Fin spacing is chosen to maximize heat transmission rate. Maximization is attained as a compromise between two opposite trends: fin surface maximization and adduction coefficient maximization. In this paper a new relation for the optimum spacing between rectangular fins is proposed. The relation was obtained keeping into account non-unitary fin efficiency. Demonstration is achieved by a theoretical approach which regards only rectangular fins. Results were verified also by numerical simulations. An original method to evaluate radiative heat flux is proposed too. The method allows to obtain an original simple radiative heat flux equation. Numerical simulations and theoretical evaluations show that the proposed convective flux optimization method and the model for radiative flux estimation are respectively suitable for high length and high temperature rectangular fins.
Rectangular fin: Spacing Optimization and New Radiative Flux Evaluation Method
COTANA, Franco;ROSSI, Federico;FILIPPONI, MIRKO
2005
Abstract
Fin spacing is chosen to maximize heat transmission rate. Maximization is attained as a compromise between two opposite trends: fin surface maximization and adduction coefficient maximization. In this paper a new relation for the optimum spacing between rectangular fins is proposed. The relation was obtained keeping into account non-unitary fin efficiency. Demonstration is achieved by a theoretical approach which regards only rectangular fins. Results were verified also by numerical simulations. An original method to evaluate radiative heat flux is proposed too. The method allows to obtain an original simple radiative heat flux equation. Numerical simulations and theoretical evaluations show that the proposed convective flux optimization method and the model for radiative flux estimation are respectively suitable for high length and high temperature rectangular fins.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
