COMPUTATIONAL METHODOLOGIES FOR CONVECTION-DIFFUSION PHASE CHANGE PROBLEMS

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: N/A
Agency Tracking Number: 8180
Amount: $50,000.00
Phase: Phase I
Program: SBIR
Awards Year: 1988
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
1525-a Sparkman Drive, Huntsville, AL, 35816
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
THE OBJECTIVE OF THIS PROJECT WAS TO DEVELOP NUMERICAL METHODOLOGIES FOR ANALYZING SOLID-LIQUID PHASE CHANGE PROBLEMS INVOLVING MULTI-COMPONENT MATERIALS SUCH AS BINARY MIXTURES AND ALLOYS. THE POTENTIAL NASA INTEREST FOR THIS WORK STEMS FROM MATERIALS SCIENCE APPLICATIONS IN SPACE, E.G. CRYSTAL GROWTH. THE AIM OF PHASE I WAS TO DEFINE A FRAMEWORK FOR DEVELOPMENTOF A GENERAL PURPOSE COMPUTER PROGRAM BY EXAMINING BOTH SINGLE-AND TWO-PHASE MODELS. THE SINGLE-PHASE MODEL EQUATIONS ARE RELATIVELY EASY TO SOLVE BUT REQUIRE A PRESCRIPTION OF THE SOLID PHASE-VELOCITY AND OTHER ASSUMPTIONS FOR COMPUTING THE LOCAL MASS FRACTIONS OF THE PHASES. THE TWO-PHASE MODEL DOES NOT HAVE THESE SHORTCOMINGS BUT NEEDS DATA ON INTERFACIAL EXCHANGE COEFFICIENTS WHICH REQUIRE FURTHER RESEARCH. THE PROBLEM OF FREEZING IN A SQUARE WAS STUDIED TO ILLUSTRATE THE USE OFTHE SINGLE- AND TWO-PHASE MODELS. THE CONCLUSION DRAWN FROMTHIS WORK IS THAT A GENERAL PURPOSE CODE FOR BINARY SOLID-LIQUID PHASE CHANGE PROBLEMS MUST INCLUDE BOTH SINGLE-AND TWO-PHASE OPTIONS.

* Information listed above is at the time of submission. *

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