Skip to main content
×
Home
    • Aa
    • Aa

Vapour-bubble nucleation and dynamics in turbulent Rayleigh–Bénard convection

  • Daniela Narezo Guzman (a1) (a2), Tomasz Frączek (a2), Christopher Reetz (a2), Chao Sun (a1) (a3), Detlef Lohse (a1) (a4) and Guenter Ahlers (a2)...
Abstract

Vapour bubbles nucleating at micro-cavities etched into the silicon bottom plate of a cylindrical Rayleigh–Bénard sample (diameter $D=8.8$  cm, aspect ratio ${\it\Gamma}\equiv D/L\simeq 1.00$ where $L$ is the sample height) were visualized from the top and from the side. A triangular array of cylindrical micro-cavities (with a diameter of $30~{\rm\mu}\text{m}$ and a depth of $100~{\rm\mu}\text{m}$ ) covered a circular centred area (diameter of 2.5 cm) of the bottom plate. Heat was applied to the sample only over this central area while cooling was over the entire top-plate area. Bubble sizes and frequencies of departure from the bottom plate are reported for a range of bottom-plate superheats $T_{b}-T_{on}$ ( $T_{b}$ is the bottom-plate temperature, $T_{on}$ is the onset temperature of bubble nucleation) from 3 to 12 K for three different cavity separations. The difference $T_{b}-T_{t}\simeq 16$  K between $T_{b}$ and the top plate temperature $T_{t}$ was kept fixed while the mean temperature $T_{m}=(T_{b}+T_{t})/2$ was varied, leading to a small range of the Rayleigh number $Ra$ from $1.4\times 10^{10}$ to $2.0\times 10^{10}$ . The time between bubble departures from a given cavity decreased exponentially with increasing superheat and was independent of cavity separation. The contribution of the bubble latent heat to the total enhancement of heat transferred due to bubble nucleation was found to increase with superheat, reaching up to 25 %. The bubbly flow was examined in greater detail for a superheat of 10 K and $Ra\simeq 1.9\times 10^{10}$ . The condensation and/or dissolution rates of departed bubbles revealed two regimes: the initial rate was influenced by steep thermal gradients across the thermal boundary layer near the plate and was two orders of magnitude larger than the final condensation and/or dissolution rate that prevailed once the rising bubbles were in the colder bulk flow of nearly uniform temperature. The dynamics of thermal plumes was studied qualitatively in the presence and absence of nucleating bubbles. It was found that bubbles enhanced the plume velocity by a factor of four or so and drove a large-scale circulation (LSC). Nonetheless, even in the presence of bubbles the plumes and LSC had a characteristic velocity which was smaller by a factor of five or so than the bubble-rise velocity in the bulk. In the absence of bubbles there was strongly turbulent convection but no LSC, and plumes on average rose vertically.

Copyright
Corresponding author
Email address for correspondence: daniela.narezo@gmail.com
Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

G. Ahlers 2009 Turbulent convection. Physics 2, 74, 1–7.

G. Ahlers , E. Bodenschatz , D. Funfschilling , S. Grossmann , X. He , D. Lohse , R. J. A. M. Stevens  & R. Verzicco 2012 Logarithmic temperature profiles in turbulent Rayleigh–Bénard convection. Phys. Rev. Lett. 109, 114501.

G. Ahlers , S. Grossmann  & D. Lohse 2009 Heat transfer and large scale dynamics in Rayleigh–Bénard convection. Rev. Mod. Phys. 81, 503537.

G. Ahlers  & X. Xu 2000 Prandtl-number dependence of heat transport in turbulent Rayleigh–Bénard convection. Phys. Rev. Lett. 86, 33203323.

L. Biferale , P. Perlekar , M. Sbragaglia  & F. Toschi 2012 Convection in multiphase fluid flows using lattice Boltzmann methods. Phys. Rev. Lett. 108, 104502, 15.

E. Brown  & G. Ahlers 2007 Large-scale circulation model of turbulent Rayleigh–Bénard convection. Phys. Rev. Lett. 98, 134501, 14.

E. Brown  & G. Ahlers 2008 A model of diffusion in a potential well for the dynamics of the large-scale circulation in turbulent Rayleigh–Bénard convection. Phys. Fluids 20, 075101, 116.

J. R. de Bruyn , E. Bodenschatz , S. W. Morris , S. Trainoff , Y. Hu , D. S. Cannell  & G. Ahlers 1996 Apparatus for the study of Rayleigh–Bénard convection in gases under pressure. Rev. Sci. Instrum. 67, 2043.

Y. M. Chen  & F. Mayinger 1992 Measurements of heat transfer at the phase interface of condensing bubbles. Intl J. Multiphase Flow 18, 877890.

V. K. Dhir 1998 Boiling heat transfer. Annu. Rev. Fluid Mech. 30, 365401.

H. K. Forster  & N. Zuber 1954 Growth of vapor bubbles in superheated liquid. J. Appl. Phys. 25 (4), 474478.

S. Grossmann  & D. Lohse 2004 Fluctuations in turbulent Rayleigh–Bénard convection: the role of plumes. Phys. Fluids 16, 44624472.

L. P. Kadanoff 2001 Turbulent heat flow: structures and scaling. Phys. Today 54 (8), 3439.

J. Kim 2009 Review of nucleate pool boiling bubble heat transfer mechanism. Intl J. Multiphase Flow 35, 10671076.

R. Lakkaraju , R. J. A. M. Stevens , P. Oresta , R. Verzicco , D. Lohse  & A. Prosperetti 2013 Heat transport in bubbling turbulent convection. Proc. Natl Acad. Sci. USA 110, 92379242.

D. Legendre , J. Borée  & J. Magnaudet 1998 Thermal and dynamic evolution of a spherical bubble moving steadily in a superheated or subcooled liquid. Phys. Fluids 10 (6), 12561272.

D. Lohse  & K.-Q. Xia 2010 Small-scale properties of turbulent Rayleigh–Bénard convection. Annu. Rev. Fluid Mech. 42, 335364.

D. Lohse  & X. Zhang 2015 Surface nanobubble and surface nanodroplets. Rev. Mod. Phys. 87, 9811035.

J. Magnaudet  & I. Eames 2000 The motion of high-Reynolds-number bubbles in imhomogeneous flows. Annu. Rev. Fluid Mech. 32, 659708.

A. D. Okhotsimskii 1988 The thermal regime of vapour bubble collapse at different Jacob numbers. Intl J. Heat Mass Transfer 31, 15691576.

M. S. Plesset  & S. A. Zwick 1954 The growth of vapor bubbles in superheated liquids. J. Appl. Phys. 25, 493500.

S. Rasenat , G. Hartung , B. L. Winkler  & I. Rehberg 1989 The shadowgraph method in convection experiments. Exp. Fluids 7, 412420.

O. Shpak , L. Stricker , M. Versluis  & D. Lohse 2013 The role of gas in ultrasonically driven vapor bubble growth. Phys. Med. Biol. 58, 25232535.

W. M. Sluyter , P. C. Slooten , C. A. Copraji  & A. K. Chesters 1991 The departure size of pool-boiling bubbles from artificial cavities at moderate and high pressures. Intl J. Multiphase Flow 17, 153158.

M. E. Steinke  & S. G. Kandlikar 2004 Control and dissolved air in water during flow boiling in micro channels. Intl J. Heat Mass Transfer 47, 19251935.

S. P. Trainoff  & D. S. Cannel 2002 Physical optics treatment of the shadowgraph. Phys. Fluids 14, 13401363.

J. de Vries , S. Luther  & D. Lohse 2002 Induced bubble shape oscillations and their impact on the rise velocity. Eur. Phys. J. B 29, 503509.

X. Xu , K. M. S. Bajaj  & G. Ahlers 2000 Heat transport in turbulent Rayleigh–Bénard convection. Phys. Rev. Lett. 84 (19), 43574360.

X. Zhang , Z. Lu , H. Tan , L. Bao , Y. He , C. Sun  & D. Lohse 2015 Formation of surface nanodroplets under controlled flow conditions. Proc. Natl Acad. Sci. USA 112, 92539257.

J. Q. Zhong , D. Funfschilling  & G. Ahlers 2009 Enhanced heat transport by turbulent two-phase Rayleigh–Bénard convection. Phys. Rev. Lett. 102, 124501, 14.

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×
MathJax

Keywords:

Type Description Title
VIDEO
Movies

Narezo Guzman et al. supplementary movie
Shadowgraph visualization of two-phase flow capturing the entire cell between bottom to top plates. Movie from which figure 6(a) was extracted. Movie is displayed in real time. The bottom plate superheat was about 10 K and the cavity separation was 0.6 mm.

 Video (663 KB)
663 KB
VIDEO
Movies

Narezo Guzman et al. supplementary movie
Movie from which figure 5(a) was extracted. The movie shows the bubble detachment process from the bottom plate with superheat of about 10 K and a cavity separation of 0.6 mm. The movie was recorded at 500 frames per second and was slowed down 20 times for display.

 Video (6.1 MB)
6.1 MB
VIDEO
Movies

Narezo Guzman et al. supplementary movie
Movie from which figure 8(d) was extracted. The movie shows bubbles detaching from the bottom plate and rising until eventually they fully condense and dissolve. The movie captured the flow between bottom and top plates and was recorded at 500 frames per second and slowed down 20 times for display. The bottom plate superheat was about 10 K and the cavity separation was 0.6 mm.

 Video (1.5 MB)
1.5 MB
VIDEO
Movies

Narezo Guzman et al. supplementary movie
Movie from which figure 5(b) was extracted. The movie shows the detached bubbles rising across 0.4 of the cell height. The bottom plate superheat was about 10 K and the cavity separation was 0.6 mm. The movie was recorded at 1000 frames per second and was slowed down 40 times for display.

 Video (1.2 MB)
1.2 MB
VIDEO
Movies

Narezo Guzman et al. supplementary movie
Shadowgraph visualization of one-phase flow capturing the entire cell between bottom to top plates. Movie from which figure 6(b) was extracted. Movie is displayed in real time. The bottom plate superheat was about 10 K and the cavity separation was 0.6 mm.

 Video (642 KB)
642 KB

Metrics

Full text views

Total number of HTML views: 6
Total number of PDF views: 89 *
Loading metrics...

Abstract views

Total abstract views: 236 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 25th June 2017. This data will be updated every 24 hours.