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Present numerical investigation studies the influence of inserting rods with helical fins in a shell and tube heat exchanger (ShT-HEX) under magnetic field (MF) and filled with two-phase nanofluid (NF) on the thermal–hydraulic performance (THP). The goal of the present article is to study the influence of different geometrical factors of fins, different Re, various MFs and also different nanoparticles concentrations on the THP of Newtonian NF flow under MF in a novel HEX using the finite volume method. Also, an economic analysis is done with the interesting parameter heat flux to reduce the weight of the HEX. It was found that the novel configuration with b = 100 mm and a = 23 mm filled with MgO-SAE10 NF at φ = 1.500% under the MF of B = 0.5 T has the optimum characteristics with the q" = 98.08 W/m2 and 143.60 W/m2 at Re = 8,000 and 20,000, respectively. Based on obtained results, the costs of manufacturing of novel model can be 88% of the basic model. Therefore, the economic enhancement is done in this investigation using ANSYS-Fluent and SolidWorks software. [ABSTRACT FROM AUTHOR]

In this study, the effects of adding CuO nanoparticles (NPs) on natural convection heat transfer within an enclosure by considering Brownian motions and thermophoresis were discussed. For this purpose, copper oxide NPs were inserted to water at 1, 3, and 5 vol.%. Using two‐phase model, at constant Grashof (104) and Richardson numbers (102), the enclosure angularity efficacy on the heat transfer was examined at 30°, 45°, and 60°. Adding NPs has one positive effect (thermal conductivity enhancement) and one negative point (viscosity augmentation). It was found that up to 1 vol.%, the addition of NPs improves (due to the superiority of the positive effect on the negative effect) the thermal conductivity but upon 1%, the negative effect is preferred to the positive effect, and hence heat transfer is diminished. At Ri = 100, only adding 1% of the NPs enhanced the Nusselt number (Nu) and adding more NPs diminished the Nu. The angle of the enclosure affects the concentration distribution of the NPs and diminishes eases the NP homogeneity as well. As the enclosure angle augmented from 30° to 60°, the Nu improved by 47%. Note that at the best conditions, adding NPs improved the Nu up to 2%. [ABSTRACT FROM AUTHOR]