Generic plate and experiment-related high-fidelity models to study uncertainty propagation and transient processes for heat rejection problems are developed. The stochastic Biot numbers on the top and bottom surfaces of the plate, B i 1 and B i 2 , and stochastic dimensionless input parameters, describing initial and convection boundary conditions, are introduced to define temperature variation in the modeled systems. The resulting uncertainty amplitude demonstrates a varying time evolution across a wide range of mean values of the input parameters. Depending on which input parameters are stochastic, the uncertainty may increase or decrease over time, or remain small for a given time interval in the case of the plate model. For small B i 1 , 2 , dimensionless characteristic time for a temperature variation curve to approach its steady state is ( B i 1 + B i 2 ) 1 and large. An extremum in a temperature variation curve may appear when the Biot numbers are unequal and disappears if B i 1 = B i 2 . Results are nonsymmetric with respect to interchanging B i 1 and B i 2 . Despite the difference in shape, the temperature variation profile over a specific region in the experimental test section numerically described by the high-fidelity model is close to the corresponding results provided by the plate model for the same Biot numbers, convection boundary, and initial conditions.


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    Title :

    Modeling of Uncertainty Propagation for Transient Heat Rejection Problems


    Contributors:

    Published in:

    Publication date :

    2023-10-14


    Size :

    9 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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