This book presents the select proceedings of 21st ISME conference on Advances in Mechanical Engineering. It covers the latest research and technological advancements in the area of thermal engineering. Various topics covered in this book are multi-phase flow, alternative fuels, fluid mechanics, combustion and IC engines, fluid machinery, heat and mass transfer, refrigeration and air-conditioning, renewable sources of energy, thermal systems simulation, heat exchangers, flow measurements, etc. The book is useful for researchers and professionals working in thermal engineering and allied fields.