Parameters Optimization of Porous Media for Tbm

Abstract

Abstract: The porous media approach is considered as a proper method to be used in calculating the dynamics and heat transfer in packed ped of fusion reactors. In order to determine the parameters (permeability α and inertial loss coefficient C) of the porous media appropriately, two methods are proposed, which are the correction method and the fitting method. In this paper, the single channel model with sequentially packed pebbles is built to analyze the effect of scale of the pebble bed region on the pressure drop gradient, and to provide data, pressure drop gradient against superficial velocity, for optimization. Two methods, the correction method and fitting method, are considered to optimize the permeability and inertial loss coefficient, and the results are assessed with comparisons. It could be concluded that the correction method and fitting method are both feasible for optimizations, besides the parameters are regarded related to the superficial velocity and absolute in these methods respectively. The results in both the methods match well with the single channel simulation, and the overall pressure drops in the holistic model are similar with a relative error of 3.9%. The methods would be assessed with the data obtained from experiments in the future.

Keywords: Key words: porous media, correction method, fitting method, sequentially packed pebble bed, CFD, helium cooled TBM