Long-term microgravity experiments reveal a new mechanism for particle aggregation in suspension

TL;DR

This study combines long-term microgravity experiments and simulations to discover that onboard oscillations significantly accelerate particle aggregation in suspensions, revealing a new mechanism influencing flocculation.

Contribution

The paper uncovers that g-jitter-induced oscillations in microgravity environments accelerate particle aggregation, a mechanism previously unrecognized in suspension dynamics.

Findings

Oscillations accelerate aggregate growth compared to Brownian motion.

Growth rate depends on oscillation amplitude and solid volume fraction.

Microgravity experiments and simulations corroborate the new aggregation mechanism.

Abstract

Microgravity experiments on board the International Space Station, combined with particle-resolved direct numerical simulations, were conducted to investigate the long-term flocculation behavior of clay suspensions in saline water in the absence of gravity. After an initial homogenization of the suspensions, different clay compositions were continuously monitored for 99 days, allowing a detailed analysis of aggregate growth through image processing. The results indicate that the onboard oscillations (g-jitter) may have accelerated the aggregation process. Aggregate growth driven by these oscillations is found to occur at a faster rate than aggregation caused by Brownian motion. This effect is further confirmed by numerical simulations, which also demonstrated that parameters such as the oscillation amplitude and the solid volume fraction influence growth acceleration. These findings highlight that oscillations may act as a previously unrecognized mechanism that contributes to particle aggregation in fluids.