Seismic Analysis of Multi-Storeyed Building with Underneath Satellite Bus Stop and Intermediate Service Soft Storey Having Floating Columns by Time History Analysis

In order to increase the efficiency and the specific power of gas turbine engines, the turbine inlet temperature study is very important. The current rotor inlet temperature level in advanced Gas turbine is far above the melting point of the blade material. Therefore along with high temperature material development a sophisticated cooling scheme must be developed. Nevertheless, material progresses are not sufficiently important to guarantee an economically acceptable life span of the components, in contact with the hot gases. So recently research is focused on turbine blade cooling. The blades are cooled in different ways such as using cooling holes, ribs, grooves, dimples, and many more. Dimples are the depression created on a surface which generate extra strong vortex flows near the wall beneath the main flow region downstream the dimples, which distinctively increases the turbulent mixing there and enhance the heat transfer rates. In the present study, the effects on heat transfer due to dimples are studied by creating five dimples in a rectangular channel. The work is carried out for different dimple depths (δ/D=0.23 to 0.26) and at different Reynolds number varying from 7500 to 27500. The computational study is carried out using NUMECA FINE/Open commercial code using k-ε (Extended wall function) turbulence model. Results show that at higher Reynolds number the Nusselt number increases as the dimple depth is increased and at lower Reynolds number (i.e. lesser than 22500) the Nusselt number varies non-uniformly. The dimple depth to diameter ratio δ/D =0.25 gives the best results as the Nusselt number is high at all Reynolds numbers compared to other dimple depths.