Microfluidic-based apparatus and method for vaporization of liquids
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Solution Overview
Problem
Conventional vaporizers lack precise control over vaporization temperature profiles and spatial distribution of vapor, leading to inefficient and variable performance, particularly in applications requiring controlled dosing and thermodynamic efficiency.
Innovation Solution
A microfabricated vaporization apparatus with thin structural regions and resistive heating elements, featuring a thin-film resistive heating element and inverse opal wicking structures, allows for precise temperature control and efficient vaporization by minimizing thermal energy loss and optimizing heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional vaporization techniques are used, then vaporization can occur, but precise control over vaporization temperature profiles and spatial distribution of vapor cannot be achieved
Solution Approach 1:
The heating element is divided into multiple independent resistive heating zones that can be individually controlled. Each zone can be independently activated or deactivated to create precise spatial distribution patterns of vapor, allowing independent control of temperature in different regions of the vaporization chamber.
Solution Approach 2:
The system dynamically adjusts the temperature profile by selectively activating different heating zones based on real-time requirements. The control system can modify which zones are active and at what power levels, enabling dynamic optimization of vaporization temperature profiles for different operating conditions and vapor delivery requirements.
2Loss of energy
If conventional vaporization methods are used, then vapor production is achieved, but thermodynamic efficiency is poor due to uncontrolled thermal energy loss
Solution Approach 1:
Heat is applied locally at the vaporization chamber walls rather than heating a large bulk volume. The resistive heating elements are positioned to create localized thermal zones exactly where vaporization occurs, minimizing thermal energy loss to surrounding structures and improving overall thermodynamic efficiency by concentrating energy where it is most needed.
Solution Approach 2:
The system maintains continuous vaporization by keeping the liquid reservoir continuously supplied and the heating zones continuously active at optimized power levels. This ensures steady-state operation where thermal energy is continuously and efficiently converted to vapor without interruption or waste from startup/shutdown cycles.
3Measurement precision
If conventional vaporizers are used, then vaporization occurs, but controlled and accurate dosing of vapor cannot be achieved
Solution Approach 1:
The control system monitors vapor production from each heating zone and adjusts the power delivery to maintain precise dosing. By measuring actual vapor output and comparing it to target values, the system can make real-time adjustments to heating power, ensuring accurate and consistent vapor delivery while maintaining simple user operation through automated control.
4Manufacturing precision
If traditional vaporizer designs are used, then vaporization is achieved, but unit-to-unit reproducibility and manufacturing scalability are limited
Solution Approach 1:
The system replaces complex mechanical vaporization components with microfabricated resistive heating elements and integrated fluidic channels. These can be manufactured using standard semiconductor fabrication techniques, enabling precise control over geometric dimensions, consistent material properties, and high-volume production with excellent unit-to-unit reproducibility.
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
The solution enables well-controlled vaporization with reduced thermal stress, improved thermodynamic efficiency, and precise dosing of vaporized materials, enhancing performance across various applications such as fragrance distribution, medical vaporization, and electronic cigarettes.
Implementation Method 1
at least one heating element that may be in thermal communication to the at least one vaporization port
Implementation Method 2
a thin structural region, with a thickness varying from 1 um to 100 um
Implementation Method 3
vaporize liquid into the surrounding environment, including at least one liquid source, at least one vaporization port
Data Source
AI summary
Methods and apparatus for vaporizing liquid into the surrounding environment, including directing liquid from a liquid source through an inverse-opal wicking structure to a vaporization port where the vaporization port is formed by a through-hole in a structure connecting a first side of the structure to a second side, with all dimensions ranging from 10 um to 300 um, that is in fluid communication with the liquid source and the surrounding environment so that fluid is transported through the vaporization port between the first and the second side. The methods and apparatus includes plurality of heating elements that may be individually and/or selectively addressable by at least three electrode leads.