No abstract

No abstract

No abstract

No abstract

The density of heat transfer rate from a vertical array of flat tubes in cross flow is maximized under fixed pressure drop using constructal design. With the constructal design, the

No abstract

The present work examined numerically for the first time, the magneto-hydrodynamics (MHD) natural convection flow and heat transfer in a fully opened parallelogrammic enclosure filled with copper-water nanofluid and subjected to a straight magnetic field. Both the upper and lower inclined walls of the enclosure are kept cold, while its right sidewall is considered fully opened to the environment. The left sidewall of the enclosure is heated partially, while the remaining parts of it are considered thermally insulated. The ranges of this study are, Hartmann number (0  Ha  75), nondimensional heat source location (0.25    0.75), Rayleigh number (10 4  Ra  10 6), solid volume fraction (=0.04), and the inclination angle of the upper and the lower walls (-60°    60°). The non-dimensional heat source length is considered fixed at [ = 0.25]. For all Hartmann numbers, It was found that for [Ra =10 6 ] , the maximum

A 3-dimensional numerical analysis is performed to study the thermal performance in three new designs of the corrugated plate-fin subjected to impinging airflow for Reynolds number range from 1600 to 7700. The three designs of pate-fin heat sink include a triangular (TRI-PFHS), a rectangular (REC-PFHS), and a semi-circular (SCR-PFHS). A comparative evaluation has been performed on the thermal performance of the suggested designs with the traditional type (T-PFHS). The results revealed that the thermal performance of new designs is higher than that of the traditional heat sink. The new designs of corrugated plate-fin heat sink have proved the ability to improve heat transfer due to the larger area offered by corrugation and high flow disruptions caused by the presence of a semi-confined channel. The performance of the new designs is assessed in terms of Nusselt number, pressure drop, and performance factor. The overall performance factor (Pf) for SCR-PFHS is predominant over all other designs which achieved a highest value of 1.76 at Re=7700.