The 6th International Conference of Fluid Flow, Heat and Mass Transfer (FFHMT'19) aims to become the leading annual conference in fields related to fluid flow and heat transfer. The goal of is to gather scholars from all over the world to present advances in the fields of transport phenomena 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. FFHMT is an acronym for Fluid Flow, Heat and Mass Transfer