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A passive phase separator separates and traps gases that may be present in a liquid flowing through a system. The phase separator includes an inlet in fluid communication with a first separator chamber and an outlet in fluid communication with a second separator chamber that is disposed annularly ab

A passive phase separator separates and traps gases that may be present in a liquid flowing through a system. The phase separator includes an inlet in fluid communication with a first separator chamber and an outlet in fluid communication with a second separator chamber that is disposed annularly about the first separator chamber. Gas introduced into the first separator chamber is pushed downstream through the first separator chamber to a gas storage chamber. Once gas is trapped within the gas storage chamber it remains there for the entire operational life of the phase separator.

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1. A phase separator for separating phases of a two-phase mixture comprising: a housing including an inlet and an outlet;a first separator chamber within the housing, the first separator chamber including walls of porous material defining a passage from the inlet to a gas storage chamber through whi

1. A phase separator for separating phases of a two-phase mixture comprising: a housing including an inlet and an outlet;a first separator chamber within the housing, the first separator chamber including walls of porous material defining a passage from the inlet to a gas storage chamber through which a two-phase mixture of gas and liquid flows; anda second separator chamber within the housing, the second separator chamber including walls of a porous material defining a space open to the outlet and disposed about the first separator chamber through which at least some liquid flows to the outlet. 2. The phase separator as recited in claim 1, wherein first separator chamber comprises a pleated tube, with the pleats extending radially outward relative to the direction of liquid flow. 3. The phase separator as recited in claim 1, wherein the second chamber is disposed annularly about the first separator chamber. 4. The phase separator as recited in claim 1, wherein the second chamber comprises a pleated tube with pleats extending radially outward relative to the direction of liquid flow. 5. The phase separator as recited in claim 1, wherein the first separator chamber includes a first end in communication with the inlet and a second end distal from the first end in communication with the gas storage chamber. 6. The phase separator as recited in claim 5, wherein the second separator chamber is open to the outlet and closed to the gas storage chamber. 7. The phase separator as recited in claim 1, wherein the porous material defines a selectively permeable membrane that prevents through gas flow and provides for liquid through flow. 8. The phase separator as recited in claim 1, wherein the porous material comprises a wettable material. 9. The phase separator as recited in claim 1, wherein the porous material comprises a stainless steel filter cloth. 10. The phase separator as recited in claim 1, wherein the gas storage chamber is disposed outside of the second separator chamber and holds gas within the housing. 11. The phase separator as recited in claim 1, wherein the porous material prevents the flow of particulate matter from the inlet to the outlet. 12. A liquid circulation system comprising: a pump for circulating liquid flow through a circuit; anda phase separator for separating gas from the liquid flow, the phase separator including: a housing including an inlet and an outlet, a first separator chamber within the housing, the first separator chamber including walls of porous material defining a passage from the inlet to a gas storage chamber through which a two-phase mixture of gas and liquid flows; anda second separator chamber within the housing, the second separator chamber including walls of a porous material defining a space open to the outlet and disposed about the first separator chamber through which at least some liquid flows to the outlet. 13. The liquid circulation system as recited in claim 12, wherein at least one of the first separator chamber and the second separator chamber comprises a pleated tube, with the pleats extending radially outward relative to the direction of liquid flow. 14. The liquid circulation system as recited in claim 12, wherein the second chamber is disposed annularly about the first separator chamber. 15. The liquid circulation system as recited in claim 12, wherein the first separator chamber includes a first end in communication with the inlet and a second end distal from the first end in communication with the gas storage chamber and the second separator chamber is open only to the outlet. 16. A method of removing gas from a two-phase mixture comprising the steps of: flowing a two-phase mixture of gas and liquid through a first separator chamber from an inlet toward a gas storage chamber;flowing liquid through walls of the first separator chamber into a second separator chamber disposed about the first separator chamber and out an outlet; andtrapping gas within the gas storage chamber. 17. The method as recited in claim 16, including defining walls of the first separator chamber with a stainless steel filter cloth and flowing the two-phase mixture of gas and liquid parallel to the walls. 18. The method as recited in claim 17, including defining the walls to include a plurality of pleats extending radially outward transverse to the direction of liquid flow. 19. The method as recited in claim 17, wherein the stainless steel filter cloth comprises a wettable material and liquid flow coats the steel filter cloth to prevent gas from flowing through the walls of the first separator chamber. 20. The method as recited in claim 16, including the step of maintaining gas within the gas storage chamber for a predefined operational duration. 21. The method as recited in claim 16, wherein the method is performed in a microgravity environment.