A simultaneous PIV and heat transfer study of bubble interaction with free convection flow

Delauré, Yan; Chan, Victor S. S.; Murray, Darina B.

doi:10.1016/s0894-1777(03)00070-0

Cited by 37 publications

(17 citation statements)

References 2 publications

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“…the wake impacts on the surface and a sharp peak in heat flux is seen in figure 2 (b). The increase can be seen to reach 1100W/m 2 K at its peak which corresponds to 2.4 times the natural convection heat transfer coefficient; this is broadly consistent with the results presented by Delauré et al [2003]. The magnitude of the surface heat transfer decreases sharply from the initial peak but the effects of the bubble are shown to last in excess of 12 seconds.…”

Section: Bubble Enhanced Heat Transfersupporting

confidence: 88%

“…In an earlier study related to the present investigation, Delauré et al [2003] investigated heat transfer enhancement from a vertical heated block due to a single rising ellipsoidal air bubble in water. Digital Particle Image Velocimetry (DPIV) was performed in order to explore the mechanism of wake generation and interaction with the heated surface.…”

Section: Introductionmentioning

confidence: 99%

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Bubble Enhanced Heat Transfer from a Vertical Heated Surface

Donnelly

O’Donovan²,

Murray

2008

J Enh Heat Transf

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A rising bubble in a liquid can greatly enhance heat transfer from heated surfaces by acting like a bluff body, displacing fluid as it moves and via the wake generated by the bubble, increasing the mixing of the liquid. The current research quantifies the effect a single free rising ellipsoidal air bubble has on heat transfer from a vertical heated block immersed in water. By measuring the time varying heat transfer and tracking the bubble dynamics, further understanding of the heat transfer mechanism is achieved. Both the plane in which the bubble oscillates and the proximity of the bubble path are shown to influence the surface heat transfer.

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Section: Bubble Enhanced Heat Transfersupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Bubble Enhanced Heat Transfer from a Vertical Heated Surface

Donnelly

O’Donovan²,

Murray

2008

J Enh Heat Transf

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“…Donnelly et al [21] investigated the effect of a single rising bubble near a heated vertical wall. The study highlighted two important parameters which were found to significantly enhance heat transfer from the surface: path orientation and bluff body interactions due to the proximity from the surface, which is consistent with other studies [18,20,22,23]. Path orientation is linked to the periodic release of vortices [25,26] and these vortices play a key role in convective heat transfer.…”

Section: Introductionsupporting

confidence: 88%

“…The phenomenon of heat transfer enhancement resulting from bubble motion near a wall is well established, with numerous studies being performed over the years [15][16][17][18][19][20][21][22][23][24]. Donnelly et al [21] investigated the effect of a single rising bubble near a heated vertical wall.…”

Section: Introductionmentioning

confidence: 99%

Bubble impingement and the mechanisms of heat transfer

Donoghue

Albadawi

Delauré

et al. 2014

International Journal of Heat and Mass Transfer

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Heat transfer augmentation resulting from the effects of two phase flow can play a significant role in convective cooling applications. To date, the interaction between a rising gas bubble impinging on a heated horizontal surface has received limited attention. Available research has focused on bubble dynamics and the associated heat transfer has not been reported. To address this, this study investigates the effect of a single bubble impinging on a heated horizontal surface. Local and time resolved heat transfer measurements have been performed for a died orifice to surface distance, with a bubble injection orifice of 1 mm in diameter. Synchronized high-speed photography and infrared thermography have been utilized to investigate the path of the bubble and the associated heat transfer.

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“…When they set the angle of the heated surface at 12˚ from the horizontal, they found that not only the bubble's wake but also the micro-layer surrounding the bubble contributed to the local heat transfer rate. Delaure et al [27] investigated the interaction of a single, rising, ellipsoidal air bubble with natural convection from an inclined heated flat surface in water. They used PIV, thermocouples, and a hot film sensor to prove that the zigzagging motion of the bubble affects the local temperature and heat flux at the surface.…”

Section: Introductionmentioning

confidence: 99%

Effect of heated wall inclination on natural convection heat transfer in water with near-wall injection of millimeter-sized bubbles

Kitagawa

Denissenko

Murai

2017

International Journal of Heat and Mass Transfer

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A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription. ABSTRACT Natural convection heat transfer from a heated wall in water with near-wall injection of millimeter-sized bubbles is studied experimentally. Velocity and temperature measurements are conducted in the near-wall region. In the range of the heated wall angles from 0 to 40˚ from the vertical, the heat transfer coefficient increases by up to an order of magnitude with bubble injection. The ratio of the heat transfer coefficient with bubble injection to that without injection increases with the wall inclination angle. Based upon measured liquid temperature distributions and liquid flow velocity profiles, enhancement of heat transfer by bubble injection is explained by two mechanisms. First, wall-parallel transport of cold liquid into the thermal boundary layer is enhanced by the bubbledriven flow. Second, wall-normal mixing of warm liquid and cold liquid occurs, as a result of wall-normal velocity fluctuations of the liquid phase activated by a combination of bubble rising motion, vortex shedding from the bubbles, and unsteady vortices formed within the boundary layer. The unsteady vortices travel along the wall together with the bubbles, primarily contributing to the enhancement of heat transfer at higher wall inclination angles.

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A simultaneous PIV and heat transfer study of bubble interaction with free convection flow

Cited by 37 publications

References 2 publications

Bubble Enhanced Heat Transfer from a Vertical Heated Surface

Bubble Enhanced Heat Transfer from a Vertical Heated Surface

Bubble impingement and the mechanisms of heat transfer

Effect of heated wall inclination on natural convection heat transfer in water with near-wall injection of millimeter-sized bubbles

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