Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 07, 2019 - November 08, 2019
The gas-liquid two-phase flow in a simplified evaporator that has multi-pass channels and cool the air as an automobile component was numerically analyzed. One of the issues was evenly distributing refrigerant to channels. In this study, we tried simulating air/water two-phase flow instead of refrigerant two-phase flow by particle method that represents air and water with particles. To solve this incompressible air/water two-phase flow, this study used the moving particle semi-implicit (MPS) method that is one of particle methods. Numerical reproduction was intended to form small water droplets in channels, splash, clear air/water interface and water flow distribution into channels. We found that collision distance and density difference between air and water particles remarkably influenced on forming air/water two-phase interface. Small water droplets, splash and air/water interface were formed clearly. In this simulation, large collision distance enough to move gently and pressure relaxation caused by density difference both contributed to the above objective result. In addition, water tended to flow in the upstream channels and reduced gradually in the direction of the downstream as the same result as the experimental results. Downstream waves were numerically produced by collision between upstream and downstream water every 0.4 second. The period was almost the same as the experimental period of 0.3 second.
