Microfluidic Delivery System Using Periodic Thermal Pulses
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Solution Overview
Problem
Existing microfluidic delivery systems fail to efficiently deliver sufficient quantities of fluid compositions into the air while minimizing deposition on adjacent surfaces, which is necessary for effectively freshening a room or living space.
Innovation Solution
A microfluidic delivery system comprising a microfluidic die with a plurality of nozzles and a heating element that receives electrical firing pulses, allowing for precise control of firing duration and frequency to dispense fluid compositions into the air as microdroplets, minimizing surface deposition through a combination of thermal energy and precise droplet formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional atomization systems or ink jet spray heads are used to deliver fluid compositions, then some fluid delivery is achieved, but insufficient quantities are delivered into the air while excessive deposition occurs on adjacent surfaces
Solution Approach 1:
The heating element is activated by periodic electrical firing pulses at frequencies between 100 Hz to 6000 Hz with pulse widths of 1-3 microseconds. This periodic thermal action creates consistent microdroplet ejection cycles that optimize fluid delivery into the air while controlling deposition patterns on surrounding surfaces.
Solution Approach 2:
The system utilizes rapid parameter changes by applying high-frequency electrical pulses (100-6000 Hz) with extremely short duration (1-3 microseconds) to the heating element. These parameter changes create transient thermal conditions that generate microdroplets with optimal trajectories for air delivery while minimizing surface deposition.
2Quantity of substance
If higher quantities of fluid composition are delivered into the air, then room freshening effectiveness is improved, but deposition on adjacent surfaces increases
Solution Approach 1:
The fluid composition is segmented into numerous microdroplets through the microfluidic nozzles (e.g., 10-100 micrometer diameter nozzles). This segmentation creates a dispersed spray pattern that increases the quantity of fluid delivered into the air while reducing individual droplet mass and minimizing deposition on adjacent surfaces through broader distribution.
Solution Approach 2:
The periodic electrical pulsing at high frequencies creates repeated microdroplet ejection cycles, accumulating sufficient total fluid quantity delivered into the air over time while the brief pulse duration prevents excessive fluid accumulation that would lead to surface deposition.
3Productivity
If thermal energy is applied to generate microdroplets, then droplet formation and delivery into air is improved, but energy consumption increases
Solution Approach 1:
Instead of continuous heating, the system applies periodic electrical pulses with very short duration (1-3 microseconds) at controlled frequencies (100-6000 Hz). This periodic activation creates microdroplets only when needed, significantly reducing overall energy consumption compared to continuous thermal application while maintaining effective microdroplet formation efficiency.
Solution Approach 2:
The system applies partial thermal action through brief electrical pulses that provide just enough energy to generate the required microdroplets without excessive heating. The short pulse width (1-3 microseconds) delivers sufficient thermal energy for microdroplet formation while avoiding energy waste from prolonged heating.
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 system effectively delivers fluid compositions into the air with minimal deposition on surfaces, providing efficient room freshening by controlling droplet size and trajectory through the use of thermal energy and precise electrical firing pulses.
Implementation Method 1
at least one heating element configured to receive an electrical firing pulse
Implementation Method 2
delivering a fluid composition into the air by means of a microfluidic delivery system... dispense fluid compositions into the air as microdroplets
Data Source
AI summary
Microfluidic delivery systems for dispensing a fluid composition into the air comprising microfluidic die and at least one heating element that is configured to receive an electrical signal comprising a certain on-time and wave form to deliver a fluid composition into the air.