Evaluation of the effect of an asymmetric electric field on the electrohydrodynamic enhanced forced convection in a double-wall-heated channel by Q criterion
Independent Researcher, Rasht, Iran
Accepted: 22 July 2021
Published online: 30 July 2021
An investigation of the effect of an asymmetric electric field on the enhancement of heat transfer and the electrohydrodynamic (EHD)-induced flow strength in a double-wall-heated channel is numerically studied by the Q criterion. A set of case studies are carried out for a double-wall-heated channel model to analyze the influence of the key contributing EHD parameters; Reynolds number and the configuration of wires, on the Q criterion and the heat transfer characteristics as well. A descriptive factor of enhancement: the ratio of the mean Nusselt number resulted from electrohydrodynamic to the mean Nusselt number without electrohydrodynamic, is implemented to estimate the heat transfer enhancement capability. It is shown that the enhancement of heat transfer is sensitive to the wire configuration. Also, the results show that the heat transfer augmentation is more affected by the asymmetric electric field and the intensity of the Q criterion in the recirculation zones in the vicinity of wires than the symmetric electric field. Furthermore, the results indicate that the enhancement factor grows at lower Reynolds numbers. It has been seen that setting wire 1 closer to the walls results in better heat transfer enhancement.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2021