On the interface instability during rapid evaporation in microgravity

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The rapid evaporation of a superheated liquid (vapor explosion) under microgravity conditions is studied by direct numerical simulation. The time-dependent Navier-Stokes and energy equations coupled to the interface dynamics are solved using a two-dimensional finite-difference/front-tracking method. Large interface deformations, topology change, latent heat, surface tension and unequal material properties between the liquid and vapor phases are included in the simulations. A comparison of numerical results to the exact solution of a one-dimensional test problem shows excellent agreement. For the two-dimensional rapid evaporation problem, the vapor volume growth rate and unstable interface dynamics are studied for increasing levels of initial liquid ... continued below

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12 p.

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Juric, D. May 1, 1997.

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  • Juric, D. Los Alamos National Lab., NM (United States). Theoretical Div.

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Description

The rapid evaporation of a superheated liquid (vapor explosion) under microgravity conditions is studied by direct numerical simulation. The time-dependent Navier-Stokes and energy equations coupled to the interface dynamics are solved using a two-dimensional finite-difference/front-tracking method. Large interface deformations, topology change, latent heat, surface tension and unequal material properties between the liquid and vapor phases are included in the simulations. A comparison of numerical results to the exact solution of a one-dimensional test problem shows excellent agreement. For the two-dimensional rapid evaporation problem, the vapor volume growth rate and unstable interface dynamics are studied for increasing levels of initial liquid superheat. As the superheat is increased the liquid-vapor interface experiences increasingly unstable energetic growth. These results indicate that heat transfer plays a very important role in the instability mechanism leading to vapor explosions. It is suggested that the Mullins-Sekerka instability could play a role in the instability initiation mechanism.

Physical Description

12 p.

Notes

OSTI as DE97005030

Source

  • International mechanical engineering congress and exposition, Dallas, TX (United States), 16-21 Nov 1997

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  • Other: DE97005030
  • Report No.: LA-UR--97-918
  • Report No.: CONF-971115--1
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/537364 | External Link
  • Office of Scientific & Technical Information Report Number: 537364
  • Archival Resource Key: ark:/67531/metadc689888

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  • May 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • June 23, 2016, 12:35 p.m.

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Juric, D. On the interface instability during rapid evaporation in microgravity, report, May 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc689888/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.