Capillary Jet Emulsion Device for Micron Droplets
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Solution Overview
Problem
Current methods for generating micro- and submicrometric emulsions face limitations such as dependency on electrical properties, low productivity, alignment issues with flow-focusing devices, and inability to produce droplets smaller than 5 microns, particularly in the food, pharmaceutical, and chemical industries.
Innovation Solution
A device and process utilizing coaxial flow of immiscible liquids with a viscous outer fluid to form capillary jets, which break up into monodisperse micrometre-sized droplets, eliminating the need for electric fields and addressing geometrical focusing problems, allowing for controlled production of simple and compound emulsions with controllable diameters and coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electrospraying is used to produce micrometre-sized emulsions, then droplet size control is improved, but productivity deteriorates due to low mass flow rate
Solution Approach 1:
The invention replaces the electrospraying method (which uses electrical fields) with a purely mechanical flow-focusing system. The capillary tube array focuses the inner liquid stream mechanically through geometric constraints, eliminating the need for electrical fields while maintaining precise droplet size control through the capillary dimensions and flow rates.
2Manufacturing precision
If flow-focusing devices with three-dimensional geometries are used, then droplet size control is improved, but device complexity increases
Solution Approach 1:
The invention segments the flow-focusing function into multiple independent capillary tubes arranged in an array. Each capillary tube independently focuses a portion of the inner liquid stream, and their combined effect produces the desired droplet size control. This segmentation simplifies the overall device geometry compared to complex three-dimensional focusing structures while maintaining precision.
3Manufacturing precision
If electrospraying is used to achieve droplet sizes below 5 microns, then manufacturing precision is improved, but device complexity and operational constraints increase
Solution Approach 1:
The invention replaces the electrical field-based electrospraying mechanism with a mechanical flow-focusing mechanism using capillary tubes. This substitution eliminates the dependency on electrical properties of the liquid, providing physical-chemical parametric freedom while achieving droplet sizes below 5 microns through purely mechanical means.
4Manufacturing precision
If flow-focusing devices with alignment requirements are used, then manufacturing precision is improved, but ease of operation deteriorates due to alignment sensitivity
Solution Approach 1:
The invention segments the focusing function into multiple capillary tubes that can be independently positioned and aligned. This segmentation allows for modular assembly and adjustment, reducing the overall alignment sensitivity compared to single complex focusing structures. Each capillary tube operates independently, so minor misalignments do not compromise the entire system.
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
Enables the production of stable, uniform, and continuous emulsions with droplet sizes ranging from 10 to 100 microns, addressing the limitations of existing technologies by achieving efficient and scalable generation of micrometre-sized emulsions without the need for electric fields or complex geometries.
Implementation Method 1
a capillary micro-jet when a liquid or two immiscible or barely miscible liquids that flow coaxially are suctioned by means of a viscous outer liquid
Implementation Method 2
the action of the co-flowing outer liquid and the favourable pressure gradient that it produces
Implementation Method 3
This simple jet breaks up due to capillary instability, to produce droplets of a micro- and submicrometric size
Data Source
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AI summary
The invention relates to a method for producing simple and compound emulsions having micrometre-sized, controllable diameters and coatings, using a device formed by elements having characteristic dimensions of the order of a millimetre. The emulsions are produced using the suction produced by the flow of a viscous liquid through the section of a millimetre-sized capillary tube. According to a parametric analysis, the liquid or the pair of liquids to be emulsified form a simple or compound steady capillary jet of micrometre diameter, by the action of the co-flow of the emulsifying liquid and the favourable pressure gradient produced. The jet breaks because of capillary instability, forming simple or compound monodisperse micro-drops. The invention disclosed in this description can be used in industrial sectors where the production of simple and compound, monodisperse, homogeneous emulsions having micrometric-sized, controllable diameters and coatings is an essential part of the process.