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The effect of periodic lid-driven flow on suppressing the double-diffusive convection during solidification of a liquid binary alloy.

Number: pap. C4-140

Author(s) : SHIH Y. C., TU S. M., LI M. H.

Summary

In the past, one of the main issues to study the solidification of a liquid binary alloy focused on how to suppress “double-diffusive convection” because it is the main reason to cause the poor quality of alloys. This study proposes a possible way to erase or reduce the double-diffusive convection by imposing a periodic lid-driven flow on the top of a square test cell to observe the development of the double-diffusive convection during the solidification of a hypereutectic aqueous ammonium chloride (NH4Cl-H2O) solution. Cooling processes from the bottom and from the lateral side of the test cell are considered in this paper. The flow visualization by shadowgraph technique and measurement of temperature distribution were conducted during solidification. The experimental results of the solidification process from the bottom revealed that increasing the speed of period lid-driven flow can reduce the strength of double-diffusive convection effectively. For periodic lid-driven velocity with 5.3 cm/sec, the number of plumes was reduced by 67% as compared to that without an externally imposed periodic lid-driven flow. Moreover, the periodic lid-driven flow forced the double-diffusive layers to move downward in the case of lateral cooling, which could improve the quality of final metal product.

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Pages: 9 p.

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Details

  • Original title: The effect of periodic lid-driven flow on suppressing the double-diffusive convection during solidification of a liquid binary alloy.
  • Record ID : 30005161
  • Languages: English
  • Source: ACRA2010. Asian conference on refrigeration and air conditioning: Tokyo, Japan, June 7-9, 2010.
  • Publication date: 2010/06/07

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