Ayad A. Abdalla and  Elhadi I. Elhadi and  Hisham A. Elfergani,  Numerical Investigation of Developing Mixed Convection in Isothermal Circular and Annular Sector Ducts.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2021, vol. 171(3). 158 - 170
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/10011918.