Abstract
Corrugating channel wall is considered to be an efficient procedure for achieving improved heat transfer. Further enhancement can be obtained through the utilization of nanofluids and porous media with high thermal conductivity. This paper presents the effect of geometrical parameters for the determination of an appropriate configuration. Furthermore, the optimization of forced convective heat transfer and fluid/nanofluid flow through a sinusoidal wavy-channel inside a porous medium is performed through the optimization of entropy generation. The fluid flow in porous media is considered to be laminar and Darcy–Brinkman–Forchheimer model has been utilized. The obtained results were compared with the corresponding numerical data in order to ensure the accuracy and reliability of the numerical procedure. As a result, increasing the Darcy number leads to the increased portion of thermal entropy generation as well as the decreased portion of frictional entropy generation in all configurations. Moreover, configuration with wavelength of 10 mm, amplitude of 0.5 mm and phase shift of 60° was selected as an optimum geometry for further investigations on the addition of nanoparticles. Additionally, increasing trend of average Nusselt number and friction factor, besides the decreasing trend of performance evaluation criteria (PEC) index, were inferred by increasing the volume fraction of the nanofluid (Al2O3 and CuO).
Highlights
Achieving improved heat transfer in tubes and channels are of great significance, especially in industrial and technological applications from the energy saving viewpoint
Sgen,T and Sgen,f represent the entropy generation induced by heat transfer and fluid friction, respectively
Generations as a result of increased Darcy number, respectively. These figures provide the Similar to the previous cases, according to Figure 18, the performance evaluation criteria (PEC) was determined for various phase profile of frictional entropy generation, which declares the higher contribution of frictional entropy shifts, a = 0.5 mm and = 10 mm
Summary
Achieving improved heat transfer in tubes and channels are of great significance, especially in industrial and technological applications from the energy saving viewpoint. The simultaneous application of nanofluid and porous medium in throttle area of the sinusoidal channel was explored by Nazari and Toghraie [32] They utilized local thermal equilibrium model for the evaluation of fluid flow and heat transfer in the desired system. Performed the numerical investigation of the flow characteristics, heat transfer, and entropy generation in the annular pipe that were filled fully or partially with the porous media and nanofluid flow [63] They utilized two-phase mixture model for the investigations and declared the dependency of the performance and entropy generation to the configuration parameters, nanoparticles concentration, and Reynolds number. In the current study, it is aimed to conduct a numerical investigation to evaluate the heat transfer, nanofluid flow, and entropy generation in a sinusoidal-wavy minichannel with porous medium. The impact of adding nanofluids (Al2 O3 and CuO) to the pure fluid and volume fraction is performed
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