Advanced Trends in Mechanical Engineering (Volume - 2), edited by Dr. Abhishek Saxena and Dr. Satish Geeri, presents five cutting-edge chapters addressing innovations in polymer science, thermal-fluid systems, and smart manufacturing. This volume explores the future potential of biodegradable polymers in industrial applications, advanced modeling of liquid drop evaporation and liquid film condensation, developments in smart manufacturing technologies, and the integration of advanced composite materials. Emphasizing sustainability, energy efficiency, and digital integration, the book blends theoretical analysis with real-world applications, offering a comprehensive resource for students, researchers, and mechanical engineers. Whether in the context of renewable materials, process optimization, or intelligent manufacturing systems, this volume provides timely insights into the evolving landscape of mechanical engineering.