Bimodal Droplet-Based Electricity Generation Through Semi Cassini Oval Dynamic Morphology Control

Area of Science:

• Energy Harvesting
• Fluid Dynamics
• Materials Science

Background:

• Droplet-based electricity generators (DEGs) offer promising energy harvesting solutions.
• Optimizations have focused on materials and structures, neglecting droplet dynamics.
• Controlling droplet morphology is key to enhancing DEG performance.

Purpose of the Study:

• To investigate droplet spread-retraction dynamics and morphology in DEGs.
• To design a novel electrode system that exploits droplet morphology for improved energy generation.
• To demonstrate enhanced electrical output by controlling droplet-electrode interactions.

Main Methods:

• Characterization of droplet spread-retraction dynamics and semi Cassini oval (SCO) formation.
• Design and implementation of a lifted top electrode (LTE) to interact with the dynamic SCO morphology.
• Measurement and comparison of electrical output from the novel LTE-DEG and traditional DEGs.

Main Results:

• The droplet's dynamic spread-retraction forms a unique semi Cassini oval (SCO) morphology.
• The LTE interacts with the SCO in two distinct phases, generating bimodal voltage peaks.
• The proposed LTE-DEG shows a 25% increase in peak-to-peak voltage and a 33% increase in average power compared to traditional DEGs.

Conclusions:

• Controlling droplet dynamics and morphology significantly enhances DEG energy harvesting.
• The LTE-DEG design effectively utilizes individual droplet energy through morphology-driven interactions.
• This approach offers a new strategy for boosting DEG power output by optimizing droplet behavior.