Numerical modeling of the solidification phase change in a pipe and evaluation of the effect of boundary conditions

Jalali, Alireza; Najafi, Atabak

doi:10.1007/s11630-010-0403-z

Cited by 16 publications

(3 citation statements)

References 10 publications

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“…6 Surface tension is approximated by the continuum surface force (CSF) model. 7 The discrete equations are solved by using the first order upwind discretization scheme and the PISO pressure-velocity coupling scheme.…”

Section: Nnumerical Numerical Results and Analysismentioning

confidence: 99%

Vibration interference analysis and verification of micro-fluidic inertial switch

Liu

Yang

et al. 2014

AIP Advances

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The micro-fluidic inertial switch based on liquid metal utilizes the moving mercury droplet to close the switch under the action of acceleration, which is characterized by no moving parts, small contact resistance, long service life and large current. In addition to the requirement of response time, accuracy and reliability, the micro-fluidic inertial switch needs to overcome the impact of the ambient vibration. The influence of the ambient vibration on the performance of switch is investigated by loading pulse or sinusoidal interference signals in the X, Y and Z direction. The numerical results suggest that the performance of micro-fluidic inertial switch is greatly affected by impact interference signal in X sensitive direction as compared with low frequency harmonic signal. If the impact signal with high amplitude lasts only for a short time, the wrong operation might also occur. The interference signals in insensitive direction have a relatively small impact on the performance of switch, and the impact of interference signal can be reduced by reasonable structural design. Finally, anodic bonding, deep reactive ion etching (DRIE) and sputtering technique are adopted to fabricate the micro-fluidic inertial switch. The acceleration threshold of the prototype is tested. The experiment results agree with the numerical results, which indicate that the simulation method is valid.

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Section: Nnumerical Numerical Results and Analysismentioning

confidence: 99%

Vibration interference analysis and verification of micro-fluidic inertial switch

Liu

Yang

et al. 2014

AIP Advances

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“…Equation (4) represents the frictional dissipation of momentum in the MZ [30,31]. The enthalpy-porosity technique [32] is employed to trace the interface resulting from the phase change. Considering the thermal conductivity (κ) and volumetric heat source (S), the energy equation is written in terms of the enthalpy H (≡ h + H ) as:…”

Section: Property Empirical Relationmentioning

confidence: 99%

Numerical investigation of temperature distribution and melt pool geometry in laser beam welding of a Zr–1% Nb alloy nuclear fuel rod end cap

2019

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Zr-Nb alloys are used in the nuclear and chemical industries, in which the welding of an end cap to a fuel rod is a critical issue in manufacturing processes. To identify the optimal process parameters for achieving good-quality welds, it is necessary to investigate the thermal environment in the fusion and heat-affected zones. A three-dimensional computational fluid dynamics analysis is performed with a volumetric heat source by simulating the interaction of the heat source and the material and by accounting for the phase change during welding. The model incorporates the buoyancy force and Marangoni stress and generates the temperature distribution, weld bead geometry and fluid flow in the weld pool during the laser welding process.

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“…For isothermal phase change processes, the local liquid fraction occurringwhen the liquid changes to the solid-state is equal to zero if the temperature is lower than the melting temperature (T < T l ) else (T>T s ) it is equal to unity [51,55]. For non-isothermal case, there exists a mushy discontinuous zone where the liquid fraction varies from zero to unity and its ranges of temperature between that of liquid state and the solid-state [56][57][58][59][60][61][62][63][64][65][66][67][68]. It is observed that this discontinuity creates non-physical oscillations and instabilities during the solidification process, which needs to be specifically addressed for its elimination.…”

Section: Introductionmentioning

confidence: 99%

New model for PCM melting and solidification processes simulation

et al. 2021

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The numerical instabilities associated with solidification and melting processes are mainly due to the transient temperature field in liquid and solid phases and characteristics of the front phase. To prevent these instabilities, a new model for the liquid fraction is proposed in the present article and is based on the analytical Heaviside step function's approximation. The efficiency of the current model is well verified with the numerical simulation of one-and two-dimensional heat conduction problems within regular geometries and is further noticed that the results agree well with the analytical solutions. It is also noted that the proposed model provides more accurate results when compared to the Meshless Local Petrov-Galerkin (MLPG) method and is competent to resolve the above said instabilities.To examine its accuracy for any 2D-arbitrarily-shaped enclosures, a new solidification problem within a more complex geometry was proposed. This problem can be used as a benchmark test for solidification/melting problems. The proposed model was applied to solve this problem and accurate results are obtained. Hence, the previously reported approaches,which are not even able to ensure discrete conservation at the interface, may be replaced by the proposed interface model.

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Numerical modeling of the solidification phase change in a pipe and evaluation of the effect of boundary conditions

Cited by 16 publications

References 10 publications

Vibration interference analysis and verification of micro-fluidic inertial switch

Vibration interference analysis and verification of micro-fluidic inertial switch

Numerical investigation of temperature distribution and melt pool geometry in laser beam welding of a Zr–1% Nb alloy nuclear fuel rod end cap

New model for PCM melting and solidification processes simulation

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