Oscillatory thermocapillary flows in simulated floating zones with time-dependent boundary conditions

R. Monti, R. Savino, M. Lappa

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

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Abstract

This study deals with numerical simulations of the Maxus sounding rocket experiment on oscillatory Marangoni convection in liquid bridges. The problem is investigated through direct numerical solution of the non-linear, time-dependent, three-dimensional Navier-Stokes equations. In particular a liquid bridge of silicon oil 2[cs] with a lenght L = 20 [mm] and a diameter D = 20 [mm] is considered. A temperature difference DT= 30 [K] is imposed between the supporting disks, by heating the top disk and cooling the bottom one with different rates of ramping.
The results show that the oscillatory flow starts as an "axially running wave" but after a transient time the instability is described by the dynamic model of a "standing wave", with an azimuthal spatial distribution corresponding to m=1 (where m is the critical wave number).
After the transition, the disturbances become larger and the azimuthal velocity plays a more important role and the oscillatory field is characterized by a travelling wave.
The characteristic times for the onset of the different flow regimes are computed for different rates of ramping.
Original languageEnglish
Title of host publication47th Congress of the International Astronautical Federation, Beijing, China, 7-11 Oct. 1996
Number of pages14
Publication statusPublished - 1996
Event47th International Astronautical Congress - Beijing, China
Duration: 7 Oct 199611 Oct 1996

Conference

Conference47th International Astronautical Congress
CountryChina
CityBeijing
Period7/10/9611/10/96

Keywords

  • thermocapillary flows
  • simulated floating zones

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