A VISUAL STUDY OF RADIAL INWARD CHOKED FLOW OF LIQUID NITROGEN

摘要

Data and high speed movies were acquired on pressurized subcooied liquid nitrogen flowing radially inward through a 0.0076 cm (3-mil) gap. The stagnation pressure ranged from 0.7 to 4MN/m2 (0.2 ≤ P/Pc ≤ 1.2). The results of this quali¬tative study indicate:n1. Steady radial inward choked floW appears equivalent to steady choked flow through axisymmetric nozzles.n2. Transient choked flows through the radial gap are not uniform and the discharge pattern appears as nonuniform impinging jets.n3. The critical mass flow rate data for the transient case appear different from those for the steady case. On the mass flow, rate vs pressure map, the slope and separation of the isotherms appear to be less for transient than for steady radial choked flow.