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8/13/2019 Identification of Interfacial Heat Transfer Coefficient During Casting
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IDENTIFICATION OF INTERFACIAL HEAT TRANSFER CO(IHTC) DURING CASTING SOLIDIFICATION BASED ON INV
CONDUCTION MODEL
K Sriniv13M
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Presentation Outline:
Why Interfacial heat transfer coefficient Why Inverse heat transfer method What is interfacial heat transfer coefficient Case study Results
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The interfacial heat transfer coefficients arerequired for accurate simulation of castingprocesses.
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Simulation?????
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Advantages
Cost. Level of Detail.
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Inverse Heat transfer???
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Inverse Problem:
An Inverse Problem is one of determiningunknown causes on the basis of observedeffects
Contrast with a Direct Problem of compusystem responses based on specified inputs
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Lets us consider a simple heattransfer problem.
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Direct Problem Determination of the temperature distribution T(x, t
in the interior region of the solid, as a function oftime and position.
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Inverse Problem:
Consider a problem similar to that, but theboundary condition function f ( t ) at thesurface x = 0 is unknown, while all the otherquantities appearing in equations, such as
F(x), k, p and cp, are known. We then wish to determine the unknown
boundary condition f(t).
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Inverse Problem(contd.)
To compensate for lack of information we wilmeasure temperature at a internal point atdifferent times.
We will try toestimate
the surface conditibased on this data.
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Class of Inverse Problem.
Inverse Boundary Problem Determine unknown action at a physical
boundary; typically a function of time Inverse Coefficient Problem
Determine unknown coefficients, such asthermophysical properties
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Interfacial Heat transfer coefficient
The coefficient that describes Heat transfer atinterface.
For castings this interface properties willbe dynamic.
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Difficulties in direct Estimation of Heattransfer coefficient in casting: Contacting pressure Surface oxides Roughness of surfaces Coating material. Gap formation by deformation of casting and
mold.
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Experimental Setup:
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Mathematical Model:Governing Equation for FEM solver:
Boundary conditions:
Interfacial Heat transfer coeffi
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Inverse Problem Algorith
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Results:
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Questions
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THANK YOU