scholarly journals Helium mass flow measurement in the International Fusion Superconducting Magnet Test Facility

1986 ◽  
Author(s):  
L. R. Baylor
Keyword(s):  
Mass Flow ◽  
Flow Measurement ◽  
Superconducting Magnet ◽  
Test Facility

Pressure, temperature and helium mass flow development during a quench in the UNK superconducting magnet system

1992 ◽  
Vol 28 (1) ◽  
pp. 186-189 ◽  
Author(s):  
V.I. Deev ◽  
V.S. Kharitonov ◽  
V.V. Shako ◽  
A.I. Ageyev ◽  
S.R. Bakhuliev ◽  
...  
Keyword(s):  
Mass Flow ◽  
Superconducting Magnet ◽  
Magnet System ◽  
Flow Development ◽  
Superconducting Magnet System

scholarly journals Stability tests of the Westinghouse coil in the International Fusion Superconducting Magnet Test Facility

1988 ◽  
Vol 24 (2) ◽  
pp. 779-782 ◽  
Author(s):  
L. Dresner ◽  
D.T. Fehling ◽  
M.S. Lubell ◽  
J.W. Lue ◽  
J.N. Luton ◽  
...  
Keyword(s):  
Superconducting Magnet ◽  
Test Facility ◽  
Stability Tests

Thermal anemometry for mass flow measurement in oscillating cryogenic gas flows

1993 ◽  
Vol 64 (11) ◽  
pp. 3229-3235 ◽  
Author(s):  
Wayne Rawlins ◽  
Ray Radebaugh ◽  
Klaus D. Timmerhaus
Keyword(s):  
Mass Flow ◽  
Flow Measurement ◽  
Gas Flows

Experimental and Numerical Modeling of Transition Matrix From Momentum to Buoyancy-Driven Flow in a Pressurized Water Reactor

2008 ◽  
Author(s):  
Thomas Ho¨hne ◽  
So¨ren Kliem ◽  
Roman Vaibar
Keyword(s):  
Mass Flow ◽  
Transition Matrix ◽  
Turbulence Models ◽  
Wire Mesh ◽  
Test Facility ◽  
Pressurized Water ◽  
Flow Rates ◽  
Water Reactor ◽  
Ansys Cfx ◽  
Mass Flow Rates

The influence of density differences on the mixing of the primary loop inventory and the Emergency Core Cooling (ECC) water in the cold leg and downcomer of a Pressurised Water Reactor (PWR) was analyzed at the ROssendorf COolant Mixing (ROCOM) test facility. This paper presents a matrix of ROCOM experiments in which water with the same or higher density was injected into a cold leg of the reactor model with already established natural circulation conditions at different low mass flow rates. Wire-mesh sensors measuring the concentration of a tracer in the injected water were installed in the cold leg, upper and lower part of the downcomer. A transition matrix from momentum to buoyancy-driven flow experiments was selected for validation of the CFD software ANSYS CFX. A hybrid mesh with 4 million elements was used for the calculations. The turbulence models usually applied in such cases assume that turbulence is isotropic, whilst buoyancy actually induces anisotropy. Thus, in this paper, higher order turbulence models have been developed and implemented which take into account for that anisotropy. Buoyancy generated source and dissipation terms were proposed and introduced into the balance equations for the turbulent kinetic energy. The results of the experiments and of the numerical calculations show that mixing strongly depends on buoyancy effects: At higher mass flow rates (close to nominal conditions) the injected slug propagates in the circumferential direction around the core barrel. Buoyancy effects reduce this circumferential propagation with lower mass flow rates and/or higher density differences. The ECC water falls in an almost vertical path and reaches the lower downcomer sensor directly below the inlet nozzle. Therefore, density effects play an important role during natural convection with ECC injection in PWR and should be also considered in Pressurized Thermal Shock (PTS) scenarios. ANSYS CFX was able to predict the observed flow patterns and mixing phenomena quite well.

Receiver Outlet Temperature Control for Falling Particle Receiver Applications

2021 ◽  
Author(s):  
Nathan Schroeder ◽  
Henk Laubscher ◽  
Brantley Mills ◽  
Clifford K. Ho
Keyword(s):  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Temperature Rise ◽  
Pid Controller ◽  
Input Parameter ◽  
Slide Gate ◽  
Process Variable ◽  
Test Facility ◽  
Outlet Temperature

Abstract Falling particle receivers (FPRs) are being studied in concentrating solar power applications to enable high temperatures for supercritical CO2 (sCO2) Brayton power cycles. The falling particles are introduced into the cavity receiver via a linear actuated slide gate and irradiated by concentrated sunlight. The thickness of the particle curtain associated with the slide-gate opening dimension dictates the mass flow rate of the particle curtain. A thicker, higher mass flow rate, particle curtain would typically be associated with a smaller temperature rise through the receiver, and a thinner, lower mass flow rate, particle curtain would result in a larger temperature rise. Using the receiver outlet temperature as the process variable and the linear actuated slide gate as the input parameter a proportional, integral, and derivative (PID) controller was implemented to control the temperature of the particles leaving the receiver. The PID parameters were tuned to respond in a quick and stable manner. The PID controlled slide gate was tested using the 1 MW receiver at the National Solar Thermal Test Facility (NSTTF). The receiver outlet temperature was ramped from ambient to 800°C then maintained at the setpoint temperature. After reaching a steady-state, perturbations of 15%–20% of the initial power were applied by removing heliostats to simulate passing clouds. The PID controller reacted to the change in the input power by adjusting the mass flow rate through the receiver to maintain a constant receiver outlet temperature. A goal of ±2σ ≤ 10°C in the outlet temperature for the 5 minutes following the perturbation was achieved.

scholarly journals Determination of the uncertainty of mass flow measurement using the orifice for different values of the Reynolds number

2019 ◽  
Vol 213 ◽  
pp. 02022 ◽  
Author(s):  
Anna Golijanek-Jędrzejczyk ◽  
Andrzej Mrowiec ◽  
Robert Hanus ◽  
Marcin Zych ◽  
Dariusz Świsulski
Keyword(s):  
Reynolds Number ◽  
Mass Flow ◽  
Flow Measurement ◽  
Laboratory Experiments ◽  
Energy Industry ◽  
Maximum Difference ◽  
Know How ◽  
Simulation And Experiment ◽  
Extended Uncertainty

Standard orifice flowmeters are widely used in the chemical and energy industry. Therefore, it is essential to know how accurate the measurements made with these instruments are. The paper presents an estimation of measurement uncertainty of a liquid mass flow using the orifice plate. The authors will present the influence of ranges of the Reynolds number on the estimated uncertainty, obtained on the basis of simulation and laboratory experiments. The research was conducted for the central orifice in the Reynolds number 8,000 < Re < 21,000. The results of estimating the extended uncertainty of the measurement of water flow using simulation and experimental method, are convergent. The maximum difference in the extended uncertainty values of flow measurement for the simulation and experiment was 0.04.10-3 kg/s.

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