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RISModeling Effective Thermal Conductivity of Thermal Radiation for Nuclear Packed Pebble Beds
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In nuclear packed pebble beds, it is a fundamental task to model effective thermal conductivity (ETC) of thermal radiation. Based on the effective heat transfer cells of structured packing, a short-range radiation model ...
Particle-Scale Investigation of Thermal Radiation in Nuclear Packed Pebble Beds
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: For the heat transfer of pebble or granular beds (e.g., high temperature gas-cooled reactors (HTGR)), the particle thermal radiation is an important part. Using the subcell radiation model (SCM), which is a generic theoretical ...
A New Uniform Continuum Modeling of Conductive and Radiative Heat Transfer in Nuclear Pebble Bed
Publisher: American Society of Mechanical Engineers (ASME)
Abstract: Radiative and conductive heat transfer is fairly important in the nuclear pebble bed. A continuum model is proposed here to derive the effective thermal conductivity (ETC) of pebble bed. It is a physics-based equation ...
Analysis of Clumped-Pebble Shape on Thermal Radiation and Conduction in Nuclear Beds by Subcell Radiation Model
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The core of high-temperature gas-cooled reactor is a dense pebble bed of random packing filled with monosized fuel spheres. Subcell radiation model (SCM) is a generic analytical approach to calculate effective thermal ...
Comparative Study on the Numerical Methods for View Factor Computation for Packed Pebble Beds: Back Propagation Neural Network Methods Versus Monte Carlo Methods
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: It's an unsolved problem to calculate the thermal radiation view factors among fuel pebbles as accurately and quickly as possible in the simulation of the temperature fields within the pebble-bed. In this study, a series ...
Method and Validation for Measurement of Effective Thermal Diffusivity and Conductivity of Pebble Bed in High Temperature Gas-Cooled Reactors
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The effective thermal diffusivity and conductivity of pebble bed in the high temperature gas-cooled reactor (HTGR) are two vital parameters to determine the operating temperature and power in varisized reactors with the ...