COMPUTATIONAL METHODOLOGIES FOR CONVECTION-DIFFUSION PHASE CHANGE PROBLEMS

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$50,000.00
Award Year:
1988
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
8180
Agency Tracking Number:
8180
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
1525-a Sparkman Drive, Huntsville, AL, 35816
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
() -
Business Contact:
() -
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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