Microfluidic Cartridge Airflow Nozzle Blockage Prevention
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Solution Overview
Problem
Microfluidic delivery devices face issues with fluid composition droplets breaking into smaller droplets or forming tails that can deposit back onto the microfluidic die, causing blockages in nozzles.
Innovation Solution
A microfluidic delivery device equipped with a fan that generates air flow to direct the fluid composition away from the die, using a housing with air and fluid outlets to ensure the composition is propelled into the air, minimizing deposition back onto the die.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fluid composition is dispensed from the microfluidic die, then the fluid composition is delivered into the air, but droplets break into smaller droplets or form tails that fall back onto the microfluidic die causing nozzle blockages
Solution Approach 1:
A tailless droplet formation structure is introduced as an intermediary between the microfluidic die and the ambient air. This structure modifies the droplet formation process by providing a controlled environment that prevents tail formation and droplet breakup, ensuring clean droplet ejection without direct interaction between the die and atmospheric conditions
Solution Approach 2:
Pressurized gas is used to blow across the droplet formation region, creating a controlled fluid dynamic environment. The gas flow prevents droplet tails from forming and eliminates small droplets that would otherwise fall back onto the die, thereby maintaining nozzle functionality while enabling continuous fluid composition delivery
2Reliability
If air flow is used to propel fluid composition into the air, then deposition back onto the die is minimized, but device complexity increases with additional fan and air outlet components
Solution Approach 1:
The housing structure is designed to serve multiple functions: it provides structural support, directs air flow from the fan through strategically positioned outlets, and creates the pressurized gas environment needed for tailless droplet formation. By integrating these functions into a single component, the overall device complexity is minimized
Solution Approach 2:
The fan and air outlet system creates a controlled pneumatic environment that serves dual purposes: propelling droplets away from the die and preventing tail formation at the source. This pneumatic approach consolidates multiple protective functions into a single mechanism, reducing the need for additional complex components
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
Effectively prevents fluid composition from depositing back onto the microfluidic die, maintaining nozzle functionality and improving the delivery process by using air flow to direct droplets outward and upward.
Implementation Method 1
A microfluidic delivery device equipped with a fan that generates air flow to direct the fluid composition away from the die
Data Source
AI summary
A microfluidic delivery device and method of dispensing a fluid composition from a microfluidic die are provided. The method includes generating air flow from a fan; directing a first portion of the air flow through a first air outlet in a housing; directing a second portion of the air flow through a second air outlet in the housing; jetting a fluid composition from a microfluidic die through a fluid orifice in the housing; directing the second portion of air flow adjacent to the microfluidic die and out the fluid outlet, wherein the first portion of the air flow directs the fluid composition jetted out of the fluid outlet into the air.