Disk and doughnut baffles configuration for shell tube heat exchangers (STHXs) is one of the solutions for compensating the higher pressure drop penalty induced by conventional segmental baffles. Furthermore, absently reliable references for the optimum design of this type of STHXs are our main purpose to carry out this investigation. From modeling numerical simulation results, with 7 baffles and 70% baffles ratio geometrical dimension is suggested the optimum configuration of this type of heat exchange. Additionally, the characteristic of heat transfer performance is discussed by varying the flow velocity in all different flow regimes of shell and tube side respectively through conducting the experimental apparatus. Hopefully this result could provide validating information in optimum design of STHXs with disk and doughnut baffles.