Nucleation site interaction in pool boiling on the artificial surface

Zhang, Lei; Shoji, Masahiro

doi:10.1016/s0017-9310(02)00291-0

Cited by 149 publications

(51 citation statements)

References 10 publications

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“…In order to increase predictability, many researchers employed predefined artificial nucleation sites (Bonjour, Clausse & Lallemand 2000;Shoji & Takagi 2001;Zhang & Shoji 2003;Qi & Klausner 2005;Moghaddam & Kiger 2009a, amongst many others) by creating artificial cavities in the boiling substrate. The shape of these cavities differs between studies, examples are cylindrical, conical, rectangular and even triangular cavities.…”

Section: Artificial Nucleation Site Considerationsmentioning

confidence: 99%

Heat transfer mechanisms of a vapour bubble growing at a wall in saturated upward flow

Baltis

Geld

2015

J. Fluid Mech.

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The aim of this study is to provide a better insight into the heat transfer mechanisms involved in single bubble growth in forced convection. In a set-up with vertical upflow of demineralized water under saturation conditions special bubble generators (BGs) were embedded at various positions in the plane wall. Power to a BG, local mean wall temperature and high-speed camera recordings from two viewing angles were measured synchronously. An accurate contour analysis is applied to reconstruct the instantaneous three-dimensional bubble volume. Interface topology changes of a vapour bubble growing at a plane wall have been found to be dictated by the rapid growth and by fluctuations in pressure, velocity and temperature in the approaching fluid flow. The camera images have shown a clear dry spot under the bubbles on the heater surface. A micro-layer under the bubble is experimentally shown to exist when the bubble pins to the wall surface and is therefore dependent on roughness and homogeneity of the wall. The ratio of heat extracted from the wall to the total heat required for evaporation was found to be around 30 % at most and to be independent of the bulk liquid flow rate and heat provided by the wall. When the bulk liquid is locally superheated this ratio was found to decrease to 20 %. Heat transfer to the bubble is also initially controlled by diffusion and is unaffected by the convection of the bulk liquid.

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Section: Artificial Nucleation Site Considerationsmentioning

confidence: 99%

Heat transfer mechanisms of a vapour bubble growing at a wall in saturated upward flow

Baltis

Geld

2015

J. Fluid Mech.

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“…This type of behavior is observed in less wetting fluids, fluids on smooth surfaces, or at low heat fluxes. In other studies, such as those of Abarajith, et al (2004) and Zhang and Shoji (2003), only groups of two to five interacting bubble sites, isolated from other sites on the surface by design, were observed or simulated for the sake of simplicity and to model the specific types of bubble interactions which might occur on the surface. Bubble nucleation interactions may also occur due to thermal diffusion in a conductive substrate, as shown by Chekanov (1977) and Sultan and Judd (1983), although these authors 4 concluded opposite effects.…”

Section: Introductionmentioning

confidence: 99%

Bubble nucleation characteristics in pool boiling of a wetting liquid on smooth and rough surfaces

McHale

Garimella

2010

International Journal of Multiphase Flow

154

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“…Zhang & Shoji [12] analyzed the interaction of nucleation sites in pool boiling and described three main factors of influence: (1) Hydrodynamic interactions between vapor and liquid, (2) bubble coalescence and (3) thermal conduction in the surface material. The main conclusions from their analysis are that thermal interactions inhibit bubble nucleation and both hydrodynamic interaction and coalescence are promotive.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the thermal interactions of nucleation sites in flow boiling

Baltis

Geld

2014

International Journal of Heat and Mass Transfer

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a b s t r a c tAn experimental setup was designed to perform nucleate boiling experiments in upward saturated flow conditions, in order to investigate the influence of vertically aligned vapor bubble nucleation sites on one another. Experiments were performed by activating two bubble generators, of which the inter-site distance can be varied by steps of 2 mm. Depending on mass flow rate, flow direction and heat fluxes to both bubble generators, nucleation sites have been shown to interact at any nucleation site distance. The results have shown two major trends. The first trend is caused by additional convection (not by bubbles) from the upstream bubble generator, BG2, to the downstream bubble generator, BG1, increasing its nucleation frequency and bubble detachment diameter. The influence of additional convection on bubble frequency and diameter diminishes with increasing inter-site distance, S, and initial bubble nucleation frequency at BG1. The influence of added convective heat is enhanced by increasing the liquid bulk flow rate. The second trend is seen when BG2 initiates its own bubble nucleation. Vapor bubbles that nucleate at BG2 and pass by BG1 in close proximity have an inhibitive effect on bubble nucleation at BG1. The effect of this inhibitive trend diminishes with increasing nucleation frequency at BG1. Because of the significance of the effect of hydrodynamic interaction on the number of active nucleation sites and bubble size at detachment, mechanistic modeling of nucleate flow boiling is expected to benefit from the quantifications presented in this study.

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Nucleation site interaction in pool boiling on the artificial surface

Cited by 149 publications

References 10 publications

Heat transfer mechanisms of a vapour bubble growing at a wall in saturated upward flow

Heat transfer mechanisms of a vapour bubble growing at a wall in saturated upward flow

Bubble nucleation characteristics in pool boiling of a wetting liquid on smooth and rough surfaces

Experimental investigation of the thermal interactions of nucleation sites in flow boiling

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