Department of Mechanical and Industrial Engineering of Gadjah Mada University proudly present the 10th International Conferences on Thermofluids 2019. The 10th International Conference on Thermofluids seeks objectives of uniting together researcher, scientist, academics, policy makers, and professionals to exchange information and identity research needs in the areas of thermofluids engineering. In this annual conference, we strive to enhance the scope to a wider community of researcher allowing a higher quality and visibility of publications. The conference would also contribute to continuous development of the research and technology in thermofluids engineering for current and future energy and environmental sustainability.