scholarly journals Analysis of the cladding melt relocation along the surface of the fuel pin with help of the SAFR module

2021 ◽  
Vol 2057 (1) ◽  
pp. 012126
Author(s):  
E V Usov ◽  
P D Lobanov ◽  
I A Klimonov ◽  
T V Sycheva ◽  
V I Chuhno ◽  
...  
Keyword(s):  
Flow Regime ◽  
Good Accuracy ◽  
Film Flow ◽  
Main Flow ◽  
Heated Part ◽  
Laminar Film ◽  
Fuel Pin

Abstract The presented work is dedicated to the development of approaches to simulate cladding melt relocation along the surface of the fuel pin. Development of the approaches is based on the results of the experiments carried out at the NSI RAS and IT SB RAS. Features of the melt relocation are studied in the experiments. It is demonstrated that the laminar film flow regime in the heated part of the fuel simulator is the main flow regime. Model of the melt relocation is constructed. This model is the part of the SAFR module of the EUCLID/V2 coupled code. It is shown that the proposed approaches allow simulating the melt relocation with good accuracy.

scholarly journals A study of film thickness and hydrodynamic entrance length in liquid laminar film flow along a vertical tube

AIChE Journal ◽  
2018 ◽  
Vol 64 (6) ◽  
pp. 2078-2088 ◽  
Author(s):  
Hongxia Gao ◽  
Xiao Luo ◽  
Ding Cui ◽  
Zhiwu Liang ◽  
Xiayi Hu ◽  
...  
Keyword(s):  
Film Thickness ◽  
Film Flow ◽  
Vertical Tube ◽  
Entrance Length ◽  
Laminar Film

Laminar Film Flow down a Right Circular Cone

1976 ◽  
Vol 15 (2) ◽  
pp. 91-94 ◽  
Author(s):  
Richard L. Zollars ◽  
William B. Krantz
Keyword(s):  
Film Flow ◽  
Circular Cone ◽  
Laminar Film

scholarly journals Numerical analysis of a leading edge tubercle hydrofoil in turbulent regime

2019 ◽  
Vol 878 ◽  
pp. 292-305 ◽  
Author(s):  
Blanca Pena ◽  
Ema Muk-Pavic ◽  
Giles Thomas ◽  
Patrick Fitzsimmons
Keyword(s):  
Numerical Analysis ◽  
Turbulent Flow ◽  
Flow Regime ◽  
Leading Edge ◽  
Reynolds Numbers ◽  
Main Flow ◽  
Hydrodynamic Performance ◽  
Turbulent Regime ◽  
Transitional Regime ◽  
Turbulent Flow Regime

This paper presents a numerical performance evaluation of the leading edge tubercles hydrofoil with particular focus on a fully turbulent flow regime. Efforts were focused on the setting up of an appropriate numerical approach required for an in-depth analysis of this phenomenon, being able to predict the main flow features and the hydrodynamic performance of the foil when operating at high Reynolds numbers. The numerical analysis was conducted using an improved delayed detached eddy simulation for Reynolds numbers corresponding to the transitional and fully turbulent flow regimes at different angles of attack for the pre-stall and post-stall regimes. The results show that tubercles operating in turbulent flow improve the hydrodynamic performance of the foil when compared to a transitional flow regime. Flow separation was identified behind the tubercle troughs, but was significantly reduced when operating in a turbulent regime and for which we have identified the main flow mechanisms. This finding confirms that the tubercle effect identified in a transitional regime is not lost in a turbulent flow. Furthermore, when the hydrofoil operates in the turbulent flow regime, the transition to a turbulent regime takes place further upstream. This phenomenon suppresses a formation of a laminar separation bubble and therefore the hydrofoil exhibits a superior hydrodynamic performance when compared to the same foil in the transitional regime.

Laminar film flow on a cylindrical surface

1976 ◽  
Vol 74 (2) ◽  
pp. 297-315 ◽  
Author(s):  
Ernst Becker
Keyword(s):  
Stagnation Point ◽  
Cylindrical Surface ◽  
Film Flow ◽  
Stokes Equations ◽  
Inviscid Flow ◽  
Navier Stokes ◽  
Point Problem ◽  
Navier Stokes Equations ◽  
Laminar Film ◽  
Particular Solution

The paper deals with steady laminar film flow which is set up at the cylindrical surface of an idealized horizontal ‘road’ when homogeneous ‘rain’ is falling onto the road in a vertical downward direction. It is shown that a particular solution of the Navier-Stokes equations is possible for which the depth of the liquid film is constant. In that case the Navier-Stokes equations reduce to the equations governing plane stagnation-point flow. However, the boundary conditions differ from those for the classical stagnation-point problem. Solutions for nearly inviscid flow and predominantly viscous flow are derived analytically. In particular, simple formulae for the depth of the film are found in both cases. Finally, the importance of the particular solution as a member of a whole class of solutions is discussed on the basis of a momentum integral approximation.

Gas–liquid mass transfer in an internally finned monolith operated countercurrently in the film flow regime

1999 ◽  
Vol 54 (21) ◽  
pp. 5119-5125 ◽  
Author(s):  
P.J.M. Lebens ◽  
J.J. Heiszwolf ◽  
F. Kapteijn ◽  
S.T. Sie ◽  
J.A. Moulijn
Keyword(s):  
Mass Transfer ◽  
Flow Regime ◽  
Film Flow ◽  
Liquid Mass ◽  
Liquid Mass Transfer
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