Oscillation and collective behavior in convective flows

TL;DR

This paper investigates oscillations and collective behaviors in convection-driven helium gas columns, revealing how flow parameters influence oscillation frequency and demonstrating synchronization phenomena similar to flickering flames.

Contribution

It provides experimental insights into the oscillatory behavior of convective helium columns and introduces a simple hydrodynamic model to explain the observed phenomena.

Findings

Oscillation frequency decreases with larger nozzle diameter.

Flow rate increases lead to higher oscillation frequencies.

Close helium columns exhibit anti-phase synchronization and beating.

Abstract

Oscillation and collective behavior in convection-driven fluid columns are investigated and discussed in analogy with similar phenomenon observed for the flickering flames of candle bundles. It is shown experimentally that an ascending circular Helium gas column performs an oscillation which is similar in several aspects to the oscillation of diffusion flames. Increasing the nozzle diameter leads to a decrease in the oscillation frequency, while increasing the flow rate results in an increase in this frequency. For helium columns oscillating at nearby frequency and placed close to each other anti-phase synchronization and beating phenomena is observed. A simple toy-model based on elementary hydrodynamics describes the observed oscillations and leads to oscillation frequencies in the right order of magnitude.