Marangoni heat transfer in subcooled nucleate pool boiling

Petrovic, Sanja; Robinson, A.J.; Judd, R. L.

doi:10.1016/j.ijheatmasstransfer.2004.05.031

Cited by 68 publications

(51 citation statements)

References 27 publications

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“…The assumption is consistent with the Marangoni heat transfer regime discovered by Petrovic et al [5] where air bubbles caused a noteworthy enhancement in the wall heat transfer even when the heated wall temperature was below the saturation temperature. The work is also qualitatively comparable to the situation of gassaturated liquids, for example, the experimental results of Henry et al [26].…”

Section: Numerical Proceduressupporting

confidence: 90%

“…With regard to bubbles attached to heated surfaces, the results showed notable heat transfer enhancement and, for zero gravity, oscillatory behaviour at high Marangoni numbers (Ma>2.5x10 5 ). Following on from earlier work [3,18,19] Betz and Straub [11] numerically investigated the flow and heat transfer around bubbles attached to a heated wall in a cavity.…”

Section: Introductionmentioning

confidence: 95%

“…Before this, however, Petrovic et al [5] used the same correlation to predict the heat transfer rate from an upward facing surface with several gas bubbles attached to it. In these experiments, a Marangonidominated heat transfer regime was discovered to exist between natural convection and subcooled nucleate boiling.…”

Section: Bhunia and Kamotani [Ref] Numerically Investigated 2dmentioning

confidence: 99%

“…The surface tension variation with temperature induces a stress imbalance which is equalized by causing local fluid motion and subsequent sheer stress. For the situation of a bubble attached to a heated wall, thermocapillary convection can cause notable enhancement of the wall heat transfer both in microgravity [1,2] and at terrestrial gravity [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Heat transfer near an isolated hemispherical gas bubble: The combined influence of thermocapillarity and buoyancy

O’Shaughnessy

Robinson

2013

International Journal of Heat and Mass Transfer

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Thermal Marangoni convection about a 1 mm radius hemispherical air bubble attached to a heated wall immersed in a silicone oil layer of constant depth of 5 mm was numerically investigated. Tests were performed for a range of Marangoni numbers (145≤Ma≤915) with varying levels of gravitational acceleration between zero gravity and earth gravity in order to quantify the rates of heat transfer. For the zero gravity condition, a thermocapillary-driven vortex develops around the bubble extending the entire height of the channel. This flow structure causes a jet-like flow of heated liquid to emanate from the bubble tip which impinged on the cold wall. With the addition of gravity, a counter rotating secondary buoyancydriven vortex forms which reduces the size of the thermocapillary vortex and disrupts the jet flow from the bubble tip. The wall heat flux profiles indicate that under zero gravity, the peak heat fluxes increase monotonically with Ma with an area of influence that increases asymptotically with Ma. Likewise, under gravity conditions the peak heat flux also increases with Ma and for low Ma is higher than that of 0-g. However, the area of influence is considerably smaller and not sensitive to Ma or the level of gravity. Experimental validation of selected terrestrial gravity numerical results was obtained using particle image velocimetry (PIV) for low to moderate Marangoni numbers. For all experiments, steadystate Marangoni convection was observed. The experimental flow patterns showed good agreement with the numerical solutions.

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Section: Numerical Proceduressupporting

confidence: 90%

Section: Introductionmentioning

confidence: 95%

Section: Bhunia and Kamotani [Ref] Numerically Investigated 2dmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Heat transfer near an isolated hemispherical gas bubble: The combined influence of thermocapillarity and buoyancy

O’Shaughnessy

Robinson

2013

International Journal of Heat and Mass Transfer

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“…As detailed in [26], the uncertainty in the heat flux measurement was determined to be ±4.1%. The surface temperature (T s ) was determined by linear extrapolation of the centreline temperature distribution to the surface,…”

Section: Data Reductionmentioning

confidence: 99%

Nozzle geometry effects in liquid jet array impingement

Whelan

Robinson

2009

Applied Thermal Engineering

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The use of impinging liquid jets in electronics thermal management is attracting some consideration due to their very high heat transfer coefficients, hot spot targeting capabilities and moderate hydraulic power requirements. In this investigation an experimental study of the cooling capabilities of impinging water jet arrays is presented. Of particular interest here is the influence that the inlet and outlet geometries have on the thermal-hydraulics of jet impingement heat transfer with the aim of determining practical configurations in which heat transfer to the impinging jets is increased and/or the hydraulic pumping power is decreased. For a square array of 45 jets of fixed 1.0 mm diameter and fixed interjet spacing of 5 mm, six different nozzle geometries were investigated. The arrays impinged normally upon a heated circular copper surface of 31.5 mm diameter for a nominal heat flux of 25.66 W/cm2. Each array was tested under confined-submerged flow conditions with a constant jet-to-target spacing of 2.0 mm as well as free-surface conditions with a constant jet-to-target spacing of 20 mm. All nozzles were tested for a Reynolds number range of approximately 800 ≤ Redn ≤ 10000. It has been found that the confined-submerged tests yield greater heat transfer coefficients compared with their free jet counterparts. Chamfering and contouring the nozzle inlets showed significant decrease in the pressure drop across the nozzle plate whilst chamfering and contouring the exit showed moderate gains in the surface averaged heat transfer coefficient. Nozzles that provide the highest heat transfer for a given hydraulic pumping power are identified for each free-surface and confined-submerged scenarios. Chamfering and contouring the nozzle inlets showed significant decrease in the pressure drop across the nozzle plate whilst chamfering and contouring the exit showed moderate gains in the surface averaged heat transfer coefficient. Nozzles that provide the highest heat transfer for a given hydraulic pumping power are identified for each free-surface and confined-submerged scenarios. Nozzle Geometry Effects in Liquid Jet

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Fixation of Thermocouples and Insulation for Heated Block

Vajc

Dostál

2021

Advances in Heat Transfer and Thermal Engineering

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Marangoni heat transfer in subcooled nucleate pool boiling

Cited by 68 publications

References 27 publications

Heat transfer near an isolated hemispherical gas bubble: The combined influence of thermocapillarity and buoyancy

Heat transfer near an isolated hemispherical gas bubble: The combined influence of thermocapillarity and buoyancy

Nozzle geometry effects in liquid jet array impingement

Fixation of Thermocouples and Insulation for Heated Block

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