57 research outputs found
Realistic modeling of leakage and intrusion flows through leak openings in pipes
The hydraulics of leakage and intrusion flows through leak openings in pipes is complicated by variations in the leak areas owing
to changes in pressure. This paper argues that the pressure–area relationship can reasonably be assumed to be a linear function, and a modified
orifice equation is proposed for more realistic modeling of leakage and intrusion flows. The properties of the modified orifice equation are
explored for different classes of leak openings. The implications for the current practice of using a power equation to model leakage and
intrusion flows are then investigated. A mathematical proof is proposed for an equation linking the parameters of the modified orifice and
power equations using the concept of a dimensionless leakage number. The leakage exponent of a given leak opening is shown to generally
not be constant with variations in pressure and to approach infinity when the leakage number approaches a value of minus one. Significant
modeling errors may result if the power equation is extrapolated beyond its calibration pressure range or at high exponent values. It is
concluded that the modified orifice equation and leakage number provide a more realistic description of leakage and intrusion flows,
and it is recommended that this approach be adopted in modeling studies
Elementary Model to Predict the Pressure Loss across a Spacer Grid Without a Mixing Vane
The Low-Power CO2 Removal and Compression System: Design Advances and Development Status
Thermal-Hydraulic Performance Analysis and Tube Inlet Orifice Design of a Once-Through Steam Generator
Uniform Heated Scaled-Down Standard Fuel Block Test to Validate Core Thermofluid Analysis Code for Prismatic Gas-Cooled Reactor
Experimental and Computational Assessment of Core Bypass Flow in Block-Type Very High Temperature Reactor
Simplified Hybrid Laminar Flow Control for the A320 Fin Aerodynamic and System Design - First Results
A flight test with a simplified HLFC system on the vertical tail plane of an A320 aircraft was performed in April/May 2018. The aerodynamic and system design is discussed and first results of the flight tests are presented
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