Study of natural convection in a heated cavity with magnetic fields normal to the main circulation

Chen, Long; Liu, Bai-Qi; Ni, Ming-Jiu

doi:10.1016/j.ijheatmasstransfer.2018.06.019

Cited by 11 publications

(11 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All these features have been implemented in a code called MHD-UCAS [1]. The code was intensively tested in the past for laminar flows [1][2][3]. More testing results can be found in reference [36] for shearinduced MHD turbulence.…”

Section: Mathematical Formulationmentioning

confidence: 99%

“…This study is a comprehensive investigation of coupled magnetohydrodynamic (MHD) flow/heat transfer phenomena in a liquid metal (LM) fusion blanket model (or prototype) via a series of high-fidelity 3D numerical computations by utilizing a MHD computational code called "MHD-UCAS" developed at the University of Chinese Academy of Science [1][2][3]36]. In doing so, we try to keep the model geometry, flow parameters and environmental conditions as close to a typical fusion blanket design as possible.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Toward full simulations for a liquid metal blanket: MHD flow computations for a PbLi blanket prototype at Ha ∼ 10⁴

Chen

Smolentsev

2020

Nucl. Fusion

View full text Add to dashboard Cite

Numerical simulations of liquid metal (LM) magnetohydrodynamic (MHD) flows in a prototypical dual coolant lead lithium (DCLL) blanket module have been performed under conditions relevant to a real LM blanket system, i.e. strong magnetic field of 5 T (Hartmann number Ha ~10 4 ) and poloidal flow velocity of 0.1 m s −1 (Reynolds number Re ~10 5 ). The proposed blanket model includes all essential sub-components of a real LM blanket: radial supply ducts, inlet and outlet manifolds, multiple poloidal ducts and a U-turn zone. The computations were performed using a DNS-like finite-volume code on a very fine mesh of ~320 × 10 6 cells to accurately capture all flow features. Four cases have been simulated, including: Case 1 for electrically conducting walls, Case 4 for non-conducting walls, and Cases 2 and 3 with partial SiC FCIs electrical insulation of the blanket conduits using silicon carbide flow channel inserts placed at selected locations. In these four cases, the computed MHD flows were analyzed for: (1) MHD pressure drop, (2) flow distribution, (3) flows in particular blanket components, (4) 3D and flow development effects, and (5) unsteady flows. Many important conclusions have been made, regarding effectiveness of the FCI to reduce the MHD pressure drop, flow balancing in the parallel channels, characteristic flow patterns in all blanket sub-components, electromagnetic coupling between the flows, 3D MHD effects, flow development length, and unsteady effects. This study is limited to purely MHD flows. Next study will focus on a DCLL blanket with a volumetric heating.

show abstract

Section: Mathematical Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Toward full simulations for a liquid metal blanket: MHD flow computations for a PbLi blanket prototype at Ha ∼ 10⁴

Chen

Smolentsev

2020

Nucl. Fusion

View full text Add to dashboard Cite

show abstract

“…This phenomenon has also been observed in duct flow (Sukoriansky, Zilberman & Branover 1986; Zikanov et al. 2019), electromagnetically driven square cavity flow (Pothérat & Klein 2017) and vertical convection flow in a square container under the influence of magnetic fields (Chen, Liu & Ni 2018).…”

Section: Resultsmentioning

confidence: 61%

Effects of horizontal magnetic fields on turbulent Rayleigh–Bénard convection in a cuboid vessel with aspect ratio Γ = 5

Chen,

Wang,

2024

J. Fluid Mech.

Self Cite

View full text Add to dashboard Cite

Direct numerical simulations have been conducted to investigate turbulent Rayleigh– Bénard convection (RBC) of liquid metal in a cuboid vessel with aspect ratio $\varGamma =5$ under an imposed horizontal magnetic field. Flows with Prandtl number $Pr=0.033$ , Rayleigh numbers ranging up to $Ra\leq 10^{7}$ , and Chandrasekhar numbers up to $Q\leq 9 \times 10^6$ are considered. For weak magnetic fields, our findings reveal that a previously undiscovered decreasing region precedes the enhancement of heat transfer and kinetic energy. For moderate magnetic fields, we have reproduced the reversals of the large-scale flow, which are considered a reorganization process of the roll-like structures that were reported experimentally by Yanagisawa et al. (Phys. Rev. E, vol. 83, 2011, 036307). Nevertheless, the proposed approach of skewed-varicose instability has been substantiated as insufficient to elucidate fundamentally the phenomenon of flow reversal, an occurrence bearing a striking resemblance to the large-scale intermittency observed in magnetic channel flows. As we increase the magnetic field strength further, we observe that the energy dissipation of the system comes primarily from the viscous dissipation within the boundary layer. Consequently, the dependence of Reynolds number $Re$ on $Q$ approaches a scaling as $Re\,Pr/Ra^{2/3} \sim Q^{-1/3}$ . At the same time, we find the law for the cutoff frequency that separates large quasi-two-dimensional scales from small three-dimensional ones in RBC flow, which scales with the interaction parameter as ${\sim }N^{1/3}$ .

show abstract

“…Researchers [49] found that the SMF could eliminate the solute segregation in the growth process of semiconductor single crystals by eliminating thermal convection in the melt. Subsequently, the braking effect of SMFs on solidification was widely studied, ranging from pure metals to alloys [9,10] and from experiments to numerical simulations [84][85][86][87]. Although these studies have deepened our understanding of the braking effect, the weak MFD still limits our ability to provide a pure diffusive growth condition suitable for the steady growth of metallic crystals.…”

Section: Magnetic Braking Effect During Solidificationmentioning

confidence: 99%

Review on Eutectic-Type Alloys Solidified under Static Magnetic Field

et al. 2023

View full text Add to dashboard Cite

Processing metallic alloys under a static magnetic field (SMF) has garnered significant attention over the past few decades. SMFs can influence both the thermodynamics and kinetics of the solidification process by introducing extra force and energy. Eutectic-type alloys (ETAs) are commonly used as research materials under SMFs due to their featured microstructures. This review aims to present theoretical and experimental results regarding ETAs under SMFs, from post-analysis to in situ observation, to demonstrate the effects of magnetic phenomena such as magnetic braking, thermoelectric magnetic convection, magnetic gradient force, and magnetic energy on the thermodynamics and kinetics of microstructural evolution. In this paper, we adopt a hybrid approach between a review and an overview to comprehensively examine the effect of SMFs on the solidification process. Firstly, we provided a concise review of the historical research on the SMF’s impact on solidification in the literature. Next, we elucidated the basic physical principles of an SMF in material processing, followed by an introduction of numerous laboratory and industrial experiments that have utilized SMFs. Finally, we summarized the effects of SMFs on solidification in the past and provide insights into future research directions.

show abstract

Study of natural convection in a heated cavity with magnetic fields normal to the main circulation

Cited by 11 publications

References 36 publications

Toward full simulations for a liquid metal blanket: MHD flow computations for a PbLi blanket prototype at Ha ∼ 10⁴

Toward full simulations for a liquid metal blanket: MHD flow computations for a PbLi blanket prototype at Ha ∼ 10⁴

Effects of horizontal magnetic fields on turbulent Rayleigh–Bénard convection in a cuboid vessel with aspect ratio Γ = 5

Review on Eutectic-Type Alloys Solidified under Static Magnetic Field

Contact Info

Product

Resources

About

Study of natural convection in a heated cavity with magnetic fields normal to the main circulation

Cited by 11 publications

References 36 publications

Toward full simulations for a liquid metal blanket: MHD flow computations for a PbLi blanket prototype at Ha ∼ 104

Toward full simulations for a liquid metal blanket: MHD flow computations for a PbLi blanket prototype at Ha ∼ 104

Effects of horizontal magnetic fields on turbulent Rayleigh–Bénard convection in a cuboid vessel with aspect ratio Γ = 5

Review on Eutectic-Type Alloys Solidified under Static Magnetic Field

Contact Info

Product

Resources

About

Toward full simulations for a liquid metal blanket: MHD flow computations for a PbLi blanket prototype at Ha ∼ 10⁴

Toward full simulations for a liquid metal blanket: MHD flow computations for a PbLi blanket prototype at Ha ∼ 10⁴