Figure 12.

Instantaneous temperature contours and velocity vectors in a vertical plane over the heated wall of a cuboidal convection sample, from Schmeling et al. [89]. For the sake of clarity, only every second vector is shown in each direction. Recorded for a Prandtl number $Pr=0.71$, a Reynolds number $Re=0$ and a Rayleigh number $Ra=9\times {10}^7$. Reprinted by permission from Ref. [89], Measurement Science and Technology, Copyright © 2022 IOP Publishing Ltd.