Two-Dimensional Free Convection Heat Transfer Below a Horizontal Hot Isothermal Flat Strip

Samie, Milad; Nouri, Arash; Salari, Alinaghi; Shafii, Mohammad Behshad

doi:10.1115/1.4029742

Cited by 6 publications

(4 citation statements)

References 32 publications

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“…The ethanol vapor is more dense than the surrounding air and therefore the vapor stays near the substrate and does not form a rising plume. A thermally heated and cooled plate has been studied extensively in the literature. ,− A similar solution only exists for the case of a heated plate facing upward or a cooled plate facing downward. , Nevertheless, the underlying physical equations facilitate the understanding of the measured partial pressure field. Let us introduce dimensionless parameters for the concentration c , the hydrodynamic pressure ω, the positions x and y , and the respective velocities u and v : x̃ = x / L , ỹ = y / L , ũ = uL / v , ṽ = vL / v , ω̃ = ω L 2 /(ρ ∞ ν 2 ), and c̃ = ( c – c ∞ )/( c S – c ∞ ) .…”

Section: Resultsmentioning

confidence: 99%

Interferometric Imaging of Solvent Vapor of Evaporating Liquid Films

et al. 2021

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The liquid deposition of thin films requires a thorough understanding of the underlying drying process, as it is an essential subprocess, where many defects may arise. To complement experimental studies, the present study uses a laser Michelson interferometer to visualize the vapor cloud of evaporating liquid films. The recorded interferometric patterns are evaluated using windowed Fourier filtering and a novel phase-unwrapping algorithm to allow for a robust analysis. Thin solvent stripes of different lengths are combined to yield a quantitative two-dimensional distribution of the solvent vapor concentration along a thin liquid stripe. The results show a considerable influence of natural convection during evaporation.

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Section: Resultsmentioning

confidence: 99%

Interferometric Imaging of Solvent Vapor of Evaporating Liquid Films

et al. 2021

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“…Equation ( 4) is the boundary condition at x = 0, and this boundary is considered to be insulated. Equation ( 5) is the boundary condition at x = L, and it is considered as heat convection with heat transfer coefficient h. The heat transfer coefficient can be calculated using the correlation expressed in equation ( 6), proposed by Samie [17].…”

Section: Numerical Analysismentioning

confidence: 99%

Fabrication of thin inorganic temperature-sensitive paint using ball milling and its temporal response delay

Jung,

Saito,

Someya

et al. 2024

Meas. Sci. Technol.

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Temperature-sensitive paint (TSP) is widely used to measure the temperature distribution. A TSP is advantageous in terms of cost and spatiotemporal resolution. However, regardless of its thickness, a finite thickness introduces errors. An important issue regarding the thickness of the TSP is the temporal response delay. In this study, a thin TSP was fabricated using ball milling, and TSPs with a thickness < 2 µm could be produced. However, the phosphorescence intensity decreased drastically after ball milling. A special system was designed to measure the temporal response delay caused by the TSP layer. A high-resolution measurement technique (210 kHz and 1.05 µm/pixel) was employed. Time delays were defined and calculated using both experimental and numerical approaches. Numerical simulations were conducted using the experimental data and the thermal properties of ZnO:Zn and epoxy, given that the thermal properties of TSP are unknown. From the time delay, it was found that the thermal diffusivity of the TSP was between those of ZnO:Zn and epoxy, and this result was considered reasonable. Although this study provides only a rough estimation of the thermal diffusivity of TSPs, it reveals a relationship between the time delay and thermal diffusivity, opening up the possibility of calculating the thermal diffusivity from the time delay. Our results can help advance the application of TSPs for temperature measurements in highly dynamic environments.

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“…A numerical and experimental investigation of natural-convection flow above a horizontal plate heated with a constant flux has been reported in [2]. Samie et al [3] analytically analyzed the natural-convection heat transfer below a hot horizontal isothermal flat strip of infinite length. Kozanoglu and Rubio [4] introduced a Nusselt number correlation for the natural-convection from a downward facing horizontal heated plate in which the characteristic length is defined based on the thermal boundary-layer thickness.…”

Section: Introductionmentioning

confidence: 99%

Magnetohydrodynamic free convection of non-Newtonian power-law fluids over a uniformly heated horizontal plate

Bahmani

Kargarsharifabad

2020

THERM SCI

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The MHD free convection flow of non-Newtonian power-law fluids over a horizontal plate subjected to a constant heat flux is studied. The results are presented for various values of the three influential parameters, i. e. the generalized Hartmann number, the generalized Prandtl number, and the non-Newtonian power-law viscosity index. Increasing the Hartmann number increases the thermal boundary-layer thickness and the surface temperature and consequently decreases the wall skin friction and Nusselt number. A lower generalized Prandtl number results in a larger skin friction coefficient and higher wall temperature as well as thicker thermal boundary-layer. The viscosity index is predicted to influence the flow conditions depending on the value of generalized Hartmann number. At high generalized Prandtl number numbers, by decreasing non-Newtonian power-law index, the wall skin friction, temperature scale, and thermal boundary-layer thickness are increased and the Nusselt number is decreased, while the opposite trend is observed for low generalized Prandtl number. A general correlation for the Nusselt number is derived using the numerical results.

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Two-Dimensional Free Convection Heat Transfer Below a Horizontal Hot Isothermal Flat Strip

Cited by 6 publications

References 32 publications

Interferometric Imaging of Solvent Vapor of Evaporating Liquid Films

Interferometric Imaging of Solvent Vapor of Evaporating Liquid Films

Fabrication of thin inorganic temperature-sensitive paint using ball milling and its temporal response delay

Magnetohydrodynamic free convection of non-Newtonian power-law fluids over a uniformly heated horizontal plate

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