Experimental Study on the Influence of Interfacial Energy Instability on the Flow Pattern Spatiotemporal Evolution of Thermal- Buoyant Capillary Convection

The effect of the instability interface morphology due to mechanical disturbances and acceleration changes (or gravity flutter) on Marangoni convective stability has been confirmed via space experiments. However, compared with research convection an axisymmetric liquid bridge, transition flow behavior a non-axisymmetric bridge is not sufficiently deep. Based thermal-buoyant capillary (TBCC) experiment conventional in this study, influence interfacial energy triggered by gravitational tilt angle (GTA) spatiotemporal evolution pattern velocity distribution examined applying GTA form model. results show that non-equilibrium change curvature leads morphology. With increasing GTA, cell-flow during development process restricted, transverse/longitudinal component suppressed, peak value position gradually approaches interface. In oscillating TBCC stage, deviation cell vortex cores from intermediate height intensifies resulting expansion alternating zone center. Furthermore, longitudinal transformed into “two peaks one valley” (“M”-type) original multi-peak can increase critical temperature difference TBCC, maintain its stability, delay onset flow. Simultaneously, oscillation frequency reduced suppressed.