Imbert-González, J., García-Valladares, O. and Guillen-Gordín, R. 2016. Influence of Inserting Cylindrical Helices on the Critical Reynolds number of a flow in an annular space. Chemical Technology. 36, 2 (Apr. 2016), 183-197. DOI:https://doi.org/10.1590/2224-6185.2016.2.%x.