The present numerical study analyzes the car fuel filler pipe using a three-dimensional steady as well as unsteady VOF (Volume of Fluid) method. The unsteady calculations show that fuel is separated from liquid and gas by gravity. The liquid velocity ...
The present numerical study analyzes the car fuel filler pipe using a three-dimensional steady as well as unsteady VOF (Volume of Fluid) method. The unsteady calculations show that fuel is separated from liquid and gas by gravity. The liquid velocity of pipe depends on the pipe gradient. Air pockets are found at regions with sharp bends in a small radius pipe region. The results of unsteady calculation show that the main reason of bubble generation in a fuel tank may not be due to cavitation or separation in a pipe. To design optimal fuel filler pipes, it is necessary to design pipes with nearly identical gradient as possible and reduce regions of the suddenly decreasing radius.