Stationary convective regimes in a thin vertical layer under the local heating from below

Kondrashov, А. N.; BURKOVA, E.V.

doi:10.1016/j.ijheatmasstransfer.2017.10.096

Cited by 11 publications

(3 citation statements)

References 43 publications

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“…Batchelor (1954) presented the classical theory of the steady laminar plume. The experimental and numerical results have also well characterized the laminar plume (Kondrashov & Burkova 2018). With an increase in the governing parameters (e.g.…”

Section: Introductionmentioning

confidence: 68%

Experiment of a thermal plume on an open cylinder

Zhang,

Nie,

2023

J. Fluid Mech.

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In this study, we performed a set of experiments of the thermal plume on an open cylinder heated from below and a simple scaling analysis. The flow structure of the plume was visualized using the shadowgraph technique, and the temperature at specific points was measured using a thermistor. Transient plumes in a developing stage, an equilibrating stage and a fully developed stage were described. The new scaling laws of the stem radius and the velocity of the rising plume were presented, which are different from those on a two-dimensional heated plate due to the cylindrical effect and agree with experimental results. In the fully developed stage, there is a transition route of the plume from a steady to chaotic state with an increase in the Rayleigh number, which involves a series of bifurcations. A reverse bifurcation from a periodic (Ra = 1.17 × 106) back to a steady (Ra = 1.30 × 106) state has been observed in the experiment, which is referred to as the period bubbling bifurcation. Thus, the present experimental results validate the previous numerical results presented by Zhang et al. (Phys. Fluids, vol. 33 (6), 2021, 064110). The bifurcation diagram, spectral analysis and attractor are used to characterize the transitional plume. In addition, the heat and mass transfer have also been quantified.

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Section: Introductionmentioning

confidence: 68%

Experiment of a thermal plume on an open cylinder

Zhang,

Nie,

2023

J. Fluid Mech.

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“…When acceleration occurs, the detected temperatures change, but only by small amount. It has been found that the Zaxis detection accelerometer has a close relation with the natural convection of the flow inside a cavity heated from below [48][49][50][51][52][53]. In recent years, many researchers have found that boundary conditions [48,49] and heater geometry [50,51] have substantial impact on the pattern of these convective flows.…”

Section: Introductionmentioning

confidence: 99%

“…It has been found that the Zaxis detection accelerometer has a close relation with the natural convection of the flow inside a cavity heated from below [48][49][50][51][52][53]. In recent years, many researchers have found that boundary conditions [48,49] and heater geometry [50,51] have substantial impact on the pattern of these convective flows. Because of the temperature distribution, the local heating of the quiescent air over the heater surface produces density gradient directed toward the decrease in the medium temperature, and convective flow occurs in the form of thermal plume when the buoyancy exceeds the viscous friction [53].…”

Section: Introductionmentioning

confidence: 99%

Tri-axis convective accelerometer with closed-loop heat source

Dau

Dinh

Tran

et al. 2018

Sensors and Actuators A: Physical

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In this paper, we report the details and findings of a study on tri-axis convective accelerometer, which is designed with the closed-loop type heat source and thermal sensing hotwire elements. The closed-loop heat source enhances the convective flow to the central part where a hotwire is placed to measure the vertical component of acceleration. The simulation was conducted using numerical analysis, and the device was prototyped by additive manufacturing. The device, functioning as a tilt sensor and an accelerometer, was tested up to acceleration of 20g.The experiments were successfully conducted and the experimental results agreed reasonably with those obtained by numerical analysis. The results demonstrated that the closed-loop heat source could reduce the cross effect between the acceleration components. The scale factor and cross-sensitivity had the values of 0.26 μV/g and 1.2%, respectively. The cross-sensitivity and the effects of heating power were also investigated in this study.

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