The 4thInternational Conference of Recent Trends in Environmental Science and Engineering (RTESE'20) aims to become the leading annual conference in fields related to Fluid Flow and Thermal Science. The goal of RTESE'20 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. RTESE'20 is an acronym for Recent Trends in Environmenta Science and Engineering.