Influence of Arrangement for Elements of Bed to Flow and Heat Transfer

Abstract

The article presents numerical simulations of the flow and heat transfer for beds with an ordered and shifted arrangement of elements. The numerical model applied is based on the unsteady equation of heat conduction (3D) and the Navier–Stokes equations. A high-order compact method in combination with the weighted essentially non-oscillatory scheme and predictor–corrector method is applied for the spatio-temporal discretisation. The flows of air and heat in the bed are modelled using the immersed boundary technique, which allows the use of Cartesian meshes for objects with very complex geometric shapes. The influence of the shift of elements in the bed on the temperature and velocity field was analysed. For two of the selected beds, the influence of arrangements of elements on the flow and heat exchange was analysed, which can lead, for example, to an improvement in the heating properties and to eliminating defects in the construction of reactor fillings.