Abstract
Microgravity experiments on Marangoni convection in a liquid bridge of high-Prandtl-number fluid so-called Marangoni Experiment in Space (MEIS) and Dynamic Surf (DS) were performed on board the International Space Station (ISS) to understand the Marangoni convection instability. This study reports the internal flow patterns and velocity profiles of the axisymmetric steady Marangoni convection observed in these projects for various Prandtl numbers (Pr = 67, 112 and 207), and for various liquid bridge geometries. The classical three-dimensional particle tracking velocimetry (3-D PTV) is customized for the microgravity experiments, and the spatial structures of the Marangoni convection in liquid bridges are measured with good accuracy. The details of the measurement method currently used, and the results of the 3-D PTV are discussed in this study.
