A fundamental study of the heat transfer and flow situation around spacers (a single row of several cylindrical rods in cross flow)

This paper describes the characteristics of heat transfer and flow around several spaces (a single row of several cylindrical rods) in cross flow on a heated surface in a parallel plate duct. Temperature distributions are obtained by using a thermosensitive liquid crystal film and a narrow band optical filter method that does not require human color perception. Apparent local Nusselt numbers between two cylindrical rods are expressed as a function of Reynolds number, local position and pitch of the cylindrical rods. The pitch and Reynolds number affect the wake flow patterns which are classified into three domains. (author)