Evaluating the optimum electric power consumption for forced convection of an EHD induced circulating flow through a circular tube: A numerical study

In this study, the effect of using EHD forced convection heat transfer through a circular tube is numerically investigated to prepare the required data sets to find the optimum configuration considering the Nusselt number and friction factor. To gain the required results, the Reynolds numbers and the applied voltages are set to 3000–7000 and 9–13.5 kV, respectively. Moreover, the variety of using miscellaneous placement positions of the central wire emitter, up to 30%, in combination with collector section angles in the range of θ = 90°–360°, are simultaneously investigated. The results of different section angles show that the Nusselt number has increased between 2.35 and 4.76 times compared to the non-EHD mode. Similarly, for the various eccentricities, the Nusselt number has increased between 2.35 and 5.05 times. In the final step, upon the gathered data, a Pareto front of optimal points was deduced for the hydraulic-thermal performances against the power consumption, and the optimum design was highlighted.