Dr. Arun Kumar Tiwari is as a Professor at the Mechanical Engineering Department, Institute of Engineering & Technology, Dr. A.P.J. Abdul Kalam Technical University, India. Dr. Tiwari completed his PhD in mechanical engineering from the Indian Institute of Technology and M. Tech in mechanical engineering from Indian Institute of Technology. His research interests include solar thermal energy, nanofluidics (characterization, application, and thermophysical & optical properties) and heat exchangers. He has published numerous articles on reputable journlas, such as Physics Report, Renewable and Sustainable Energy Reviews, Energy Conversion and Management and more.