This report describes a numerical simulation of a dry particle bed heat
transfer experiments performed in MOSES project. The goal of the simulation
was to validate the model of effective heat transfer coefficient developed and
applied in PASULA code.
The test facility was set up to measure temperatures in a vertically aligned,
cylindrical Al2O3-particle bed, which was heated electrically from the top.
Both axial and radial temperature profiles were measured in the particle bed
at four different temperature ranges produced by varying heating power.
Temperature profiles were also measured from the surrounding insulator
material, to facilitate the overall energy balance estimation.
Calculation model in the PASULA code is based on control volume method of
solving heat transfer equations in defined geometry. Material properties of
Al2O3 particles, insulator materials surrounding the test cylinder and used in
the resistance heater module, in the ceramic cylinder housing the particles
he steel shell surrounding the whole apparatus were given as polynomial
fittings. All measured data points were used to quantify the parameters in the
fitting polynomials. The solution of the coefficients was searched by
minimising the error between measured and calculated values over the whole
An excellent agreement was achieved with a well defined parameter set. When
comparing the obtained calculated material properties and heat transfer
coefficients with the sparse data points obtained from the manufacturer or
from the literature, the agreement was reasonably good. Thus it can be
concluded that the numerical model developed for particle bed effective heat
transfer coefficient in PASULA code is capable of predicting heat transfer
phenomena in a dry rubble bed with good accuracy, once the solid particle
material and cover gas properties are known.
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- heat conduction
- particle bed
- severe reactor accident