Experimental study of pool temperature effects on nucleate pool boiling

Kim, Jeongbae; Oh, Byung Do; Kim, Moo Hwan

doi:10.1016/j.ijmultiphaseflow.2005.09.005

Cited by 36 publications

(22 citation statements)

References 21 publications

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“…The sole difference between the reported data sets was a slightly different wall heat flux (60 kW m in Gerardi et al 2010). Considering the analysis by Kim et al (2006), one would expect a higher degree of subcooling for the 50 kW m −2 data set. This could well be the case, since their pool boiling set-up did not include a pressure gauge and was completely sealed, which can easily lead to higher system pressures.…”

Section: Overview Of Heat Transfer Mechanisms Proposed In Boilingmentioning

confidence: 97%

“…However, some significant variations exist in the reported values. In this respect, the research by Kim et al (2006) is interesting. They analysed the ratio for various degrees of subcooling.…”

Section: Overview Of Heat Transfer Mechanisms Proposed In Boilingmentioning

confidence: 99%

“…In a constant wall temperature boundary condition, the heat flux greatly increases when a bubble grows on the substrate, in order to keep the wall temperature constant. Lee et al (2003) <50 % R11 Constant T wall Demiray & Kim (2004) <12.5 % FC-72 Constant T wall Liao, Mei & Klausner (2004) a <30 % -- Myers et al (2005) 23 % FC-72 Constant heat flux Kim, Oh & Kim (2006) 44-360 % b R113 Constant T wall Wagner & Stephan (2009) 22 % FC-84/3284 Constant heat flux Moghaddam & Kiger (2009a) 16-29 % FC-72 Constant heat flux Gerardi et al (2009) ∼50-65 % Deionized water Constant heat flux Gerardi et al (2010) ∼100-115 % Deionized water Constant heat flux From these results, it appears that roughly 25 % of the heat required for bubble growth is accounted for by heat extracted from the wall. It also seems that the application of a constant wall temperature condition or constant heat flux condition yields roughly the same results.…”

Section: Overview Of Heat Transfer Mechanisms Proposed In Boilingmentioning

confidence: 99%

“…When a sideview image of the vapour bubbles is available, the main method of determining the volume is by fitting a circle through the bubble contour. Studies by Lee et al (2003) and Kim et al (2006) calculated the volume by fitting two spherical caps through the top and the bottom of the bubble. However, this method is still very inaccurate, especially towards bubble detachment during necking of the bubble near the wall.…”

Section: Overview Of Heat Transfer Mechanisms Proposed In Boilingmentioning

confidence: 99%

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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: Overview Of Heat Transfer Mechanisms Proposed In Boilingmentioning

confidence: 97%

Section: Overview Of Heat Transfer Mechanisms Proposed In Boilingmentioning

confidence: 99%

Section: Overview Of Heat Transfer Mechanisms Proposed In Boilingmentioning

confidence: 99%

Section: Overview Of Heat Transfer Mechanisms Proposed In Boilingmentioning

confidence: 99%

See 2 more Smart Citations

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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show abstract

“…In many previous studies using direct measurements from high-speed movie images, such as those of Wang and Dhir (1993a, b), Pinto, Gorenflo, and Künstler (1996), Lee, et al (2003), and Kim, Oh, and Kim (2006) the bubbles have been relatively isolated from one another. This type of behavior is observed in less wetting fluids, fluids on smooth surfaces, or at low heat fluxes.…”

Section: Introductionmentioning

confidence: 98%