Numerical simulations based on the MARS (Multi-interface Advection and Reconstruction Solver) developed by one of the authors have been performed in order to understand the heat transfer mechanism of falling film flows along a vertical wall. In the present study, we focused on an internal structure, i.e. velocity profile and heat transfer. In this study, the velocity profiles in a falling film are categorized into three regions: substrate film region, solitary wave region, and capillary wave region with each characteristic. Moreover, small vortices can be found in the capillary wave region. Additionally, numerical results indicate that heat transfer mechanism is different for these three regions. We proposed new heat transfer evaluation manner as a function of the Prandtl number for these regions. This manner could contribute to a design work of falling film flow device.

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