Efecto de estructuras turbulentas no estacionarias sobre la térmica de flujos en conductos de sección cuadrada con un flujo de calor no simétrico

Abstract

From large eddy simulations of heated square ducts, we study the effect of non-stationary structures over the flow thermal behavior. Indeed the net decrease of the turbulent intensity over the heated wall, the velocity temperature correlation intensity is enhanced. This correlation which represents the turbulent heat transfer is fed by turbulent structures of high intensity, but with a low frequency. These turbulent structures create high amplitude temperature fluctuations. A conditional statistical study is performed for isolating these turbulent structures and knowing its local and global effects over the flow.