Showing papers in "Nuclear Engineering and Design in 2022"

TL;DR: In this article , a set of mathematic models suitable for flow boiling simulation and CHF prediction in rod bundle channels of PWR, including Eulerian two-phase model combined with wall boiling model, were established using CFD method.

TL;DR: In this paper , the ANSYS Fluent is used to perform thermal calculations on the heat pipe thermoelectric generator (HPTEG) prototype for both normal and accident conditions which include heat pipe failure and loss of heat sink accident conditions.

TL;DR: In this paper , the effect of the shape and width of the channel cross-section on heat transfer and flow characteristics were analyzed in detail and a new PCHE design recommendation was proposed.

TL;DR: In this paper , an updated version of the long-term MIT-NTHU modeling effort on the hydraulics of hexagonal arrays of wire wrapped fuel pins is presented, which is called the Pacio-Chen-Todreas Detailed model (PCTD).

TL;DR: The use of OpenFOAM as a multi-physics library for nuclear applications has grown from a sporadic use for exploratory studies to a widespread application for the analysis of innovative reactor concepts and highly complex problems as discussed by the authors .

TL;DR: In this article , a series of simulations of the flow characteristics for a butterfly check valve in a small modular reactor employing the computational fluid dynamics (CFD) method was performed to obtain the relationship between the valve loss coefficient and the valve opening angle.

TL;DR: In this paper , a transfer learning framework with diverse transfer strategies is proposed on basis of a pre-trained CNN model to deal with the problem of limited labeled data in target tasks.

TL;DR: In this article , the OpenFOAM solver implemented with k − ε - kθ - εθ turbulent heat transfer model was developed and used to study the flow and heat transfer characteristics of liquid metal sodium.

TL;DR: In this article , the authors evaluated the impact of the seismic load case on the capital cost of a nuclear power plant in terms of vessel weights and horizontal accelerations and found that seismic isolation can reduce the total cost of equipment by a factor for five.

TL;DR: In this paper , a methodology for multi-objective optimization of control drum operation for a micro-reactor under normal and off-nominal conditions is presented, where the control drum configuration is optimized for the reactor to be critical with some desired power distribution that would satisfy peak limits.

TL;DR: In this article , a phase change material (PCMMC) based thermal energy storage (TES) system was proposed for a nuclear power plant to better follow the variations of power grid demand especially in countries with a high share of nuclear in their energy mix.

TL;DR: In this article , the impact of the seismic load case on the engineering and construction cost and time must be substantially mitigated by using seismic isolation, a mature technology that has been used for more than 30 years in non-nuclear sectors to substantially reduce earthquake demands in buildings and other infrastructure.

TL;DR: In this article , a coarse-mesh turbulence model based on local flow features is proposed for the transient analysis of thermal mixing and stratification in a sodium-cooled fast reactor. But the model is not suitable for modeling complex thermal-fluid phenomena during transients.

TL;DR: A fundamental description of the use of burnable absorbers and their impacts on reactivity, absorber depletion, self-shielding, and basic thermophysical properties is given in this article .

TL;DR: In this paper , the fragility analysis of the PCCV (tested at Sandia National Laboratories (SNL)) subjected to internal pressure is conducted using the probability density evolution method (PDEM).

TL;DR: In this paper , a mechanism model of the coupling of ion migration and fluid dynamics of the heat transfer tube on the secondary side of the steam generator is established, and the sensitivity of the migration process of impurity ions to metal corrosion was analyzed and discussed.

TL;DR: In this article , the authors explored the underlying physics of the steam cavity/plume shapes by condensing supersonic steam exhausting from five different bevelled nozzles into quiescent water tank.

TL;DR: In this article , an experimental investigation on heat transfer deterioration and the discussion of visualized flow states for supercritical CO2 flow in a non-circular channel were proposed, where a significant blurred shadow, induced by local density variations, was photographed in near heated wall region as heat transfer degradation occurred.

TL;DR: In this article , two phase change models, namely the Lee model and Tanasawa model, are implemented and assessed with experimental data, and a single vapor bubble condensation in subcooled quiescent water is analyzed.

TL;DR: In this paper , the heat transfer performance of high temperature potassium heat pipes (Φ28 × 800 mm) were tested under different heating power (300-1000 W), wick mesh (600 and 800), filling charge amount (20 g and 50 g) and inclination angle (0°, 45°, 90°).

TL;DR: The PLINIUS prototypic corium experimental platform has been upgraded with more powerful induction generator for e.g. MCCI experiments, development of thermitic melting, and new water flooding facility: MERELAVA as mentioned in this paper .

TL;DR: In this paper , a novel approach was proposed to predict deteriorated heat transfer to supercritical pressure fluids by considering the experimental trends of a meaningful series of experimental data, taking into consideration the modifications that the axial velocity profile undergoes at the entrance of a bare tube, when a supercritical heat fluid is heated at the wall and decreases its density owing to thermal expansion, giving rise to buoyancy effects.

TL;DR: In this article , the authors presented an updated version of the long-term MIT-NTHU modeling effort on the hydraulics of hexagonal arrays of wire wrapped fuel pins.

TL;DR: In this paper , numerical simulations have been performed on the previous experiments with the varied flow temperature and the simulation results have confirmed that the tangential oscillation has been initiated in the thermal-mixing process.

TL;DR: In this paper , a coupled heat and mass transfer model for the nitrogen-assisted drying of the waste cladding porous medium is established, and the influence of nitrogen flow rate, temperature and inlet position on the heat transfer characteristics of the porous medium in the nitrogen assisted drying of waste claddings is analyzed.

TL;DR: In this article , the dependency of the characteristics of the thin liquid layer for downward cocurrent annular flows has been studied using conductance probes, and new correlations for the liquid film thicknesses and the two major properties of the interfacial waves have been developed based on the best fit of all the series of experiments carried out in this study.

TL;DR: In this article , a multiphysics solver for the analysis of the Molten Salt Fast Reactor (MSFR) design is presented, with the main focus on the simulation of the behavior of Gaseous Fission Products (GFPs) inside the core and their interactions with a helium bubbling system.

TL;DR: In this article , the authors summarize the experimental results obtained in the large-scale thermal-hydraulics PANDA facility (PSI, Switzerland) within the OECD/NEA HYMERES2 project.

TL;DR: In this paper , a numerical model is developed to calculate instantaneous bubble interfacial area based on the VOF method, and a new correlation is derived to associate the normalized bubble inter-surface area with Eötvös and Galilei numbers.

TL;DR: In this paper , a novel neutronic and thermohydraulic study of a SMR-PWR with TRISO fuel is carried out, where a 2 n multifactorial statistical analysis is applied to evaluate the multiplicative properties of the TRISO.