This paper presents the experimental results on heat transfer characteristics of air forced convection over not-thin plates with transverse and skewed ribs; data are obtained by means of infrared thermography. Compari¬sons of heat transfer distributions for ribbed plates with data over a flat plate suggest the following observations. The periodic development of the boundary layer is very well displayed by the local distribution of the convective heat transfer coefficient; for both enhanced surfaces, the average Nusselt number shows the same dependence on the Reynolds number than the flat plate; the en¬hancement factor is about 1.4 for both ribbed configura¬tion, without appreciable differences between them.
Heat transfer measurements by IR thermography over enhanced surfaces with skewed ribs
NIRO, ALFONSO
2009-01-01
Abstract
This paper presents the experimental results on heat transfer characteristics of air forced convection over not-thin plates with transverse and skewed ribs; data are obtained by means of infrared thermography. Compari¬sons of heat transfer distributions for ribbed plates with data over a flat plate suggest the following observations. The periodic development of the boundary layer is very well displayed by the local distribution of the convective heat transfer coefficient; for both enhanced surfaces, the average Nusselt number shows the same dependence on the Reynolds number than the flat plate; the en¬hancement factor is about 1.4 for both ribbed configura¬tion, without appreciable differences between them.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.