Thermal Analysis of Irradiated Fuel Subassemblies and Fuel Pins During Storage in Concrete Pits of Head-End Facility

2015 ◽  
Vol 8 (1) ◽  
Author(s):  
M. Rajendrakumar ◽  
K. Velusamy ◽  
P. Selvaraj ◽  
P. Chellapandi
Keyword(s):  
Radiation Heat Transfer ◽  
Three Dimensional ◽  
Concrete Structures ◽  
Heat Transfer Analysis ◽  
Fuel Pin ◽  
Parametric Studies ◽  
Test Reactor ◽  
Forced Cooling ◽  
Conjugate Conduction ◽  
Irradiated Fuel

Irradiated fuel subassembly (SA)/fuel pins, with significant decay heat are transported from reactor and stored in hot cells (HCs) before reprocessing. During transportation they are heavily shielded and no forced cooling is provided. The HCs are made of concrete structures, the outer surfaces of which are force cooled. During these processes, the fuel pin clad temperature and concrete temperatures are to be limited within specific safety limits. These temperatures are function of the decay power and geometric details of surrounding structures. To predict these temperatures, three-dimensional conjugate conduction–convection–radiation heat transfer analysis has been carried out. For this purpose, the computational fluid dynamics (CFD) code STAR-CD has been utilized, wherein individual fuel pins, steel cans, hexagonal wrapper, lead shielding blocks, and concrete structures have been considered in detail. Based on parametric studies pertaining to fuel pin transportation, it is established that for a decay power of 150 W, natural convection is adequate with maximum clad temperature of 686 K. From the studies related to storage in HCs, it is seen that nine fast breeder test reactor (FBTR) SA can stored in hot cell-1 (HC-1), with a decay power of 31.3 W per SA, to respect the temperature limits. For 3 prototype fast breeder reactor (PFBR) cans and 2 FBTR cans stored in hot cell-3 (HC-3), a decay power of 12.5 W per FBTR can and 44 W per PFBR can, can be handled without exceeding temperature limits.

scholarly journals 3-D Thermomechanical Tire–Pavement Interaction Model for Evaluation of Pavement Skid Resistance

2020 ◽  
pp. 036119812096310
Author(s):  
K. Anupam ◽  
T. Tang ◽  
C. Kasbergen ◽  
A. Scarpas ◽  
S. Erkens
Keyword(s):  
Ambient Temperature ◽  
Three Dimensional ◽  
Interaction Model ◽  
Surface Characteristics ◽  
Heat Transfer Analysis ◽  
Skid Resistance ◽  
Proposed Model ◽  
Parametric Studies ◽  
Pavement Temperature ◽  
Effects Of Temperature

Skid resistance is known to be affected by environmental conditions such as ambient temperature and pavement temperature. Finite element (FE) modeling has been an effective and efficient way to study the effects of temperature on skid resistance. However, existing FE models either are not able to incorporate the pavement surface characteristics or only perform heat transfer analysis per the two-dimensional (2-D) cross-section of the tire, which could lead to inaccurate predictions of skid resistance. Therefore, the aim of the current study was to develop a three-dimensional, coupled thermomechanical tire–pavement interaction model to investigate the variations in skid resistance as a function of ambient temperature and pavement temperature. The advantages and capability of the proposed model were highlighted by comparing the tire temperature profiles predicted by the proposed model and by the existing 2-D staggered model. Parametric studies of various factors that affect skid resistance were carried out. On the basis of the output results, a relationship between skid resistance and different parameters is proposed.

A Numerical Investigation of Ray Tracing Method in a View Factor Calculation Procedure for Zonal Radiation Heat Transfer in Complex Systems

2009 ◽  
Author(s):  
German Malikov ◽  
Vladimir Lisienko ◽  
Roman Koptelov ◽  
Jakov Kalugin ◽  
Raymond Viskanta
Keyword(s):  
Heat Transfer ◽  
Ray Tracing ◽  
Direct Method ◽  
Radiation Heat Transfer ◽  
Three Dimensional ◽  
Heat Transfer Analysis ◽  
View Factor ◽  
Radiation Heat ◽  
Zonal Method ◽  
Metallurgical Furnaces

In this paper a variety of well known computer graphics algorithms (Binary Spatial Partitioning-BSP, Bounding Box-BB, and direct method of sequential search) for ray tracing are studied numerically in the context of the view factor calculations for the zonal method of radiation heat transfer analysis in complex industrial furnace geometries. The paper reports on a modified BSP algorithm which takes into account the specific types of obstructions and their arrangement in different types of metallurgical furnaces. The modified algorithm enhances the ray tracing calculations by two to three orders of magnitude. An universal algorithm to obtain an intersection with a polyhedron obstruction is developed. The method is tested for simple three dimensional and complex furnace geometries.

Analysis of Gas Convection and Temperature Distribution in a Rotating Wafer in a Cylindrical Lamp Heating Apparatus

2002 ◽  
Author(s):  
Shigeki Hirasawa ◽  
Shigenao Maruyama
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Thermal Processing ◽  
Radiation Heat Transfer ◽  
Three Dimensional ◽  
Convection Heat Transfer ◽  
Heat Transfer Analysis ◽  
Gas Velocity ◽  
Radiation Heat ◽  
Heating Rates

A three-dimensional radiation-heat-transfer analysis and a convection-heat-transfer analysis are combined in order to determine the temperature distribution in a rotating wafer in a cylindrical lamp heating apparatus for rapid thermal processing. The calculated results show that the temperature variation in the wafer increases 1.4 K by the effect of natural convection, when inlet gas velocity is 0.1 m/s during 1273 K steady-state heating of the non-rotating wafer. The effect of gas convection on the temperature variations in the wafer can be minimized when the wafer is rotating in an axisymmetric apparatus and the heating rates of the lamps are optimally controlled.

scholarly journals Three-dimensional radiation heat transfer analysis in a cylindrical gas reformer by the radiative heat ray method.

1989 ◽  
Vol 55 (514) ◽  
pp. 1724-1728
Author(s):  
Hiroshi TANIGUCHI ◽  
Kazuhiko KUDO ◽  
Naoki KUMAGAI ◽  
Kehui GUO ◽  
Takao KATAYAMA ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Radiative Heat ◽  
Radiation Heat Transfer ◽  
Three Dimensional ◽  
Heat Transfer Analysis ◽  
Radiation Heat ◽  
Ray Method

Three-dimensional heat transfer analysis of flat-plate oscillating heat pipes

2021 ◽  
pp. 117189
Author(s):  
Kimihide Odagiri ◽  
Kieran Wolk ◽  
Stefano Cappucci ◽  
Stefano Morellina ◽  
Scott Roberts ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Flat Plate ◽  
Three Dimensional ◽  
Heat Pipes ◽  
Heat Transfer Analysis

scholarly journals A Method for Thermal Analysis of Spiral Bevel Gears

1996 ◽  
Vol 118 (4) ◽  
pp. 580-585 ◽  
Author(s):  
R. F. Handschuh ◽  
T. P. Kicher
Keyword(s):  
Three Dimensional ◽  
Contact Analysis ◽  
Heat Transfer Analysis ◽  
Maximum Pressure ◽  
Tooth Contact Analysis ◽  
Tooth Contact ◽  
Finite Element Program ◽  
Spiral Bevel Gears ◽  
Bevel Gears ◽  
Spiral Bevel

A modelling method for analyzing the three-dimensional thermal behavior of spiral bevel gears has been developed. The model surfaces are generated through application of differential geometry to the manufacturing process for face-milled spiral bevel gears. Contact on the gear surface is found by combining tooth contact analysis with three-dimensional Hertzian theory. The tooth contact analysis provides the principle curvatures and orientations of the two surfaces. This information is then used directly in the Hertzian analysis to find the contact size and maximum pressure. Heat generation during meshing is determined as a function of the applied load, sliding velocity, and coefficient of friction. Each of these factors change as the point of contact changes during meshing. A nonlinear finite element program was used to conduct the heat transfer analysis. This program permitted the time- and position-varying boundary conditions, found in operation, to be applied to a one-tooth model. An example model and analytical results are presented.

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