Measurement of two-phase flow and heat transfer parameters using infrared thermometry

Kim, Tae Hoon; Kommer, Eric M.; Dessiatoun, Serguei; Kim, Jungho

doi:10.1016/j.ijmultiphaseflow.2011.11.012

Cited by 72 publications

(39 citation statements)

References 19 publications

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“…A cylindrical black body, as described in Kim et al (2012), was used to calibrate the IR readings. Before every experimental run, N 2 was blown through the chamber for a sufficiently long period of time to make sure that this was the only gas present within the test cell.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Evaporation of sessile drops: a three-dimensional approach

Sefiane²,

et al. 2015

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The evaporation of non-axisymmetric sessile drops is studied by means of experiments and three-dimensional (3D) direct numerical simulations. The emergence of azimuthal currents and pairs of counter-rotating vortices in the liquid bulk flow is reported in drops with non-circular contact area. These phenomena, especially the latter which is also observed experimentally, are found to play a critical role in the transient flow dynamics and associated heat transfer. Non-circular drops exhibit variable wettability along the pinned contact-line sensitive to the choice of system parameters, and inversely dependent on the local contact-line curvature, providing a simple criterion for estimating the approximate contact-angle distribution. The evaporation rate is found to vary in the same order of magnitude as the liquid-gas interfacial area. Furthermore, the more complex case of drops evaporating with a moving contact line in the constant contact-angle mode is addressed. Interestingly, the numerical results demonstrate that the average interface temperature remains essentially constant as the drop evaporates in the constant-angle mode, while this increases in the constant-radius mode as the drops becomes thinner. It is therefore concluded that, for increasing substrate heating, the evaporation rate increases more rapidly in the constant-radius mode than in the constant-angle mode. In other words, the higher the temperature the larger the difference between the lifetimes of an evaporating drop in the constant-angle mode with respect to that evaporating in the constant-radius mode.

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Section: Experimental Apparatusmentioning

confidence: 99%

Evaporation of sessile drops: a three-dimensional approach

Sefiane²,

et al. 2015

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“…Heat transfer measurements and flow visualization were obtained using an IR thermometry technique developed by Kim et al [16] that takes advantage of the transparency of silicon in the mid-IR range (3-5 lm). HFE 7100 passed through the 6 mm ID (8 mm OD) single crystal silicon tube which was coated on the inner wall with a 57 lm layer of polyimide tape (k = 0.12 W/m-K) as shown in Fig.…”

Section: Ir Techniquementioning

confidence: 99%

“…The heat flux and heat transfer coefficient were then calculated for every camera pixel along the axial length of the tube. Details of the data reduction procedure can be obtained in Kim et al [16]. To complement the heat transfer measurements, the flow was visualized using a set of six gold-plated mirrors (Fig.…”

Section: Ir Techniquementioning

confidence: 99%

Heat transfer and flow characteristics of rising Taylor bubbles

Scammell

Kim

2015

International Journal of Heat and Mass Transfer

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“…The experimental facility is summarized below and is described in detail by Scammell and Kim [21] and Kim et al [28]. A study of single bubbles was chosen in lieu of bubble trains so flow conditions upstream and downstream of the bubbles could be measured, reducing the complexity in approximating the flow patterns and understanding the heat transfer profile around each bubble.…”

Section: Experimental Apparatusmentioning

confidence: 99%

A study of gravitational effects on single elongated vapor bubbles

Scammell

Kim

Magnini

et al. 2016

International Journal of Heat and Mass Transfer

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a b s t r a c tAn experimental study was completed on the heat transfer induced by a single elongated vapor bubble rising in vertical, upward, co-current flow at various accelerations. The bubble shape and behavior were also studied under those conditions. Tests were conducted using a flow boiling rig which coupled flow visualization with measurements of the heat transfer and liquid film thickness. The bubble drift velocity was shown to dictate the bubble shape as well as the relative influences of thin film evaporation and turbulent wake heat transfer. When present, vortices shed behind the bubble tail created peaks in the heat transfer coefficient whose magnitude decreased with increasing liquid Reynolds number and acceleration. The vortex frequency was found to be linearly dependent on plunging velocity. A criteria for vortex incipience was proposed.

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Measurement of two-phase flow and heat transfer parameters using infrared thermometry

Cited by 72 publications

References 19 publications

Evaporation of sessile drops: a three-dimensional approach

Evaporation of sessile drops: a three-dimensional approach

Heat transfer and flow characteristics of rising Taylor bubbles

A study of gravitational effects on single elongated vapor bubbles

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