PASSIVE HEAT TRANSFER ENHANCEMENT TECHNIQUES IN FLAT-PLATE SOLAR COLLECTORS: A COMPREHENSIVE . THE IRAQI JOURNAL FOR MECHANICAL AND MATERIALS ENGINEERING, [S. l.], v. 25, n. 1, p. 98–130, 2026. DOI: 10.32852/m1n4v907. Disponível em: https://www.iqjfmme.com/index.php/jmme/article/view/851.. Acesso em: 15 apr. 2026.