1,721,089 research outputs found
Rilassamento viscoso delle tensioni termiche in un solido a conducibilità termica variabile
No full text
Analisi termoelastica in regime transitorio di una barra di combustibile nucleare con conducibilità termica variabile
No full text
LMFBR fuel rod response in natural convection heat decay removal
No full textThis paper describes the fuel rod response in a pool type liquid metal fast breeder reactor, in shutdown natural convection heat removal. The fuel rod response is studied resorting to a finite element technique; the transient temperature and thermal stresses profiles are found.For this aim the code FENHT (Finite Element Nuclear Heat Transfer), has been developed: it is based on a one-dimensional three nodal finite element subdivion of the fuel rod and the solution of the pertinent heat transfer equations is performed by the Crank-Nicholson integration method. Although the strongly non linearities, arising from the thermal properties of the system and from the boundary conditions,the computing time is very low and the numerical solution isreached without undesiderable oscillatio
Numerical Transient Analysis of Parallel and Counter Flow Heat Exchangers
No full textNumerical transient solutions of parallel and counter current heat transfer processes are obtained by the use of a finite element technique. Solutions provide the one dimensional temperature profile for both fluids of the heat exchangers.The results are verified with steady state and transient analytical or numerical solutions available in literature. The numerical method is applicable to the thermal analysis of anykind of parallel and counter flow heat exchanger with arbitraryinitial and inlet conditions.The main features of the mathematical model, adopted to solve the energy balance equations, is the use of the Galerkin finite elements method to linearize the system of partial differential equations.Very satisfactory results in extremely low computation time arerealized on a medium size computer
- …
