Modeling and numerical simulation of cold and hot fluid mixing in a T-junction

In practical engineering, a T-junction has large size and strict parameter conditions, so it is necessary to model the actual working conditions in order to conduct experimental research. A vertical T-junction model was established with the momentum ratio as the main similarity criterion and high temperature heat-conducting oil as the medium to ensure the thermal similarity between the prototype and the model in terms of temperature difference, velocity ratio and diameter ratio. Large Eddy Simulation was used to validate the prototype and the model, and the time distributions of temperature and velocity were compared. The results show that the flow field and temperature field of the prototype and model T-junction are similar, and it is therefore feasible to use heat transfer oil as the medium and the momentum ratio similarity to model the mixed cold and hot fluids in a T-junction.