Atomizer Airflow Path Design for Droplet Control
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Solution Overview
Problem
In vapor provision systems like e-cigarettes, the use of planar porous heating elements can lead to aerosol droplets growing to undesirable sizes due to the prolonged air flow over the heating element, resulting in reduced aerosol quality and potential droplet retention within the device.
Innovation Solution
The implementation of an atomizer design with a modified airflow path that includes a vaporization chamber and plenum chambers, where air flows transversely through the heating element for vapor collection and then longitudinally through transport portions, reducing the dwell time and preventing excessive droplet growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a planar porous heating element is used to generate vapor, then vapor production efficiency is improved, but aerosol droplet size increases to undesirable levels
Solution Approach 1:
The vaporization chamber is divided into multiple plenum chambers that are separated from each other by partition walls. Each plenum chamber has its own vapor collection portion, creating multiple independent airflow paths. This segmentation allows the system to maintain high vapor production while limiting the dwell time in each individual path, preventing excessive droplet growth.
Solution Approach 2:
The airflow path is configured to flow transversely through the heating element rather than parallel to it. This dimensional change in airflow direction reduces the dwell time of air over the heating element surface, limiting droplet growth while maintaining efficient vapor collection through the porous structure.
2Productivity
If air flows over the heating element for vapor collection, then vapor generation is efficient, but droplets grow to excessive size
Solution Approach 1:
The vaporization chamber is divided into multiple plenum chambers that are separated from each other by partition walls. Each plenum chamber has its own vapor collection portion, creating multiple independent airflow paths. This segmentation allows the system to maintain high vapor production while limiting the dwell time in each individual path, preventing excessive droplet growth.
Solution Approach 2:
The airflow path is designed to quickly pass through the vaporization chamber with optimized geometry that minimizes the distance and time air spends in contact with the heating element. The plenum chambers and partition walls create a flow path that rushes air through the vapor collection zone efficiently, reducing dwell time while maintaining vapor collection effectiveness.
3Adaptability or versatility
If a porous sheet heating element is used, then liquid wicking and vaporization are integrated, but aerosol droplet size increases
Solution Approach 1:
The vaporization chamber is divided into multiple plenum chambers that are separated from each other by partition walls. Each plenum chamber has its own vapor collection portion, creating multiple independent airflow paths. This segmentation allows the system to maintain high vapor production while limiting the dwell time in each individual path, preventing excessive droplet growth.
Solution Approach 2:
The airflow path is configured to flow transversely through the heating element rather than parallel to it. This dimensional change in airflow direction reduces the dwell time of air over the heating element surface, limiting droplet growth while maintaining efficient vapor collection through the porous structure.
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 effectively limits aerosol droplet size, enhancing the quality of the aerosol inhaled by the user while maintaining high vapor production efficiency.
Implementation Method 1
a wicking element that draws liquid from the reservoir by capillary action
Implementation Method 2
when an electrical current is passed through the coil
Implementation Method 3
the heating element which vaporizes a small amount of the source liquid
Implementation Method 4
Air drawn into the device when a user inhales is carried over the heating element where it collects the vaporized source liquid to form an aerosol
Data Source
AI summary
An atomizer for a vapor provision system includes a vaporization chamber having a volume; a vapor generating element disposed in the vaporization chamber for providing vapor into the vaporization chamber volume; at least one plenum chamber separated from the vaporization chamber; and an air flow path through the atomizer including a vapor collecting portion through the vaporization chamber smaller than the volume, along which air travels to collect vapor provided by the vapor generating element, and at least one transport portion through a plenum chamber, the or each transport portion delivering air to or collecting air from the vapor collection portion.