TY - JOUR TI - From the Guest Editors, 2019, Supplement 3 AU - Yang Xiao-Jun AU - Liang Xin AU - Xue Yi JN - Thermal Science PY - 2019 VL - 23 IS - 13 SP - 0 EP - 0 PT - Article AB - The mathematical models for the heat and fluid flow based on the Newton-Leibniz calculus have been successfully developed to describe the transport processes of the heat and mass transfer in fluid, solid and gases. Since the nature is fractal, there exists a great many of the mathematical models for them based on the other calculi due to the limitation of the classical models for them.