Dynamics and Heat Transfer Associated With a Single Bubble During Nucleate Boiling on a Horizontal Surface

Son, Gihun; Dhir, Vijay K.; Ramanujapu, N.

doi:10.1115/1.2826025

Cited by 428 publications

(241 citation statements)

References 8 publications

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“…As discussed by Dhir [161],measurement difficulties, prediction inaccuracies, and lack of generality associated with the effort to correlate nucleate boiling mechanisms over the last half of the twentieth century, viz. nucleation site density, bubble departure diameter, and bubble departure frequency, has spurred recent investigation of direct simulation of vapor bubble growth during nucleate boiling from flat surfaces [162][163][164][165][166][167][168][169]. Reports of similar approaches in the presence of porous structures are limited.…”

Section: Boiling In the Wick Structurementioning

confidence: 99%

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Weibel

Garimella

2013

Advances in Heat Transfer

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Owing to their high reliability, simplicity of manufacture, passive operation, and effective heat transport, flat heat pipes and vapor chambers are used extensively in the thermal management of electronic devices. The need for concurrent size, weight, and performance improvements in high-performance electronics systems, without resort to active liquid-cooling strategies, demands passive heat spreading technologies that can dissipate extremely high heat fluxes from small hot spots. In response to these daunting application-driven trends, a number of recent investigations have focused on the design, characterization, and fabrication of ultra-thin vapor chambers for proximate heat spreading away from these hot spots. The predominant transport mechanisms and operational limits have been found to be different under these conditions relative to conventional low-power heat pipes. Noteworthy advances in the fundamental understanding of evaporation and boiling from porous microstructures fed by capillary action, and improvements in vapor chamber characterization, modeling, design, and fabrication techniques are reviewed. Characterization of evaporation and boiling from idealized and realistic wick structures, observation of vapor formation regimes as a function of operating conditions, assessment of fluid dryout limitations, design of novel multi-scale and nanostructured wicks for enhanced transport, and incorporation of these high heat flux transport phenomena into device-level models are discussed. These recent developments have successfully extended the maximum operating heat flux limits of vapor chambers.2

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Section: Boiling In the Wick Structurementioning

confidence: 99%

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Weibel

Garimella

2013

Advances in Heat Transfer

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“…5 Bubble detachment in pool boiling has also been investigated by direct numerical simulation. 6 The present study is based on an alternative to the above-mentioned Newtonian treatment of bubble dynamics. It utilizes Euler-Lagrange equations which have proven to be a convenient approach if a bubble is deforming.…”

Section: -2mentioning

confidence: 99%

Forces on a boiling bubble in a developing boundary layer, in microgravity with g-jitter and in terrestrial conditions

et al. 2012

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International audienceTerrestrial and microgravity flow boiling experiments were carried out with the same test rig, comprising a locally heated artificial cavity in the center of a channel near the frontal edge of an intrusive glass bubble generator. Bubble shapes were in microgravity generally not far from those of truncated spheres,which permitted the computation of inertial lift and drag from potential flow theory for truncated spheres approximating the actual shape. For these bubbles, inertial lift is counteracted by drag and both forces are of the same order of magnitude as g-jitter. A generalization of the Laplace equation is found which applies to a deforming bubble attached to a plane wall and yields the pressure difference between the hydrostatic pressures in the bubble and at the wall, �p. A fully independent way to determine the overpressure p is given by a second Euler-Lagrange equation. Relative differences have been found to be about 5% for both terrestrial and microgravity bubbles. A way is found to determine the sum of the two counteracting major force contributions on a bubble in the direction normal to the wall from a single directly measurable quantity. Good agreement with expectation values for terrestrial bubbles was obtained with the difference in radii of curvature averaged over the liquid-vapor interface, �(1/R2 − 1/R1)�, multiplied with the surface tension coefficient, σ. The new analysis methods of force components presented also permit the accounting for a surface tension gradient along the liquid-vapor interface. No such gradients were found for the present measurements

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“…At the triple contact line, the contact angle is dynamic and differs from the static contact angle which also plays a part in determining the bubble dynamics [34]. In this respect, mechanistic-based or numerical models which oversimplify the bubble geometry, such as assuming a constant apparent contact angle [35,36] or assuming that the bubble remains a section of a sphere [37,38] can, in many instances, not be representative of the actual physical phenomena since the Laplace pressure drop is sensitive to bubble shape [34].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of gas injected bubble growth from submerged orifices

Bari

Robinson

2013

Experimental Thermal and Fluid Science

126

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a b s t r a c tThis work investigates the mechanism of adiabatic gas bubble growth from submerged orifices with the view of elucidating the interdependence of the bubble shape and the pressure field during growth and departure. Air injection flow rates between 10 mlph and 100 mlph have been tested for orifices of diameters 0.58 mm, 1.05 mm and 1.6 mm. The force field around single isolated bubbles during growth and detachment has been investigated experimentally with the aid of high speed photography and detailed image processing and measurement of the internal bubble pressure. Different flow rates have been compared in order to elucidate dynamic effects. Combining measurements of the instantaneous gas pressure, measurements of the local curvature and the Young-Laplace equation has allowed the estimation of the liquid pressure field acting on the gas-liquid interface over the entire bubble surface. These have subsequently been decomposed into constitutive components such as buoyancy, contact pressure, capillary and the dynamic pressure forces.

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Dynamics and Heat Transfer Associated With a Single Bubble During Nucleate Boiling on a Horizontal Surface

Cited by 428 publications

References 8 publications

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Forces on a boiling bubble in a developing boundary layer, in microgravity with g-jitter and in terrestrial conditions

Experimental study of gas injected bubble growth from submerged orifices

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