Abstract
A finite element study is provided in this paper for the controlling of the flow and heat transfer fields by multiporous fins within U-shaped enclosures using a semi-implicit technique for the intermediate velocities. Three porous fins are located in the left, center, and right channels of the U-shaped domain, and a heated section with a changeable length is placed in the lower boundary of the irregular domain. The overall thermal conductivity is a combination of the thermal conductivity of the nanofluid, porous medium, and thermal dispersion. Both an electromagnetic force and a heat source/sink take place in the flow domain. The unsteadiness of dependent variables is treated using the characteristic-based split algorithm. The major outcomes revealed that various flow structures and thermal features are given as the length of the porous fins is changed. Also, an increase in the length of the heat source B causes all the fins to be placed over the heated section, hence there are three maximum values of Nu, at the higher values of B. Furthermore, the average Nusselt number is reduced by 36.5% as Ha is increased from 0 to 100.