Moderate Prandtl Number Nanofluid Thermocapillary Convection Instability in Rectangular Cavity

Zhou, Xiaoming; Chi, Faxuan; Jiang, Yanni; Chen, Qi-Sheng

doi:10.1007/s12217-022-09940-9

Cited by 7 publications

(2 citation statements)

References 28 publications

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“…Steady-state Numerical investigations on thermocapillary-buoyancy convection were carried out by previous researchers [22][23][24], these computation results indicate that the nanoparticles can influence the flow pattern and heat transfer of thermocapillarybuoyancy convection. Zhou et al [25,26] first reported the oscillation characteristics and evolution process of large and moderate Prandtl number nanofluid thermocapillary convection. Abdullah et al [27] analyzed the linear stability of its nanofluid Marangoni convection in a thin liquid layer under vertical temperature gradient.…”

Section: Introductionmentioning

confidence: 99%

Thermocapillary Convection of Evaporating Thin Nanofluid Layer in a Rectangular Cavity

Tao,

Liu,

Qin

et al. 2023

Microgravity Sci. Technol.

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Thermocapillary convection of nanofluid with evaporating phase change interface occurs in a variety of industrial processes such as micro/nano fabrication, ink-jet printing, and thin film coatings, etc. Previous studies have mostly focused on the phenomena of thermocapillary convection in pure fluids without phase change. This paper reports the first fundamental experimental work on thermocapillary flow of nanofluid thin liquid layer under effect of evaporation. This research focuses on the behavior of volatile thin nanofluid liquid layer in a rectangular test cell under the effects of horizontal temperature gradient. The buoyancy effect can be ignored inside this thin liquid layer, which is similar to the results in microgravity condition. HEE7200 and HFE7200-Al2O3 nanofluid are used as working fluid to analyze the effect of nanoparticles addition. The results indicate that the linear relationship between the thickness of the liquid layer and the duration of evaporation does not change by nanoparticles addition. HFE7200-Al2O3 nanofluid always has higher evaporation rate than its base fluid in the temperature difference range of 2.98 to 13.92℃. The critical Marangoni number for nanofluid is lower than that of pure fluid, which indicates that nanoparticles addition promotes the flow pattern transition.

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Section: Introductionmentioning

confidence: 99%

Thermocapillary Convection of Evaporating Thin Nanofluid Layer in a Rectangular Cavity

Tao,

Liu,

Qin

et al. 2023

Microgravity Sci. Technol.

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“…Under microgravity conditions, the finite volume method was applied to calculate in the liquid bridge with various volume ratios to determine the dynamic evolution of temperature disturbance during the beginning of oscillation instability. Zhou et al [29,30] conducted a numerical study on the thermocapillary convection of nanofluids with medium and large Prandtl numbers in a rectangular cavity. The critical temperature difference of the unsteady flow is obtained via varying the thermal gradient, and the influence of the volume fraction of nanoparticles on the critical temperature gradient is analyzed.…”

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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Effect of Interfacial Heat Transfer on Hydrothermal Wave Propagation of Nanofluid Thermocapillary Convection in Rectangular Cavity

Jiang,

Dai,

Zhou

2024

Microgravity Sci. Technol.

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Moderate Prandtl Number Nanofluid Thermocapillary Convection Instability in Rectangular Cavity

Cited by 7 publications

References 28 publications

Thermocapillary Convection of Evaporating Thin Nanofluid Layer in a Rectangular Cavity

Thermocapillary Convection of Evaporating Thin Nanofluid Layer in a Rectangular Cavity

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

Effect of Interfacial Heat Transfer on Hydrothermal Wave Propagation of Nanofluid Thermocapillary Convection in Rectangular Cavity

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