51. The hysteresis phenomena of flow patterns due to thermal and solutal marangoni convections in a liquid bridgeunder zero gravity
- Author
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S Dost, Hisashi Minakuchi, and Yasunori Okano
- Subjects
Physics::Fluid Dynamics ,Convection ,Hysteresis ,Marangoni effect ,Materials science ,Flow (mathematics) ,PISO algorithm ,Initial value problem ,Marangoni number ,Zero gravity ,Mechanics - Abstract
The hysteresis phenomenon of flow patterns due to thermal and solutal Marangonis convection in a liquid bridge under zero gravity was numerically simulated A three dimensional half zone configuration of the Floating Zone FZ formed between hot and cold discs was considered The field equations continuity momentum energy and mass transport equations were solved numerically by the PISO algorithm and the open source software OpenFOAM was used Three sets of initial conditions were used The first is the conditions of no flow and constant solutal Marangoni numbers the other two are the gradually increasing or decreasing solutal Marangoni numbers Results showed that the flow becomes D unstable at a larger solutal Marangoni number than the critical number MaC cr and the MaC crdepends on the initial condition The flow structure clearly shows hysteresis behavior of the flow field with about difference between the critical values in the hysteresis diagram
- Published
- 2018
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