Details

Autor(en) / Beteiligte

• Huang, Ze-Lin
• Wu, Jian-Zhao
• Guo, Xi-Li
• Zhao, Chao-Ben
• Wang, Bo-Fu
• Chong, Kai Leong
• Zhou, Quan

Titel

Unifying constitutive law of vibroconvective turbulence in microgravity

Ist Teil von

• Journal of fluid mechanics, 2024-05, Vol.987, Article A14

Ort / Verlag

Cambridge, UK: Cambridge University Press

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We report the unified constitutive law of vibroconvective turbulence in microgravity, i.e. $Nu \sim a^{-1} Re_{os}^\beta$ where the Nusselt number $Nu$ measures the global heat transport, $a$ is the dimensionless vibration amplitude, $Re_{os}$ is the oscillational Reynolds number and $\beta$ is the universal exponent. We find that the dynamics of boundary layers plays an essential role in vibroconvective heat transport and the $Nu$-scaling exponent $\beta$ is determined by the competition between the thermal boundary layer (TBL) and vibration-induced oscillating boundary layer (OBL). Then a physical model is proposed to explain the change of scaling exponent from $\beta =2$ in the TBL-dominant regime to $\beta = 4/3$ in the OBL-dominant regime. Our finding elucidates the emergence of universal constitutive laws in vibroconvective turbulence, and opens up a new avenue for generating a controllable effective heat transport under microgravity or even microfluidic environment in which the gravity effect is nearly absent.