Evaporator Temperature Gradient for Vapour Quality
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Solution Overview
Problem
Vapour generation devices face challenges in maintaining consistent vapour quality across different e-liquid compositions and ambient conditions, and struggle to efficiently vapourize a range of viscosities with existing evaporators, leading to clogging issues and reduced user experience.
Innovation Solution
An evaporator with a heating body featuring a plurality of channels that utilize capillary action and a positive temperature gradient, achieved through electrically conductive material and resistive heating, normalizes e-liquid viscosity and mitigates clogging by controlling bubble generation near the outlet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a uniform temperature is applied across the heating body, then the heating process is simple, but the vapour quality becomes inconsistent and clogging occurs throughout the channels
Solution Approach 1:
The heating body is designed with a temperature gradient where the outlet surface is hotter than the inlet surface. This local variation in temperature ensures that vaporization occurs primarily at the outlet where the liquid is already heated, preventing clogging throughout the channels while maintaining consistent vapour quality. The temperature distribution is non-uniform by design, with higher temperatures concentrated at the outlet region.
2Ease of operation
If the channel diameter is reduced to improve liquid transport control, then the liquid flow becomes more controlled, but the liquid viscosity increases and clogging risk increases
Solution Approach 1:
The patent changes the temperature parameter along the channel length, creating a gradient from cooler inlet to hotter outlet. This temperature change dynamically adjusts the liquid viscosity during flow through the channel. The liquid enters cooler (lower viscosity) and exits hotter (higher viscosity), but the controlled heating process prevents premature clogging while maintaining flow control in the narrower channels.
3Productivity
If the heating body is made longer to increase temperature exposure, then the vaporization efficiency improves, but the device length increases and liquid flow resistance increases
Solution Approach 1:
Instead of uniformly heating the entire length of the channel, the design concentrates the heating effect at the outlet surface. The temperature gradient is steepest at the outlet where vaporization occurs, allowing efficient vaporization in a shorter distance. This localized heating approach maintains high vaporization efficiency without requiring an excessively long channel, thus reducing overall device length and flow resistance.
4Ease of operation
If the channel diameter is increased to reduce liquid flow resistance, then the liquid flow becomes smoother, but the liquid viscosity decreases and vaporization quality deteriorates
Solution Approach 1:
The patent employs a temperature gradient that changes the liquid's thermal state along the channel. Even with larger channel diameters that reduce flow resistance, the progressive heating from inlet to outlet ensures the liquid reaches optimal vaporization temperature at the outlet. This parameter change compensates for the reduced temperature exposure time in wider channels, maintaining vaporization quality while allowing smoother liquid flow.
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 enhances vapour quality consistency, extends compatibility with various e-liquids, reduces noise and clogging, and increases the longevity of aerosol generating devices by ensuring smoother e-liquid flow and controlled vapourization.
Implementation Method 1
The channels are configured to transport liquid from the inlet surface through the heating body by capillary action
Implementation Method 2
The heating body comprises electrically conductive material and the evaporator further comprises circuitry for providing a current through the electrically conductive material to provide resistive heating of the heating body to evaporate a liquid passing through the channels
Implementation Method 3
The heating body and circuitry are configured to provide a positive temperature gradient across the heating body from the inlet surface to the outlet surface. When the evaporator is in use in an aerosol generating device, the e-liquid used in the device flows into the channel at the inlet surface as a liquid, and exits the channel at the outlet surface as a vapour. The positive temperature gradient from the inlet surface to the outlet surface causes the e-liquid to increase in temperature and decrease in viscosity as it flows through the channels
Implementation Method 4
The heating body and circuitry are configured to provide a positive temperature gradient across the heating body from the inlet surface to the outlet surface... to evaporate a liquid passing through the channels
Data Source
AI summary
An evaporator for an aerosol generating device is described. The evaporator comprises a heating body (101) comprising a plurality of channels (102) arranged through the heating body between an inlet surface (103) and an outlet surface (104). The channels are configured to transport liquid from the inlet surface through the heating body by capillary action. The heating body comprises electrically conductive material (120) and the evaporator further comprises circuitry (116) for providing a current through the electrically conductive material to provide resistive heating of the heating body to evaporate a liquid passing through the channels. The heating body and circuitry are configured to provide a positive temperature gradient across the heating body from the inlet surface to the outlet surface.