Two-phase cryogenic flow meters: Part II – How to realize the two-phase pressure drop method

The pressure drop method to find the mass flow rate of the two-phase helium and hydrogen flows is discussed in this paper. This method is based on a combination of the narrowing device and the RF void fraction sensor described earlier. Advantages of this approach with respect to the calorimetric one are demonstrated and its metrological characteristics for different flow patterns are estimated. The discussed cryogenic technologies and methods may be used for others applications, for example, to solve some tasks in oil-producing industry.

► A system for measuring the mass flow rate of two-phase cryogenic flows is presented.
► It is based on a pressure-drop method.
► Operation for different flow patterns is analyzed and the error is estimated.
► Practical applications of the measuring system have been discussed.