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    Experimental investigation of the effects of orientation angle on heat transfer performance of pin-finned surfaces in natural convection
    (PERGAMON-ELSEVIER SCIENCE LTD, 2011) Sertkaya, Ahmet Ali; Bilir, Sefik; Kargici, Suna
    Natural convection heat transfer in air from a pin-finned surface is investigated experimentally by considering the effect of radiation heat transfer. The plate was oriented as the pin arrays facing either downwards or upwards from vertical axis with different angles and the experiments were performed for different values of heater power input. From the results of the experiments it is observed that the pin fins increase the heat transfer considerably when compared to the unpinned surface. The upfacing pins are more enhancing heat transfer than the downfacing pins and the enhancement is decreasing with increasing orientation angle from the vertical axis. (C) 2011 Elsevier Ltd. All rights reserved.