Convective heat transfer for power law fluids in packed and fluidised beds of spheres

摘要: Abstract The forced convection heat transfer characteristics for an incompressible and steady flow of power law liquids in fixed extended beds spherical particles has been studied numerically. sphere–sphere hydrodynamic interactions have accounted by using a simple cell model. Within the framework such model, momentum energy equations solved finite difference method to obtain velocity temperature fields. Extensive numerical estimates local average Nusselt numbers as functions physical, rheological kinematic variables presented discussed two commonly employed thermal boundary conditions. In broad terms, number fluids (both shear-thinning shear-thickening conditions) normalized with respect corresponding value Newtonian fluid shows weak additional dependence on behaviour index. is seen promote expected impedes fluidised beds. All all, present results encompass wide ranges conditions follows: Reynolds number: 1–500; Peclet bed voidage: 0.4–0.8 index: 0.5–1.8 thereby covering extremely types behaviours. paper concluded presenting detailed comparisons limited analytical and/or experimental available liquid–solid mass systems.