Numerical Estimation of Mixed Convection Heat Transfer of Nannofluids Flowing In Horizontal and an Inclined Concentric Annuli. J. eng. sustain. dev. 2013;17(6):44-66. تاريخ الوصول مايو 19, 2024. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1024