The 5th International Conference on Heat Transfer and Fluid Flow (HTFF'18) aims to become the leading annual conference in fields related to heat transfer and fluid flow. The goal of HTFF'18 is to gather scholars from all over the world to present advances in the relevant fields and to foster an environment conducive to exchanging ideas and information. This conference will also provide an ideal environment to develop new collaborations and meet experts on the fundamentals, applications, and products of the mentioned fields. All accepted and presented papers will be published in the conference proceedings, under an ISBN reference in a USB drive. The online version of the proceedings will also be published under an ISSN reference and each paper in the proceedings will be assigned unique DOIs by CrossRef. Furthermore, selected papers from the conference will be submitted for possible publication in the following journals from Avestia Publishing (publication fees may apply): Journal of Fluid Flow, Heat and Mass Transfer HTFF is an acronym for Heat Transfer and Fluid Flow. To view HTFF 2017 website, please visit www.2017.htffconference.com