Considerations in the development of the enhanced, three dimensional 1EHT enhanced heat transfer surfaces include: maximization of heat transfer; minimization of operating costs; and/or a minimization of the rate of surface fouling.
Thermal performance concept includes maximization of heat transfer coefficient and minimization of friction factor.
The optimization analysis has been demonstrated for the maximization of heat transfer through an annular step porous fin (ASPF) under a design constraint of mass of a fin.
Moreover, it is also shown that it is the combination of a dispersive (diffusive) and a convective mechanism that allows for the maximization of nutrient transfer through use of the best of these mechanisms at a specific time.
Inverse problem solutions on the maximization of heat transfer rate are addressed, respectively regarding of thermal Rayleigh number, partitions location, partitions width, partitions total-length and thermal conductivity ratio.
Maximization of overall heat transfer coefficient and minimization of total pressure drop considered simultaneously as objective functions during multi-objective optimization.
The entropy generation minimization is related to the optimal value for the pressure drop through a thermodynamic system and the maximization of the heat transfer, as reported in Equation 5: N S = Ṡ ′ gen Ṡ ′ gen,min = 0. 8 5 6 R e D R e D,opt - 0. 8 + 0. 1 4 4 R e D R e D,opt 4. 8. (5).
As the present study is an analytic, it is extended to the analysis for determination of optimum dimensions of said fin by satisfying either the maximization of rate of heat transfer for a given fin volume or by the minimization of fin volume for a desired heat transfer rate.
Criteria include the maximization of the overall heat transfer coefficient; minimization of pumping power; and minimization of the rate of surface fouling.
By linking droplet return with droplet jumping (multi-hop), we develop a framework to predict macroscopic droplet motion along the tube, and offer guidelines for the minimization of drag force and maximization of overall condensation heat transfer.
