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Nanobubble Formation by Flow Regime Switching Using a Tesla Valve.

George Joseph¹, Bincy Binny¹, Andre R Venter¹

¹Department of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008-5413, United States.

|May 5, 2025

Summary

This summary is machine-generated.

A novel Tesla valve method efficiently generates nanobubbles (NBs) in the 100-200 nm range. This cost-effective technique offers promising scalability and low energy consumption for industrial applications.

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Area of Science:

Materials Science
Fluid Dynamics
Nanotechnology

Background:

Nanobubbles (NBs) are gas cavities in solution with diameters around 200 nm, exhibiting unique properties for diverse applications.
Current laboratory-scale methods for NB generation include ultrasonication and pressure cycling, each with limitations.

Purpose of the Study:

To introduce and evaluate a novel, cost-effective method for nanobubble generation using flow regime cycling through a Tesla valve.
To compare the performance of the Tesla valve method with existing techniques (ultrasonication, pressure cycling) in terms of bubble characteristics.

Main Methods:

Nanobubbles were generated using CO2 or N2 via flow regime switching through a Tesla valve, ultrasonication, and pressure cycling.
Bubble diameter was measured using Nanoparticle Tracking Analysis (NTA).
Bubble concentration and zeta potential were also quantified for comparative analysis.

Main Results:

The Tesla valve method produced CO2 nanobubbles with an average diameter of 110 nm, comparable to sonication.
Bubble concentration for the Tesla valve method was 3.8 × 10^8 bubbles/mL, higher than sonication but lower than pressure cycling.
Zeta potential was measured at -33 mV, indicating favorable surface charge characteristics.

Conclusions:

Flow cycling through a Tesla valve is an effective method for generating nanobubbles in the 100-200 nm range.
This technique demonstrates favorable comparison to alternative laboratory methods, with potential for low energy consumption and scalability.
The Tesla valve method presents a promising alternative for cost-effective and scalable nanobubble production.