Local instantaneous heat transfer around a rising single Taylor bubble

Babin, V. P.; Shemer, Lev; Barnea, Dvora

doi:10.1016/j.ijheatmasstransfer.2015.05.103

Cited by 10 publications

(6 citation statements)

References 31 publications

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“…The distance behind the tail at which single-phase heat transfer is re-established (the ''calming length", L c /D) is seen to depend on the liquid Reynolds number and the gravity level. This behavior may be attributed to the redevelopment of the thermal boundary layer in the wake after its disruption by vortices as was shown by Babin et al [20]. For both 1g and 1.8g accelerations, L c /D was smallest at Re l % 800, increased to its largest values at Re l = 1570, then decreased to moderate lengths at Re l = 3058.…”

Section: Heat Transfersupporting

confidence: 53%

“…12 were very near or above this threshold, suggesting their film velocities and wake heat transfer should also be similar. Babin et al [20], on the contrary, found that the magnitude and length of the wake enhancement increased with bubble length for both laminar and turbulent flows. They attributed the trends to two factors.…”

Section: Heat Transfermentioning

confidence: 92%

“…This suggests a higher heat transfer coefficient in the wake than in the liquid film, but no quantitative data was presented. Babin et al [18][19][20] investigated the wake heat transfer enhancement for single air bubbles rising in stagnant and vertically flowing water using a similar IR technique. They observed a rapid rise in heat transfer coefficient just behind the bubble tail that decayed back to the original single-phase value far downstream.…”

Section: Taylor Bubble Heat Transfermentioning

confidence: 99%

“…The bubble length required for a fully developed liquid film was calculated for the conditions of Babin et al [20] to be L b /D % 22 using Campos and Carvalho [9] where the film thickness was approximated using Brown [6]. The bubble lengths 15.…”

Section: Heat Transfermentioning

confidence: 99%

See 3 more Smart Citations

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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Section: Heat Transfersupporting

confidence: 53%

Section: Heat Transfermentioning

confidence: 92%

Section: Taylor Bubble Heat Transfermentioning

confidence: 99%

Section: Heat Transfermentioning

confidence: 99%

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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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“…Decreasing the foil thickness improved the time response considerably. 2 This method was applied in the lab to measure convective heat transfer coefficients in two-phase flow 3,4 and transient phenomena in single phase pipe flow 5 .…”

mentioning

confidence: 99%

Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow

Fershtman

Barnea

Shemer

2018

JoVE

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This manuscript provides step by step description of the manufacturing process of a test section designed to measure the local instantaneous heat transfer coefficient as a function of the liquid flow rate in a transparent pipe. With certain amendments, the approach is extended to gas-liquid flows, with a particular emphasis on the effect of a single elongated (Taylor) air bubble on heat transfer enhancement. A non-invasive thermography technique is applied to measure the instantaneous temperature of a thin metal foil heated electrically. The foil is glued to cover a narrow slot cut in the pipe. The thermal inertia of the foil is small enough to detect the variation in the instantaneous foil temperature. The test section can be moved along the pipe and is long enough to cover a considerable part of the growing thermal boundary layer. At the beginning of each experimental run, a steady state with a constant water flow rate and heat flux to the foil is attained and serves as the reference. The Taylor bubble is then injected into the pipe. The heat transfer coefficient variations due to the passage of a Taylor bubble propagating in a vertical pipe is measured as function of the distance of the measuring point from the bottom of the moving Taylor bubble. Thus, the results represent the local heat transfer coefficients. Multiple independent runs preformed under identical conditions allow accumulating sufficient data to calculate reliable ensemble-averaged results on the transient convective heat transfer. In order to perform this in a frame of reference moving with the bubble, the location of the bubble along the pipe has to be known at all times. Detailed description of measurements of the length and of the translational velocity of the Taylor bubbles by optical probes is presented.

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Local instantaneous heat transfer characteristics around a rising single Taylor bubble and the temperature response of relatively thick pipe wall under local constant heat flux

Guo,

Kong,

et al. 2024

Applied Thermal Engineering

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Local instantaneous heat transfer around a rising single Taylor bubble

Cited by 10 publications

References 31 publications

A study of gravitational effects on single elongated vapor bubbles

A study of gravitational effects on single elongated vapor bubbles

Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow

Local instantaneous heat transfer characteristics around a rising single Taylor bubble and the temperature response of relatively thick pipe wall under local constant heat flux

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