Abstract
In order to grasp water flow pattern in a hot water storage tank, we perform an experiment that visualize water flow in such tanks. Analysis of this visualization leads us to create a new model of turbulent thermal diffusivity for macroscopic simulation of thermal distribution in tanks. Our CFD analysis validates vertical profile of turbulent thermal diffusivity that this model assumes. As a result of tuning parameters in this model by means of CFD analysis and macroscopic simulation, We find that the simulation with the model predict thermal distribution much better than that without the model.
