The influence of viscosity and surface tension on gas-liquid separation performance was studied in an experimental filter device.The Ohnesorge number was used to analyze the droplet concentration at the outlet of the filter.The viscosity of liquid has little influence on the pressure drop of filter

while the surface tension has a significant influence.Both viscosity and surface tension have significant influences on the outlet droplet concentration.Lower viscosity and higher surface tension lead to higher droplet concentration.Larger Ohnesorge number leads to lower droplet concentration at the outlet.