Read more
Convective heat transfer was experimentally investigated in tubes with helical coils inserts in turbulent flow regime within Reynolds number range of 14400 Re 42900. The present work aims to extend the experimental data available on wire coil inserts to cover wire diameter ratio from 0.044 to 0.133 and coil pitch ratio from 1 to 5. Uniform heat flux was applied to the external surface of the tube . Air was selected as fluid. The effects of Reynolds number and wire diameter and coil pitch ratios on the Nusselt number and friction factor were studied. The enhancement efficiency and performance criteria ranges are of (46.9-82.6%) and (100.1-128%) within the investigated range of the different parameters, respectively. Correlations are obtained for the average Nusselt number and friction factor utilizing the present measurements within the investigated range of geometrical parameters and Re.
About the author
Mahmoud A. Sharafeldin had Master degree of Mechanical Engineering from Benha University, Egypt. Now, I am developing my thesis at Department of Energy, Faculty of Mechanical Engineering, Budapest University of Technology and economics, Hungary. My research work is focused on design of nanöuids incorporated in a heat transfer ¿uid for solar energy
