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Библиогр.: 57 назв.

Optimization of cooling systems for electronic devices is one of the serious challenges in the modern industrial and engineering world. In the current investigation, the significance of undulations on the thermogravitational heat transfer and entropy optimization within a wavy enclosure having local heater at the lower boundary has been analyzed numerically. Three different nanoparticles are used to investigate in this analysis within the base fluid (H2O), namely, Cu, Al2O3 and TiO2. Both vertical boundaries are kept at fixed cooled temperature Tc, whereas the horizontal flat walls keeping as adiabatic except for the heated section. The bottom source of heat is supposed to be isothermal with linearly changing temperature. The governing non-dimensional transformed equations are handled easily by finite volume method and the significant outcomes using isolines of temperature, stream function and local entropy, as well as mean Nusselt number and total entropy generation are discussed. The fixed and assorted parameters involving in this investigation represent Rayleigh number (Ra = 106), Prandtl number (Pr = 6.2), non-uniformity parameter (λ = 1) and various length of heated source (ε = 0.25, 0.50, 0.75), volume fraction of nanosuspension (ϕ = 0.0–0.04), number of undulations (N = 0–3). The computational outcomes reported that a growth of the undulations results to the reduction in global heat transfer performance and average entropy generation rate. An increment of the heated portion length makes a raise of the average entropy generation rate and decreases in the mean convective heat transfer strength. Thus, the reported outcome indicates that a lower value of partial heater (ε = 0.25) characterizes the optimal design for the system of energy transfer efficiency for real-world engineering problems. Also, the entropy generation technique will be a valuable contribution to this field of study.