Study the Effect of Granules Type of The Porous Medium on The Heat Transfer Enhancement for Double Pipe Heat Exchanger. Tikrit Journal of Engineering Sciences, [S. l.], v. 26, n. 4, p. 43–49, 2019. DOI: 10.25130/tjes.26.4.07. Disponível em: https://tj-es.com/ojs/index.php/tjes/article/view/133.. Acesso em: 10 sep. 2026.