Abstract
Slush hydrogen is a two-phase solid-liquid cryogenic fluid consisting of solid hydrogen particles in liquid hydrogen and its various applications are anticipated such as fuel for reusable space shuttles. At a solid mass ratio (solid fraction) of within 50%, piped transport can be conducted in the same way as for normal fluids. A new method is proposed for measuring the slush hydrogen mass flow rate using microwave method. Noting the slight fluctuation in the distribution of solid hydrogen particles in slush hydrogen, i.e., slush hydrogen density, waveguide-type densimeters are placed at two locations along the piped flow to measure the density and to detect the density fluctions. The flow velocity is also calculated from the densimeter distance and the delay time when the cross correlation function of the two density signals is at a maximum. This waveguide-type flowmeter has no moving mechanical parts in the flow stream. This.paper reports the development of a new slush hydrogen waveguide-type flowmeter, together with the fabrication of required test equipment, and confirmation of flowmeter accuracy.
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