Now showing items 1-10 of 37
A review of methods to predict the effective thermal conductivity of packed pebble beds, with emphasis on the near-wall region
The effective thermal conductivity is an important parameter that is representative of the overall heat transfer in a packed bed of spheres. It includes the effects of conduction through the solid material and contact areas ...
Modeling the flow and heat transfer in a packed bed high temperature gas-cooled reactor in the context of a systems CFD approach
ABSTRACT Engineers are faced with two major challenges when carrying out the thermal-fluid design of a complex system consisting of many interacting components. The first challenge is to predict the performance of all the ...
Multi–Sphere Unit Cell model to calculate the effective thermal conductivity in packed pebble beds of mono–sized spheres
This paper presents a new approach to the calculation of the effective thermal conductivity in packed pebble bed reactors, namely the Multi-sphere Unit Cell model. The model specifically accounts for the porous structure, ...
A system CFD model of the heat transfer in a prismatic block of a VHTR
The conduction heat transfer through the prismatic blocks containing the fuel elements in a Very High Temperature Reactor (VHTR) is of crucial importance for the proper operation of the reactor under normal operating ...
Modelling of convection heat transfer in the SNU Riser Heat transfer Experimental Facility (RHEF)
The Reactor Cavity Cooling System (RCCS) of a High Temperature Gas-cooled Reactor (HGTR) plays an important role in ensuring the integrity of the HTGR during normal operating and accident conditions. The performance of ...
CFD analysis of thermal dispersion in a structured packed bed
Packed beds are generally modelled in a partial manner to avoid computational costs. This implies that only a small portion of the representative bed is modelled explicitly in CFD simulations, usually by assuming ...