STUDY THE EFFECT OF METALLIC PARTICLE ON DIFFERENT SPACER IN A CO-AXIAL DUCT AT DIFFERENT PLACES. International Journal of Advance Engineering and Research Development (IJAERD), [S. l.], v. 6, n. 9, p. 90–96, 2019. Disponível em: https://www.ijaerd.org/index.php/IJAERD/article/view/4409. Acesso em: 9 sep. 2025.