Objective
Development and experimental validation of models for the simulation of the discharge of flashing fluids from pressure vessels. The work comprises:
- experimental studies of the physical phenomena in the MPMC facility (presently composed of a 50 litre/20 bar pressure vessel, a vent line, and a 1m3 catch tank) and in flow visualisation facilities,
- development of the computer code RELIEF for vent system design,
- advancement of the modelling methods for multiphase flow.
A mass flow measurement device based on gamma densitometry has been built for 2 phase flow applications. The apparatus uses tomographic and correlative signal analysis. The nuclear magnetic resonance (NMR) mass flow measurement technique has been developed further and adapted to measurements in gas liquid mixtures.
An experimental database for the validation of vent design software has been established by test series in the MPMC facility involving water, foams, high viscosity fluids and hydrogen peroxide. High viscosity flow visualization tests have been made. Simple design methods have been developed for gas flow through pipeline fittings and for discharge of high viscosity fluids.
A fast running version of the venting computer code RELIEF has been completed. The possible importance of chemical reactions in the vent line has been demonstrated. The development of an input and output processor has been started.
A new approach for modelling inhomogeneous nonequilibrium 2 phase flow has been developed, which is expected to overcome deficiencies and limitations of existing models and codes. First numerical benchmark calculations indicate the advantage of the new approach.
Progress to end 1991
A mass-flow measurements device based on gamma-densitometry has been built for two-phase flow applications. The apparatus uses tomographic and correlative signal analysis. A patent for this system has been granted. The NMR mass-flow measurements technique has been developed further and adapted to measurements in gas- liquid mixtures. A patent has been filed.
An experimental databases for the validation of vent design software has been established by test series in the MPMC facility involving water, foams, high-viscosity fluids and hydrogen peroxide. High-viscosity flow visualisation tests have been made. Simple design methods have been developed for gas flow through pipeline fittings and for discharge of high-viscosity fluids.
A fast-running version of the venting code RELIEF has been completed. The possible importance of chemical reactions in the vent line has been demonstrated. The development of an input/output processor has been started.
A new approach for modelling inhomogeneous non-equilibrium two- phase flow has been developed, which is expected to overcome deficiencies and limitations of existing models and codes. First numerical benchmark calculations indicate the advantages of the new approach.
Detailed description of work foressen in 1992
Advanced two-phase mass flow measuring techniques:
- Experimental investigation of the gamma-densitometric mass flowmeter for reliability and accuracy under different flow patterns.
- Experimental verification of the NMR technique with systematic NMR measurements in oil-water-gas flows. Validation and improvements of the NMR software.
Venting experiments:
- Implementation of an advanced mass flow measurement system in the vent tube and optical void fraction probes in the vessel of the MPMC1 facility.
- Execution of selected venting tests in MPMC1.
- Test analysis, development of simple models for void fractions in vent tube and vessel.
- Modification of MPMC1 for the investigation of the venting of long, horizontal vessels.
- Flow visualisation studies in a long, horizontal plexiglas vessel.
- Construction of the scaled-up-facility MPMC2.
Computer code RELIEF:
- Completion of a first stand-alone version of RELIEF with an interactive input and output processor.
- Code validation.
- Completion of user documentation.
- Inclusion of a catch tank model.
- Inclusion of an animation feature in the input/output processor.
Advanced modelling methods:
- Extension of the chosen approach and its verification.
Short description of evolution of work in 1993
- Advanced measuring techniques based on high resolution gamma- ray tomography using array detectors.
- Venting tests of a long, horizontal vessel; data analysis and development of design methods. Commissioning of MPMC2; commencement test programme.
- RELIEF user support, extension of code capabilities.
- Start of multiphase/multicomponent flow code development based on the new modelling method.
Topic(s)
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21020 Ispra
Italy