MATHEMATICAL MODELLING OF NEWTONIAN FLUIDS FLOW PHENOMENA THROUGH DIFFERENT RATIOS OF BACKWARD STEP DUCT. Kashf Journal of Multidisciplinary Research, [S. l.], v. 3, n. 01, p. 65–104, 2025. DOI: 10.71146/kjmr818. Disponível em: https://www.kjmr.com.pk/kjmr/article/view/818. Acesso em: 14 may. 2026.