Equiaxed dendritic solidification with convection. Part 3: Comparisons with NH{sub 4}Cl-H{sub 2}O experiments

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/BF02652371· OSTI ID:382527

Beckermann, C ^[1]; Wang, C Y ^[2]

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1. Univ. of Iowa, Iowa City, IA (United States). Dept. of Mechanical Engineering
2. Univ. of Hawaii, Honolulu, HI (United States). Dept. of Mechanical Engineering

This third article on equiaxed dendritic solidification is intended to provide experimental validation of the multiphase model developed in part 1. Numerical and experimental results are presented for the solidification of a NH{sub 2}Cl-70 wt pct H{sub 2}O solution inside a square cavity cooled equally from all sidewalls. The numerical simulations were preformed using the numerical procedures developed in part 2. The experiments were conducted to measure the temperature histories via thermocouples and to record the images of the solidification process using a shadowgraph system. Preliminary validity of the multiphase model is demonstrated by the qualitative agreement between the measurements and predictions of cooling curves as well as of the evolution of the crystal sediment bed. In addition, several important features of equiaxed dendritic solidification are identified through this combined experimental and numerical study, including the grain generation and growth behaviors in the presence of liquid flow, the sedimentation of equiaxed crystals, the formation of a crystal sediment bed, and a bottom zone of negative segregation resulting from the countercurrent solid-liquid multiphase flow. Quantitative comparisons between the numerical simulation and experiment reveal several areas for future research.

• Sponsoring Organization: USDOE
• OSTI ID: 382527
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 9 Vol. 27; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMMONIUM CHLORIDES
AQUEOUS SOLUTIONS
CORRELATIONS
GRAIN GROWTH
HEAT TRANSFER
LIQUIDS
MATHEMATICAL MODELS
NUCLEATION
NUMERICAL ANALYSIS
PREDICTION EQUATIONS
SIMULATION
SOLIDIFICATION
SOLIDS
VALIDATION