scholarly journals INVESTIGATION OF THERMOHYDRAULIC AND NEUTRON -PHYSICAL CHARACTERISTICS OF PERSPECTIVE FUEL ASSEMBLY FOR LOW-POWER REACTOR FACILITY

2018 ◽  
Vol 20 (7-8) ◽  
pp. 23-34 ◽  
Author(s):  
Yu. V. Smorchkova ◽  
E. A. Avdonina ◽  
A. V. Dedov
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Fuel Assembly ◽  
Power Reactor ◽  
Numerical Study ◽  
Physical Characteristics ◽  
Reactor Facility ◽  
Working Capacity ◽  
Reactor Installation ◽  
Fuel Elements

The paper presents the results of a numerical study of hydrodynamics and a temperature field in the model of the fuel assembly for the KLT-40S reactor installation in the transition to a fuel consisting of spherical microfuels. The optimal design of a model of a f uel assembly with microfuels for a reactor installation KLT-40S is proposed, from the position of hydrodynamics and heat transfer. The fuel assembly by external dimensions completely corresponds to the traditional assembly with rod fuel elements. The optim al parameters of the perforation of the covers that retain the pebble bed of microfuels are determined. The results of the evaluation of neutron-physical characteristics are presented. The working capacity of the KLT-40S reactor installation is shown when using fuel from microfuel elements.

A Numerical Study on the Temperature Field of Oscillatory Flow Reactor with Conic Ring Baffles

2012 ◽  
Vol 455-456 ◽  
pp. 121-126 ◽  
Author(s):  
Peng Wu ◽  
Jia Wu ◽  
Wei Li
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Oscillatory Flow ◽  
Flow Reactor ◽  
Numerical Study ◽  
Maximum Temperature ◽  
Vortex Interaction ◽  
3 Dimensional ◽  
Bias Flow ◽  
Experimental Researches

In published papers, the experimental researches have been carried out on heat transfer in Oscillatory Flow Reac-tors (OFRs) with annular baffles in both batch and continuous modes. It’s found that even with low net flow rates (or without net flow) the heat transfer properties of OFR can match turbu-lent pipe flow. But there’s no paper shows the micro-structure of temperature field in OFRs to illustrate the heat transfer mechan-ism. In this paper, we report our 3-dimensional numerical simu-lation results of heat transfer of OFR with novel conic ring baf-fles which is particularly suitable for liquid-solid systems. The temperature field of conic baffled OFR was obtained by using the commercial CFD package CFX11.0. It’s found that in “soft” mix-ing region the maximum temperature gradient lies approximate-ly in the middle of each cell, i.e. between the two pairs of vortices. It can be speculated that the convection caused by the intense vortex interaction leads to heat transfer essentially. When it’s global mixing, severe bias flow occurs. The temperature field becomes more chaotic and the heat convection is caused by more disordered vortex interaction.

Numerical Study of Butt Joining by Coaxial Powder Injection

2011 ◽  
Vol 227 ◽  
pp. 17-22
Author(s):  
El Hachemi Amara ◽  
Toufik Tamsaout ◽  
Karim Kheloufi ◽  
Herman Berger ◽  
Sisa Pityana
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Numerical Study ◽  
Powder Injection ◽  
Butt Welding ◽  
Numerical Resolution ◽  
Physical Mechanisms ◽  
Transfer Equations ◽  
Mesh Method ◽  
Complex Boundary

A 3-D transient modelling based on the numerical resolution of the fluid flow ant the heat transfer equations is developed for butt welding using the cladding process. The physical mechanisms included in our model concern the matter melting, and the re-solidification. The implementation of developed procedures called User Defined Functions (UDFs) working interactively with Fluent CFD code, and a dynamic mesh method, allows to treat the problem with its specific and complex boundary conditions. The fusion, resolidification, and the temperature dependence of the physical properties are taken into account. As results, clad formation and information on the temperature field are obtained.

Numerical Study of Transient Conjugate Heat Transfer in a Long Two-Phase Pipeline

2000 ◽  
Author(s):  
Yuri V. Fairuzov ◽  
Hector Arvizu Dal Piaz
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Conjugate Heat Transfer ◽  
Pipe Wall ◽  
Numerical Study ◽  
Electrical Heating ◽  
Practical Significance ◽  
Local Thermal Equilibrium ◽  
Working Fluid ◽  
Two Phase

Abstract A growing number of multiphase technology applications stimulate the development of reliable methods for modeling transient processes in two-phase systems in which the temperature field in the moving fluid and the temperature field in the bounding walls are directly dependent on each other. This situation presents a conjugate heat-transfer problem since the heat-transfer rate at the wall-fluid interface and local fluid conditions are not known a priori, and therefore need to be simultaneously calculated. Examples of such processes include the direct heating of multiphase pipelines, a change of heat load in evaporators of two-phase thermal control systems, startup or shutdown of systems with a two-phase working fluid. In this paper, direct electrical heating of a long two-phase pipeline has been modeled. The modeling of transient two-phase flow and heat transfer in the pipeline is based on two different mathematical formulations. In the first formulation, the transient heat conduction and the forced convection effects are rigorously taken into account. The second formulation assumes that the pipe wall and the fluid are in local thermal equilibrium. The effect of the thermal capacity of the pipe wall is taken into account by an additional term in the energy equation for the fluid flow. Such an approach allows significant simplifying the problem and reducing the computer running time. Numerical simulation of the sudden heat input to the pipe wall has been performed using both formulations of field equations. The practical significance of the results obtained is discussed.

Thermal Stress and Deformation Analysis of HP Casing During Shutdown of CPR1000 Nuclear Steam Turbine

2017 ◽  
Author(s):  
Yanan Guo ◽  
Danmei Xie
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Steam Turbine ◽  
Numerical Study ◽  
Convection Heat Transfer ◽  
Deformation Analysis ◽  
Calculation Results ◽  
Stress And Deformation

Taking a CPR 1000 nuclear steam turbine HP casing as an example, this paper carried out the numerical study to investigate on the deformation of the casing during shutdown. Based on ProE software, a 3D model for the HP casing was established at first. Secondly, the heat transfer coefficient of every surface of HP casing of the shutdown was calculated by using convection heat transfer coefficient formula in detail, ignoring radiative heat transfer inside the casing. Then, the finite element method was used to calculate and analyze the shutdown of HP casing’s temperature field. In the calculation process, the third boundary condition was used to apply steam temperature and heat transfer coefficient to each area of the HP casing. Finally, the calculation results of the temperature field were used as the input conditions to calculate the stress and strain of the casing, and the possible reasons for the HP casing’s deformation were obtained.

Numerical Study on Three-Dimensional Steady-State Temperature Field of a Gasoline Engine

2012 ◽  
Vol 569 ◽  
pp. 610-614
Author(s):  
Guan Xiong Wang ◽  
Hai Bo Chen ◽  
Zhao Cheng Yuan ◽  
Wei Lu
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Temperature Field ◽  
Gasoline Engine ◽  
Numerical Study ◽  
Three Dimensional ◽  
Cooling Water ◽  
Heat Transfer Analysis ◽  
Water Jacket ◽  
Coupled Heat Transfer

Today CFD is an important tool for engineers in the automotive industry. To simulate and optimize the fluid flow and heat transfer in the engine, the research is carried out. The geometric models of a gasoline engine and the cooling water jacket are simplified by Pro/E software firstly. Then solid - liquid coupled heat transfer analysis is done by using CFD software FLUENT. Temperature field distributions in the engine body and the cooling water jacket are obtained. An engine temperature test bench is set up, on which temperature values of key points are measured. The analysis on the errors between the experimental data and the calculation results shows that the temperature distributions in the engine are reasonable and the cooling performance of the water jacket meets the design requirements. The deviations between the experimental data and calculated values on the measuring points are not big, so the calculation method has high accuracy. The data obtained in this experiment can be used as the basis in the following study.

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