TY - JOUR
TI - Heat transfer in a channel with inclined target surface cooled by single array of centered impinging jets 
AU - Al Mubarak Ali A
AU - Shaahid Syed M
AU - Al-Hadhrami Luai M
JN - Thermal Science
PY - 2013
VL - 17
IS - 4
SP - 1195
EP - 1206
PT - Article
AB - An experimental investigation has been carried out to study the heat transfer  characteristics in a channel with heated target plate inclined at an angle  cooled by single array of equally spaced centered impinging jets for three  different jet Reynolds numbers (Re=9300, 14400 and 18800). Air ejected from  an array of orifices impinges on the heated target surface The target plate  forms the leading edge of a gas turbine blade cooled by jet impingement  technique. The work includes the effect of jet Reynolds numbers and feed  channel aspect ratios (H/d = 5, 7, 9 where H=2.5, 3.5, 4.5 cm and d=0.5 cm)  on the heat transfer characteristics for a given orifice jet plate  configuration with equally spaced centered holes with outflow exiting in both  directions (with inclined heated target surface). In general, It has been  observed that, H/d=9 gives the maximum heat transfer over the entire length  of the target surface as compared to all feed channel aspect ratios. H/d=9  gives 3% more heat transfer from the target surface as compared to H/d=5 (for  Re=14400). Also, it has been observed that the magnitude of the averaged  local Nusselt number increases with an increase in the jet Reynolds number  for all the feed channel aspect ratios studied.