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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 42 for “"Natural circulation"”.
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A comparison of forced and natural circulation steam generators.
… an increasing number of references to forced circulation boilers. Most of these articles extol the virtues of some one kind of boiler or tend to justify the conventional natural circulation principles. The range of boiler types covered by the term "forced circulation" is much broader than …
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Stability analysis of a natural circulation lead-cooled fast reactor
… thermal hydraulics stability analysis of a natural circulation lead cooled fast reactor design. The stability concerns arise from the fact that natural circulation operation makes the system susceptible to flow instabilities similar to those observed in boiling water reactors. In order to …
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Computer techniques for sensor validation during EBR-II natural circulation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1984.
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Numerical Analysis of Supercritical Flow Instabilities in a Natural Circulation Loop
Made available in DSpace on 2017-07-06T18:48:46Z (GMT). No. of bitstreams: 3 Jain_Prashant_K_MS.pdf: 1475769 bytes, checksum: de28ea4595d23c21af5e05d49bc03232 (MD5) Jain_Prashant_K_MS_ABS.pdf: 30312 bytes, checksum: ba1d06b19c99d6fc394fb3fd7050693c (MD5) license.txt: 4813 bytes, checksum: …
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Stability analysis of natural circulation in BWRs at high pressure conditions
At rated conditions, a natural circulation boiling water reactor (NCBWR) depends completely on buoyancy to remove heat from the reactor core. This raises the issue of potential unstable flow. oscillations. The objective of this work is to assess the characteristics of stability in a NCBWR at rated …
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A method to determine the performance of a natural-circulation evaporator
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1953.
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Nonlinear Modelling and Stability Analysis of a Subcolled Boiling, Natural Circulation Loop
Made available in DSpace on 2017-07-06T18:48:46Z (GMT). No. of bitstreams: 3 Jackson_Christopher_J_MS.pdf: 53891675 bytes, checksum: ed29c2c1100bf759abee63301232e85b (MD5) Jackson_Christopher_J_MS_ABS.pdf: 537366 bytes, checksum: 5ffecb8f9cceaf5d84559fa5c17095fc (MD5) license.txt: 4813 bytes, …
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One-dimensional single phase natural circulation model of FLiNaK in Molten Salt Loop
… for a molten salt type reactor in terms of a natural circulation behavior. A natural circulation model using MATLAB was developed. This model is for the Molten Salt Loop currently under development at University of Ontario Institute of Technology to investigate aging related degradation …
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CFD Modeling and Simulation of Natural Circulation in Helium- Cooled Very High Temperature Reactors
… investigates the thermal-hydraulic behavior of natural circulation in helium-cooled Very High Temperature Reactor (VHTR) systems, focusing on the performance and validation of passive safety features under Pressurized or Depressurized Loss of Forced Cooling (P-LOFC or D-LOFC) events. An …
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Stability and Bifurcation Analyses of Reduced-Order Models of Forced and Natural Circulation BWRs
… current BWRs, and in improved design of future natural circulation BWR systems.
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Experimental investigation of two-phase instability in natural circulation with direct transient local measurement
… Proper handling of the stability problem under natural circulation is critical for the reactor safety and operation under important conditions such as the start-up transient of natural circulation cooled boiling water reactors. This experimental research focuses on the two-phase instability …
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Plenum-to-plenum heat transfer characteristics under natural circulation in a scaled-down prismatic modular reactor
… of Science and Technology (S&T) has developed a natural convection heat transfer test facility with one riser and one downcomer between two plena to investigate loss of flow accident scenario (LOFA) for a prismatic very high temperature reactor (VHTR). Using advanced heat transfer coefficient …
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Validation Studies of Single-Phase Natural Circulation Response of the Fluoride salt-cooled High-temperature Reactor (FHR)
… problems. A single phase, one dimensional, natural circulation code is more suited to validating with simple university experiments. A code designed for lead bismuth eutectic at the Bhabha Atomic Research Centre (BARC) was modified to use it to model the flow in the decay heat removal system …
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Experimental investigations of natural circulation in a separate-and-mixed effects test facility mimicking prismatic modular reactor (PMR) core
… attention was directed to investigate natural circulation thermal-hydraulics in Prismatic Modular Reactors (PMRs). Natural circulation is employed as a passive safety feature that passively removes the decay heat released after the loss of flow accidents (LOFA). Several computational …
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Investigation of the ability of RELAP5/MOD3 to model natural circulation of high pressure SF6 in the Westinghouse 1/7 scale PWR experimental facility
Thesis: M.S., Massachusetts Institute of Technology, Department of Nuclear Engineering, 1992
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Effect of helium injection on diffusion dominated air ingress accidents in pebble bed reactors
… air diffusion (SCAD) method at preventing natural circulation onset in diffusion dominated air ingress accidents. The analysis presented in this thesis starts with a vertically oriented rupture of a coaxial pipe. Air enters into the reactor cavity at a rate dictated by diffusion, until the …
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Air Ingress and Heat-Driven Flow Relaminarization in a Very High Temperature Reactor (VHTR)
… of passive safety systems including intra-core natural circulation for heat removal in accident scenarios. However, a number of substantial engineering challenges are expected in VHTRs, and due to the high temperatures of the coolant involved, material behavior in various components needs to be …
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Blind benchmark predictions of the NACOK air ingress tests using the CFD code FLUENT
… experiments examine the combined effects of natural convection during an air ingress event: diffusion, onset of natural circulation, graphite oxidation and multicomponent chemical reactions. MIT has been benchmarking JAERI tests using the FLUENT code for approximately three years [1]. This …
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The flow structure under mixed convection in a uniformly heated vertical pipe
… development, passive emergency cooling using natural circulation of a gas at an elevated pressure is being considered. Since GFR cores have high power density and low thermal inertia, relative to the high temperature gas-cooled thermal reactor (HTGR), the decay heat removal (DHR) in …
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Liquid Sodium Stratication Prediction and Simulation in a Two-Dimensional Slice
… volumes because stratification can counteract natural circulation and fatigue materials. This work features steady-state and transient simulations of thermal stratification and natural circulation of liquid sodium in a simple rectangular slice using a commercial CFD code (ANSYS FLUENT). …
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