Dr. Debi Prasad Mishra, formerly a professor in the Department of Aerospace Engineering and Design Program, Indian Institute of Technology Kanpur (IITK), Kanpur, India, is currently working as the Director of National Institute of Technical Teachers Training and Research (NITTTR), Kolkata. His major areas of research interests are propulsion, combustion, and atomization. He had held Indian Oil Golden Jubilee Professional Chair in IIT Kanpur. He has been conferred with several awards and recognitions. He has authored 5 textbooks and 6 edited books in the field of combustion and propulsion. He has published more than 234 research papers in international/national journals and six patents to his credit. He has undertaken several research and consultancy projects from various agencies, research labs and industries. He has developed 6 online courses under Swayam Platform, a national initiative of MHRD.Dr. Ashok Kumar Dewangan is an Assistant Professor in the Department of Mechanical Engineering, National Institute of Technology, Delhi, India. He received his undergraduate degree from National Institute of Technology, Raipur, Chhattisgarh; postgraduate degree from Indian Institute of Technology Kharagpur, West Bengal, and Ph.D. from Indian Institute of Technology Roorkee, Uttarakhand. His areas of research are refrigeration and air- conditioning, cryogenics, two-phase flow & heat transfer, instrumentation and measurements. He has published 17 research papers in the reputed peer-reviewed international journals and conferences. Currently he is working in the areas of boiling and condensation of refrigerants, thermal modelling of selective laser melting and single/twin wire gas metal arc welding.Dr. Achhaibar Singh is a visiting faculty in the Department of Mechanical Engineering, Netaji Subhas University of Technology, New Delhi, India. He obtained graduate degree in engineering from Madan Mohan Malviya University of Technology Gorakhpur; postgraduate degree from Indian Institute of Technology Bombay, and Ph.D. from Indian Institute of Technology Bombay. He has worked 18 years in industry as engineering manager and R&D head. His areas of research are refrigeration and air- conditioning, rotating flows in turbo machines, and computational fluid dynamics. He has published 7 research papers in the reputed peer-reviewed international journals and several papers in conferences. Currently, he is working in the areas of flow in rotor stator system and CFD of rotating flow using finite element method.