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In situ LIF temperature measurements in aqueous ammonium chloride solution during uni-directional solidification

Shafii, M. B ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1007/s00348-009-0758-7
  3. Publisher: 2010
  4. Abstract:
  5. We present in situ whole-field measurements of the temperature field using laser-induced fluorescence in a study of bottom-chilled uni-directional solidification of aqueous ammonium chloride. We utilize a two-color, two-dye, ratiometric approach to address the significant spatial and temporal variations of laser sheet intensity field due to refractive index variations caused by the evolving concentration and temperature fields. In our work we take advantage of two temperature sensitive fluorescent dyes with opposite temperature sensitivities in order to increase the overall sensitivity and temperature resolution of the measurements. The resulting temperature sensitivity (about 4% K-1) is more than a factor of two higher than the original work of Sakakibara and Adrian (Exp Fluids 26:7-15, 1999) with a sensitivity 1.7% K -1. In situ measurements of the temperature field during solidification are presented, along with temperature characteristics of some of the complex flow features, such as plumes and fingers
  6. Keywords:
  7. Aqueous ammonium ; Complex flow ; Field measurement ; Fluorescent dyes ; In-situ ; In-situ measurement ; Laser induced fluorescence ; Laser sheets ; Ratiometric ; Refractive index variations ; Spatial and temporal variation ; Temperature characteristic ; Temperature field ; Temperature resolution ; Temperature sensitivity ; Two-color ; Two-temperature ; Unidirectional solidification ; Chlorine compounds ; Crystallization ; Fluorescence ; Refractive index ; Solidification ; Temperature measurement ; Ammonium compounds
  8. Source: Experiments in Fluids ; Volume 48, Issue 4 , April , 2010 , Pages 651-662 ; 07234864 (ISSN)
  9. URL: http://link.springer.com/article/10.1007/s00348-009-0758-7