A method and device for void fraction measurement in a gas/liquid two-phase stratified flow system in disclosed. A couple of pressure-signal tubes are mounted to the through into the top and bottom walls of the horizontal pipeline portion of the flow system to measure the pressure differential value between the top and bottom interior position thereof. The height of liquid phase level of the stratified flow is calculated from the pressure differential value and the liquid-phase density. The void fraction is derived from the known geometric relation between the height of liquid-phase level and the cross section of the pipe. Each of the pressure-signal tubes is encased within a cylindrical cooling case to avoid flashing phenomenon from occurring within the pressure-signal tube. This method is applicable for the flow at steady or transient state under high temperature/pressure condition.
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