REPORT NO. 676 SURFACE HEAT-TRANSFER COEFFICIENTS OF FINNED CYLINDERS

An irmestigaticm to determine and correlate ihe experi-mental mmface heai-transjer coefitienis of jinned cylindtv8 with different air-stream cooling arrangements was con-ducted at the Langley Memorial Aeronautical Laboratory from 1982 to 19278. l % %edigafion covered the. de-termination of the e$ed of jin width, jin space, jin thick-ne8.s, and cylinder diameter on the heat transfer. Whd-tunnel test8 were made in the free air 8h’eam m“th and without ba~ti and also with txLrt”ou8demke8 for creating a tuTiMent ah 8tream. Test8 were also made with blower coding. A wriation of the initial turbulence of the tunnel air 8tream wa8 found to huce little effect on the heat transfer. Correlation of the surface heat-transfer coe~ent8 w found po88ible by plotting a factor involrnng the hmt-tran8fer coe~ent8, the fin *pace, and the conductivity of the cooling air aga&t a factor involving the selaei@, the. denmly, and the vi8c08i @ of the cooling air and the $n 8pace, the fin width, and the cylinder diameter