Abstract
In order to measure the time-dependent pressure change in Oscillating Heat Pipe (OHP), we used the flow path of glass tube which has three branches for pressure measurement. Three temperatures at the glass tube surface and three pressures in OHP were measured at the same time. We verified that the pressures increase by about 2 to 15 kPa just before large movement of liquid column in the whole of flow path. We assume that this pressure increase is due to rapid vaporization of small droplet of working fluid at heating section. It changes the pressure balance in OHP and lead to large movement of liquid column.
