Effects of jet-to-target spacing on primary and secondary peak heat transfer for an obliquely impinging jet

This paper presents an experimental investigation on the primary and secondary peak heat transfer characteristics of obliquely (45°) impinging jet a flat smooth target surface. Local convective coefficients have been calculated through transient liquid crystal thermography technique employing one-dimensional semi-infinite conduction model for The effects Reynolds number (Re) jet-to-target spacings (z/d) investigated where Re was varied from 9,000 to 18,000 z/d 2.5 6. measurements reveal several important features oblique impingement, e.g., location peaks with respect geometric center (GC), its dependence z/d, shape enhanced zone stagnation, separation, reattachment features. two-dimensional map is presented in normalized form Nu/Numax, Numax transfer. It has found that certain occurs at fixed distance range investigated, while varies Re. For smallest offset by one diameter GC uphill direction, whereas moderate = 4, occurred near GC. highest again vicinity GC, however, slight downhill side. spent flow (post first impingement) which also determined level strongly dependent upon impingement radial variation compared against 90° (orthogonal) 6 18,000. observed above two configurations were sharper 45° case when 90°, further direction higher levels 90°.