In today's modern world, where everything has to be efficient and cost-productive, vortex production in fluid flow can increase heat transfer, resulting in improved mixing of fluids at different temperatures. It helps to increase the properties of the fluid to ideal properties. Parallel-plate channel convective heat transfer has various applications in portable heat exchangers, such as plate heat exchangers. In this research paper, the structure of vortices induced by the spiral coil insert in a parallel plate channel is examined and the effects of vortices on velocity and temperature fields for heat transfer enrichment are analyzed. The flow through a parallel plate channel is considered laminar, steady, and incompressible. Initially, the parallel plate channel with a spiral coil insert is examined using water as base fluid, and then its study is extended with the nanofluids to identify the combined effect of spiral coil insert and nanofluids. The spiral coil-induced swirl flows are evaluated using the RNG k-epsilon turbulence model. Three-dimensional numerical analyses were performed to solve the fluid flow governing equations using the finite volume method with a second-order upwind discretization scheme. The numerical results are analyzed with different heat transfer characteristics, and a comparison has been made to assess the effect of spiral coil inserts and nanofluids. From the comparison of numerical results, it is identified that the combined effect has recorded a better heat transfer rate due to the combined effect of spiral coil vortices (swirl flows) and nanofluid's desirable fluid properties.
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