Flow instabilities in thermocapillary liquid bridges between two coaxial disks with different radii

Wang, Yue; Zeng, Zhong; Líu, Hao; Zhang, Liangqi; Yin, Linmao; Xiao, Yao; Liu, Yong

doi:10.1016/j.ijheatmasstransfer.2021.122182

Cited by 14 publications

(2 citation statements)

References 49 publications

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“…Nayak et al 12 focused on the interfacial layer and shape effects of the nanoparticles of CNTs dispersed in water to explore the flow features of electromagnetic Darcy–Forchheimer flow. The study reported that "augmenting the interfacial layer parameter enhances heat transportation from the surfaces of the lower and upper disks.” Flow instabilities under microgravity for fluid flowing between co-axial disk was investigated by Wang et al 13 , Wang et al 14 . Vijay and Sharma 15 used FC-72-based nanofluid to examine the heat and mass transfer features of fluid flowing between co-axial rotating disks subjected to a magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Particle Swarm Optimization for exploring Darcy–Forchheimer flow of Casson fluid between co-axial rotating disks with the Cattaneo–Christov model

Uddin,

Upreti,

Ganga

et al. 2024

Sci Rep

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In this paper, we carried out a numerical analysis of the fluid dynamics and heat transfer occurring between two parallel disks. The study accounts for the impact of temperature-dependent fluid viscosity and thermal conductivity. We systematically investigated various parameters, including viscosity, thermal conductivity, rotational behavior (rotation or counter-rotation), and the presence of stretching, aiming to comprehend their effects on fluid velocity, temperature profiles, and pressure distributions. Our research constructs a mathematical model that intricately couples fluid heat transfer and pressure distribution within the rotating system. To solve this model, we employed the 'Particle Swarm Optimization' method in tandem with the finite difference approach. The results are presented through visual representations of fluid flow profiles, temperature, and pressure distributions along the rotational axis. The findings revealed that the change in Casson factor from 2.5 to 1.5 resulted in a reduction of skin friction by up to 65%, while the change in local Nusselt number was minimal. Furthermore, both the viscosity variation parameter and thermal conductivity parameters were found to play significant roles in regulating both skin friction and local Nusselt number. These findings will have practical relevance to scientists and engineers working in fields related to heat management, such as those involved in rotating gas turbines, computer storage devices, medical equipment, space vehicles, and various other applications.

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Section: Introductionmentioning

confidence: 99%

Particle Swarm Optimization for exploring Darcy–Forchheimer flow of Casson fluid between co-axial rotating disks with the Cattaneo–Christov model

Uddin,

Upreti,

Ganga

et al. 2024

Sci Rep

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“…The non-uniform distribution of impurities on the free surface of the melt can generate the solute capillary convection due to the concentration gradient. The convection is coupled with thermocapillary convection driven by the temperature gradient, and they form Marangoni convection on the free surface eventually [11,12]. A liquid bridge model can be utilized to explore this phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Effects of Temperature Difference and Heat Loss on Oscillation Characteristics of Thermo-Solutocapillary Convection in Toluene/N-Hexane Mixed Solution

2023

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During the crystal growth process using the floating zone method, the uneven distribution of impurities on the surface of the melt can trigger a coupling mechanism between solutocapillary convection driven by the concentration gradient and thermocapillary convection driven by the temperature gradient, resulting in the Marangoni convection at the free surface. When the temperature and concentration gradients reach certain values, the crystal surface and interior exhibit time-dependent, periodic oscillations, leading to the formation of micrometer-scale impurity stripes within the crystal. This study focuses on the effects of temperature difference and heat loss in a liquid bridge under microgravity on the structure and interface oscillation characteristics of thermo-solutocapillary convection, aiming to explore the coupling phenomenon of this oscillation and provide valuable information for crystal growth processes. An improved level set method is employed to accurately track every displacement of the interface, while the surface tension is addressed using the CSF model. In addition, the area compensation method is used to maintain simulation quality balance. A comprehensive analysis is performed on the oscillation characteristics of thermo-solutocapillary convection at the free surface, ranging from the temperature, concentration, deformation, and velocity distributions at the upper and middle heights of the liquid bridge. The results indicate that under small temperature differences (ΔT = 1 − 3), the transverse velocity at the upper end exhibits a single-periodic oscillation, while the longitudinal velocity presents a double-periodic oscillation. At the intermediate height, both the transverse and longitudinal velocities display a single-periodic oscillation. Under a large temperature difference (ΔT = 6), the oscillation of velocities at the upper end and the middle position become multi-periodic. In addition, heat loss has certain regular effects on the oscillatory flow of thermo-solutocapillary convection within a certain range. The velocity, amplitude, and frequency of the upper end and the middle position at the free surface decrease gradually, and the oscillation intensity also weakens with the increase in heat loss (Bi = 0.2 − 0.6). These new discoveries can provide a valuable reference for optimizing the crystal growth process, thereby enhancing the quality and performance of crystal materials.

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Liquid bridge solidification between two rods with curved caps

Ho,

2024

Chemical Engineering Science

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Flow instabilities in thermocapillary liquid bridges between two coaxial disks with different radii

Cited by 14 publications

References 49 publications

Particle Swarm Optimization for exploring Darcy–Forchheimer flow of Casson fluid between co-axial rotating disks with the Cattaneo–Christov model

Particle Swarm Optimization for exploring Darcy–Forchheimer flow of Casson fluid between co-axial rotating disks with the Cattaneo–Christov model

Effects of Temperature Difference and Heat Loss on Oscillation Characteristics of Thermo-Solutocapillary Convection in Toluene/N-Hexane Mixed Solution

Liquid bridge solidification between two rods with curved caps

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