In situ LIF temperature measurements in aqueous ammonium chloride solution during uni-directional solidification |
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Authors: | M Behshad Shafii Chee L Lum Manoochehr M Koochesfahani |
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Institution: | (1) Department of Mechanical Engineering, Michigan State University, East Lansing, MI 48824, USA;(2) Present address: Mechanical Engineering Department, Sharif University of Technology, Azadi St., 14588-89694 Tehran, Iran;(3) Present address: BD Medical, Franklin Lakes, NJ 07417, USA; |
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Abstract: | 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. |
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