ESTUDIO EXPERIMENTAL DE LA TRANSFERENCIA DE CALOR EN BANCOS DE TUBOS CON ARREGLO EN CUADRO

Abstract

The average heat transfer in in-line banks of tubes was studied in this work. The range of flow regime analyzed was characterized by Reynolds numbers between 1000 and 15000. In the investigated geometries the transversal pitch was constant, while the longitudinal pitch took the following values: b = 1.25, 1.50, 2.0, 2.50, and 3.0. A wind tunnel with a bell-shaped inlet was constructed and equipped with two flow conditioners in order to get a uniform flow in the experimental zone. It was designed a uniform and controlled electric heating system for the tubes. Tube-surface temperatures were measured at the first and last files of the banks. Air was used as the cooling fluid. The bank’s inlet temperature, the bank’s outlet temperature field, and the mass flow rate allowed the computation of the mean heat transfer coefficient. After generalizing the data, it was demonstrated the hyperbolic-tangent dependence of the exponent m1 and constant C in function of the relative pitch b in in-line tube banks. Maximum and minimum values were 0.751 and 0.606 for m1, and 0.324 and 0.068 for C. Thus, Δm1 = 0.145.