Buoyancy and Thermocapillary Driven Flows in an Open Cavity With Bottom Heating and Symmetrical Cooling From Sides

Nithyadevi, N.; Begum, Shamadhani; Shankar, C. Udhaya

doi:10.18280/ijht.330109

Cited by 8 publications

(5 citation statements)

References 11 publications

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“…The other parameters are as follows: electrode-plate mass ratio R'=0.1, plate thickness 2h=200 m, electrodes radii R 0 =620 m, R 1 =720 m and R 2 =1,500 m. The trapped modes are the interest modes and found in the narrow frequency interval determined by Eq (14). By this equation, it is determined that Figure 2.…”

Section: Numerical Simulation and Results Analysismentioning

confidence: 98%

“…Since a 1 is about half of a 2 , the electrode size varied more violently than the plate thickness with the same temperature change. Based on these values,   and   were calculated by Eq (14). In each case, the two trapped modes of interest were found in the frequency interval.…”

Section: Numerical Simulation and Results Analysismentioning

confidence: 99%

“…In crystal filters, however, two square electrodes are arranged above the piezoelectric crystals. The acoustic waves from the square electrodes propagate in all directions [12][13], leading to concentrated electric field, stress and temperature [14] in the electrode corners. In this case, the materials may deteriorate or even fail.…”

Section: Introductionmentioning

confidence: 99%

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Thermal expansion effect on thickness-shear vibrations in a piezoelectric quartz filter with dot-ring electrodes

Li¹,

Liu²

2018

IJHT

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This paper aims to disclose the thermal expansion effect on thickness-shear vibrations of quartz filters. To this end, a brand-new "dot-ring" electrode structure was proposed for quartz filter operating in thickness-shear modes (TSMs). Then, a reasonable solution to the government equations of thermal expansion was derived, and the thermal expansion effect on the operation modes and vibration frequencies of the filter were examined in details. Through the rational design of electrode size and quartz plate thickness, a frequency interval was determined with two trapped modes. Under the working temperature between -55°C and 85°C, the electrode sizes changed with the thermal expansion; the resonance frequency declined with the increase of temperature. However, the frequency difference considering the thermal expansion effect is extremely small, indicating that the quartz crystal filter has good thermal stability. The research findings shed new light on the design of quartz filters.

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Section: Numerical Simulation and Results Analysismentioning

confidence: 98%

Section: Numerical Simulation and Results Analysismentioning

confidence: 99%

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Thermal expansion effect on thickness-shear vibrations in a piezoelectric quartz filter with dot-ring electrodes

Li¹,

Liu²

2018

IJHT

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“…Thermocapillary convection has received a considerable attention in recent years since it plays the key role in a variety of industrial processes such as crystal growth [1], thin film coating [2], laser welding [3], cooling of electronic devices [4], glass manufacturing and some chemical processing [5]. Initially, researchers conducted extensive research on the stability of thermocapillary convection without phase change interfaces [6][7][8][9][10].…”

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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“…It has been found that an increase in Rayleigh number and heat source length enhances the heat transfer inside the enclosure. Thereafter, further studies have been conducted to analyze different effects such as heat source position, aspect ratio, inclination of the enclosure and others may be found in [21][22][23][24][25][26][27][28][29]. For the second category when the heat source produces a uniform heat flux, Sharif and Mohammad [30] have numerically studied the same configuration as [20], where the heat source at the lower wall has been replaced with a uniform heat flux source.…”

Section: Introductionmentioning

confidence: 99%

Finite Volume Simulation of Natural Convection for Power-Law Fluids with Temperature-Dependent Viscosity in a Square Cavity with a Localized Heat Source

Daghab¹,

Kaddiri²,

Raghay³

et al. 2021

IJHT

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In this paper, numerical study on natural convection heat transfer for confined thermo-dependent power-law fluids is conducted. The geometry of interest is a fluid-filled square enclosure where a uniform flux heating element embedded on its lower wall is cooled from the vertical walls while the remaining parts of the cavity are insulated, without slipping conditions at all the solid boundaries. The governing partial differential equations written in terms of non-dimensional velocities, pressure and temperature formulation with the corresponding boundary conditions are discretized using a finite volume method in a staggered grid system. Coupled equations of conservation are solved through iterative Semi Implicit Method for Pressure Linked Equation (SIMPLE) algorithm. The effects of pertinent parameters, which are Rayleigh number (103 ≤ Ra ≤ 106), power-law index (0.6 ≤ n ≤ 1.4), Pearson number (0 ≤ m ≤ 20) and length of the heat source (0.2 ≤ W ≤ 0.8) on the cooling performance are investigated. The results indicate that the cooling performance of the enclosure is improved with increasing Pearson and Rayleigh numbers as well as with decreasing power-law index and heat source length.

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Buoyancy and Thermocapillary Driven Flows in an Open Cavity With Bottom Heating and Symmetrical Cooling From Sides

Cited by 8 publications

References 11 publications

Thermal expansion effect on thickness-shear vibrations in a piezoelectric quartz filter with dot-ring electrodes

Thermal expansion effect on thickness-shear vibrations in a piezoelectric quartz filter with dot-ring electrodes

Thermocapillary Convection of Evaporating Thin Nanofluid Layer in a Rectangular Cavity

Finite Volume Simulation of Natural Convection for Power-Law Fluids with Temperature-Dependent Viscosity in a Square Cavity with a Localized Heat Source

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