This book provides a vehicle for the exchange and dissemination of original research results, technical notes, and state-of-the-art reviews pertaining to thermal and fluid transport phenomena at microscales and nanoscales. It covers a wide range of topics on fundamentals and applications of microscale and nanoscale transfer processes of mass, momentum, and energy such as microscale and nanoscale heat transfer and fluid flow, nanofluid heat transfer and flow, microfluidics, nanofluidics, and technologies based on these transport processes such as various microscale and nanoscale thermal and fluid devices.