The design of an apparatus for determination of Joule-Thomson coefficients is presented. An axial flow porous plug is utilized and the downstream flow is so arranged that one concentric flow path serves as a heat shield for the other. This guard-ring principle, together with virtual elimination of radiation and convection heat transfer, reduces the heat leakage that has been associated with previous axial-flow designs. A prototype was constructed and tested with gaseous nitrogen. The Joule-Thomson coefficients obtained agree, in the range 2-20 atmosphere and 50-150 C, within one per cent with published values.

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