Book excerpt: The 55th volume of "International Journal of Engineering Research in Africa" is compiled from the peer-reviewed manuscripts that present the research results in applied and fluid flow mechanics, computational analysis of heat and mass transfer processes, and investigation of the chaotic systems. This volume also considered the conceptual model for mitigating security vulnerabilities in smart grid electric energy distribution systems. The last research results in materials science and materials processing technologies, anti-corrosive coating, biodiesel synthesis, wastewater treatment technologies, and waste recycling are presented.