Solute Layers and Double-Diffusive Interfaces during the Solidification of NH{sub 4}Cl-H{sub 2}O in Rectangular Cavities
- State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University (China)
Flow and temperature fields during the solidification of hypereutectic and hypoeutectic NH{sub 4}Cl-H{sub 2}O solution in rectangular cavities were measured by a particle image velocimetry(PIV) and a weak perturbation thermocouple network, respectively. Double-diffusive convections caused by the coupling effects of temperature and solute gradients were studied by the experiment. During the solidification of hypereutectic solution, the rejected water near the solidification interface will lead to dilute solute layers and double-diffusive interfaces. As the continued rejection of water, the layer and interface will evolve into instability and a multi-layer and multi-interface structure will be formed. To the hypoeutectic solution, the rejection of NH{sub 4}Cl near the solidification interface will form a dense solute layer. When the thickness of the dense solute layer is large enough, the coupling effects of stabilizing solute gradient and unstable temperature gradient will lead to new solute layers. The solute layers and double-diffusive interfaces will evolve stably and have no breakup of the double-diffusive interfaces during the solidification of hypoeutectic solution.
- OSTI ID:
- 21371664
- Journal Information:
- AIP Conference Proceedings, Vol. 1207, Issue 1; Conference: 6. international symposium on multiphase flow, heat mass transfer and energy conversion, Xian (China), 11-15 Jul 2009; Other Information: DOI: 10.1063/1.3366477; (c) 2010 American Institute of Physics; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMMONIUM CHLORIDES
CONVECTION
COUPLING
DIFFUSION
EUTECTICS
IMAGES
INSTABILITY
INTERFACES
LAYERS
SOLIDIFICATION
SOLUTES
SOLUTIONS
TEMPERATURE GRADIENTS
WATER
AMMONIUM COMPOUNDS
AMMONIUM HALIDES
CHLORIDES
CHLORINE COMPOUNDS
DISPERSIONS
ENERGY TRANSFER
HALIDES
HALOGEN COMPOUNDS
HEAT TRANSFER
HOMOGENEOUS MIXTURES
HYDROGEN COMPOUNDS
MASS TRANSFER
MIXTURES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS