aerosol-forming substrate is heated such that a heated outflow exits therefrom. The device body is further configured to combine the heated outflow with a secondary airflow to produce a mixed flow. The secondary airflow is an air stream that has not passed through the aerosol-forming substrate. The aerosol-forming substrate may be contained in a capsule that is configured to split the incoming airflow into the target airflow and the secondary airflow.