  In heat transfer augmenting methods such as radial fins, the heat transfer
enhancement commonly leads to the drag force increment. In the present paper,
slots are inserted over the fins to simultaneously reduce the drag coefficient.
Turbulent convection heat transfer around a cylinder, as well as oscillating
bundle of tubes including the slotted radial fins have been investigated. The
governing equations are solved in two-dimension utilizing OpenFOAM software
based on k-{\omega} SST closure model. The cases with various slot location,
slot width, the number of the slots, the fin height, and oscillation
frequencies are examined. In all cases, the Reynolds number is taken to be
equal to 5000. Presence of three slots on the fins reduces the drag coefficient
by 23% and augments the Nusselt number by 76%. In order to enhance the heat
transfer from the bundle of tube, oscillation of tubes and utilization of the
slotted fins are applied. The optimum situation occurs for a sample with the
oscillating third column that shows 3% increment in heat transfer relative to
that of the fixed case. This is while adding the slotted fins to the
oscillating tube bank increases the heat transfer up to 2.5 times.
