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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

EXPERIMENTAL INVESTIGATION OF HEAT TRANSFER ENHANCEMENT ON THE ENDWALL AROUND AN OBSTACLE EMBEDDED WITH A VORTEX GENERATOR PAIR

Get access (open in a dialog) DOI: 10.1615/IHTC16.hte.022151
pages 4971-4978

要約

Heat transfer enhancement on the endwall around an obstacle embedded with a pair of vortex generators is investigated. Obstacles with cylindrical and square cross sections are experimentally examined and compared with and without vortex generators. The vortex generators employed is a pair of longitudinal winglet vortex generator. Local Nusselt numbers are calculated for both types of obstacles in presence of vortex generator experimentally whereas, flow features are captured numerically using ANSYS-FLUENT 17.0. A high heat transfer region upstream of the obstacle has increased its width with the installation of vortex generators for both shapes of the obstacle. However, only a small increase in magnitude occurs. Comparison of local Nusselt numbers shows that for the case of the cylindrical obstacle, there is more heat transfer at the center of the obstacle whereas, for the obstacle with square cross section, more heat transfer is observed at the upstream corners of the obstacle both with and without vortex generators. It is also evident from the findings of the results that installation of vortex generators upstream of an obstacle enhances the endwall heat transfer more in the spanwise direction than the streamwise direction. In addition, flow characteristics obtained from the numerical simulations show that presence of a vortex generator pair reinforces the strength of the horseshoe vortex and as a result additional heat transfer enhancement. Thermal performance for both types of obstacles in presence of vortex generators are calculated and compared at various Reynolds number.