Thermal hydraulics is a branch of science and engineering that deals with the study of the behavior of fluids, such as water or air, under the influence of heat transfer. This field focuses on how heat is transferred between a solid surface and a fluid, and how this affects the flow patterns and heat exchange processes within a system. Thermal hydraulics is particularly important in the design and operation of nuclear reactors, power plants, and other systems where heat transfer and fluid flow are critical to the overall performance and safety of the system. Researchers in this area use mathematical modeling, computer simulations, and experimental techniques to better understand and optimize thermal hydraulic systems.