Papers by Hector Ivan Velasquez Arredondo
The complex fluid-dynamic inside curved pipe heat exchangers gives them important advantages over... more The complex fluid-dynamic inside curved pipe heat exchangers gives them important advantages over the performance of straight tubes in terms of area/volume ratio and enhancing of heat transfer and mass transfer coefficient. In this is work, heat transfer in a non-previously implemented coneshaped helical prototype with 15cm in maximum diameter, 7.5cm in minimum diameter, 3/8" pitch and 40cm in axial length was studied. An empirical correlation for the determination of average Nusselt number along the duct, with Reynolds ranging between 4300 and 18600 has been developed. The experimental results have been compared with those obtained with the correlation proposed by Seban-McLaughlin and Xin-Ebadian for curved pipes. Also, numerical simulations were performed using ANSYS FLUENT 12.1 software, where the governing equations of mass, momentum and heat transport were solved simultaneously, using realizable k-e two equations turbulence model. The velocity profiles in cross sectional area were obtained and compared with those of conventional helical tube configurations (non-conical). It was found there are similarities in terms of the main flow skewness, but there were slight differences on the path that follows the fluid particles in the secondary flow. Finally, the results for pressure gradient were calculated using Ito and White correlations and were compared with those obtained in computer simulations, obtaining a good agreement.
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Papers by Hector Ivan Velasquez Arredondo