Research Papers: Evaporation, Boiling, and Condensation

Fundamental Roles of Nonevaporating Film and Ultrahigh Heat Flux Associated With Nanoscale Meniscus Evaporation in Nucleate Boiling

[+] Author and Article Information
Shalabh C. Maroo

Department of Mechanical and Aerospace Engineering,
Syracuse University,
Syracuse, NY 13244
e-mail: scmaroo@syr.edu

J. N. Chung

Department of Mechanical and Aerospace Engineering,
University of Florida,
Gainesville, FL 32611
e-mail: jnchung@ufl.edu

1Corresponding author.

Manuscript received October 8, 2012; final manuscript received January 17, 2013; published online May 16, 2013. Assoc. Editor: Leslie Phinney.

J. Heat Transfer 135(6), 061501 (May 16, 2013) (10 pages) Paper No: HT-12-1550; doi: 10.1115/1.4023575 History: Received October 08, 2012; Revised January 17, 2013

The three-phase moving contact line present at the base of a bubble in nucleate boiling has been a widely researched topic over the past few decades. It has been traditionally divided into three regions: nonevaporating film (order of nanometers), evaporating film (order of microns), and bulk meniscus (order of millimeters). This multiscale nature of the contact line has made it a challenging and complex problem, and led to an incomplete understanding of its dynamic behavior. The evaporating film and bulk meniscus regions have been investigated rigorously through analytical, numerical and experimental means; however, studies focused on the nonevaporating film region have been very sparse. The nanometer length scale and the fluidic nature of the nonevaporating film has limited the applicability of experimental techniques, while its numerical analysis has been questionable due to the presumed continuum behavior and lack of known input parameters, such as the Hamaker constant. Thus in order to gain fundamental insights and understanding, we have used molecular dynamics simulations to study the formation and characteristics of the nonevaporating film for the first time in published literature, and outlined a technique to obtain Hamaker constants from such simulations. Further, in this review, we have shown that the nonevaporating film can exist in a metastable state of reduced/negative liquid pressures. We have also performed molecular simulations of nanoscale meniscus evaporation, and shown that the associated ultrahigh heat flux is comparable to the maximum-achievable kinetic limit of evaporation. Thus, the nonevaporating film and its adjacent nanoscale regions have a significant impact on the overall macroscale dynamics and heat flux behavior of nucleate boiling, and hence should be included in greater details in nucleate boiling simulations and analysis.

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Bertsch, S. S., Groll, E. A., and Garimella, S. V., 2008, “Review and Comparative Analysis of Studies on Saturated Flow Boiling in Small Channels,”Nanoscale Microscale Thermophys. Eng., 12(3), pp. 187–227. [CrossRef]
Kim, J., 2009, “Review of Nucleate Pool Boiling Bubble Heat Transfer Mechanisms,”Int. J. Multiphase Flow, 35(12), pp. 1067–1076. [CrossRef]
Lienhard, J. H., and Witte, L. C., 1985, “An Historical Review of the Hydrodynamic Theory of Boiling,”Rev. Chem. Eng., 3(3–4), pp. 187–280. [CrossRef]
Lu, Y.-W., and Kandlikar, S. G., 2011, “Nanoscale Surface Modification Techniques for Pool Boiling Enhancement—A Critical Review and Future Directions,”Heat Transfer Eng., 32(10), pp. 827–842. [CrossRef]
Pioro, I. L., Rohsenow, W., and Doerffer, S. S., 2004, “Nucleate Pool-Boiling Heat Transfer. I: Review of Parametric Effects of Boiling Surface,”Int. J. Heat Mass Transfer, 47(23), pp. 5033–5044. [CrossRef]
Shoji, M., 2004, “Studies of Boiling Chaos: A Review,”Int. J. Heat Mass Transfer, 47(6–7), pp. 1105–1128. [CrossRef]
Thome, J. R., 2004, “Boiling in Microchannels: A Review of Experiment and Theory,”Int. J. Heat Fluid Flow, 25(2), pp. 128–139. [CrossRef]
Warrier, G. R., and Dhir, V. K., 2006, “Heat Transfer and Wall Heat Flux Partitioning During Subcooled Flow Nucleate Boiling—A Review,”ASME J. Heat Transfer, 128(12), pp. 1243–1256. [CrossRef]
Benselama, A. M., Harmand, S., and Sefiane, K., 2011, “A Perturbation Method for Solving the Micro-Region Heat Transfer Problem,”Phys. Fluids, 23(10), p. 102103. [CrossRef]
Buffone, C., Sefiane, K., and Christy, J. R. E., 2004, “Experimental Investigation of the Hydrodynamics and Stability of an Evaporating Wetting Film Placed in a Temperature Gradient,” Appl. Therm. Eng., 24(8–9), pp. 1157–1170. [CrossRef]
Buffone, C., Sefiane, K., and Easson, W., 2005, “Marangoni-Driven Instabilities of an Evaporating Liquid-Vapor Interface,”Phys. Rev. E, 71(5), p. 056302. [CrossRef]
Dasgupta, S., Kim, I. Y., and Wayner, P. C., 1994, “Use of the Kelvin-Clapeyron Equation to Model an Evaporating Curved Microfilm,”ASME J. Heat Transfer, 116(4), pp. 1007–1015. [CrossRef]
Dhavaleswarapu, H. K., Garimella, S. V., and Murthy, J. Y., 2009, “Microscale Temperature Measurements Near the Triple Line of an Evaporating Thin Liquid Film,”ASME J. Heat Transfer, 131(6), p. 061501. [CrossRef]
Dhavaleswarapu, H. K., Murthy, J. Y., and Garimella, S. V., 2012, “Numerical Investigation of an Evaporating Meniscus in a Channel,”Int. J. Heat Mass Transfer, 55(4), pp. 915–924. [CrossRef]
Du, S.-Y., and Zhao, Y.-H., 2011, “New Boundary Conditions for the Evaporating Thin-Film Model in a Rectangular Micro Channel,”Int. J. Heat Mass Transfer, 54(15–16), pp. 3694–3701. [CrossRef]
Du, S.-Y., and Zhao, Y.-H., 2012, “Numerical Study of Conjugated Heat Transfer in Evaporating Thin-Films Near the Contact Line,”Int. J. Heat Mass Transfer, 55(1–3), pp. 61–68. [CrossRef]
Ha, J. M., and Peterson, G. P., 1996, “The Interline Heat Transfer of Evaporating Thin Films Along a Micro Grooved Surface,”ASME J. Heat Transfer, 118(3), pp. 747–755. [CrossRef]
Kandlikar, S. G., Kuan, W. K., and Mukherjee, A., 2005, “Experimental Study of Heat Transfer in an Evaporating Meniscus on a Moving Heated Surface,”ASME J. Heat Transfer, 127(3), pp. 244–252. [CrossRef]
Kim, I. Y., and Wayner, P. C., 1996, “Shape of an Evaporating Completely Wetting Extended Meniscus,”J. Thermophys. Heat Transfer, 10(2), pp. 320–325. [CrossRef]
Kou, Z. H., and Bai, M. L., 2011, “Effects of Wall Slip and Temperature Jump on Heat and Mass Transfer Characteristics of an Evaporating Thin Film,”Int. Commun. Heat Mass Transfer, 38(7), pp. 874–878. [CrossRef]
Kundu, P. K., Chakraborty, S., and Dasgupta, S., 2011, “Experimental Investigation of Enhanced Spreading and Cooling From a Microgrooved Surface,”Microfluidics Nanofluidics, 11(4), pp. 489–499. [CrossRef]
Ma, H. B., Cheng, P., Borgmeyer, B., and Wang, Y. X., 2008, “Fluid Flow and Heat Transfer in the Evaporating Thin Film Region,”Microfluidics Nanofluidics, 4(3), pp. 237–243. [CrossRef]
Migliaccio, C. P., Dhavaleswarapu, H. K., and Garimella, S. V., 2011, “Temperature Measurements Near the Contact Line of an Evaporating Meniscus V-Groove,”Int. J. Heat Mass Transfer, 54(7–8), pp. 1520–1526. [CrossRef]
Morris, S. J. S., 2004, “Heat Flow Near the Triple Junction of an Evaporating Meniscus and a Substrate,”Proc. R. Soc. London, Ser. A, 460(2049), pp. 2487–2503. [CrossRef]
Mukherjee, A., 2009, “Contribution of Thin-Film Evaporation During Flow Boiling Inside Microchannels,”Int. J. Thermal Sci., 48(11), pp. 2025–2035. [CrossRef]
Panchamgam, S. S., Chatterjee, A., Plawsky, J. L., and Wayner, P. C., Jr., 2008, “Comprehensive Experimental and Theoretical Study of Fluid Flow and Heat Transfer in a Microscopic Evaporating Meniscus in a Miniature Heat Exchanger,”Int. J. Heat Mass Transfer, 51(21–22), pp. 5368–5379. [CrossRef]
Panchamgam, S. S., Plawsky, J. L., and Wayner, P. C., Jr., 2006, “Microscale Heat Transfer in an Evaporating Moving Extended Meniscus,”Exp. Therm. Fluid Sci., 30(8), pp. 745–754. [CrossRef]
Park, K., and Lee, K. S., 2003, “Flow and Heat Transfer Characteristics of the Evaporating Extended Meniscus in a Micro-Capillary Channel,”Int. J. Heat Mass Transfer, 46(24), pp. 4587–4594. [CrossRef]
Plawsky, J. L., Panchamgam, S. S., Gokhale, S. J., Wayner, P. C., and Dasgupta, S., 2004, “A Study of the Oscillating Corner Meniscus in a Vertical Constrained Vapor Bubble System,”Superlattices Microstruct., 35(3–6), pp. 559–572. [CrossRef]
Pratt, D. M., Brown, J. R., and Hallinan, K. P., 1998, “Thermocapillary Effects on the Stability of a Heated, Curved Meniscus,”ASME J. Heat Transfer, 120(1), pp. 220–226. [CrossRef]
Ranjan, R., Murthy, J. Y., and Garimella, S. V., 2011, “A Microscale Model for Thin-Film Evaporation in Capillary Wick Structures,”Int. J. Heat Mass Transfer, 54(1–3), pp. 169–179. [CrossRef]
Wang, H., Garimella, S. V., and Murthy, J. Y., 2007, “Characteristics of an Evaporating Thin Film in a Microchannel,”Int, J, Heat Mass Transfer, 50(19–20), pp. 3933–3942. [CrossRef]
Wang, H., Garimella, S. V., and Murthy, J. Y., 2008, “An Analytical Solution for the Total Heat Transfer in the Thin-Film Region of an Evaporating Meniscus,”Int. J. Heat Mass Transfer, 51(25–26), pp. 6317–6322. [CrossRef]
Wang, H., Pan, Z., and Garimella, S. V., 2011, “Numerical Investigation of Heat and Mass Transfer From an Evaporating Meniscus in a Heated Open Groove,”Int. J. Heat Mass Transfer, 54(13–14), pp. 3015–3023. [CrossRef]
Zhao, J.-J., Duan, Y.-Y., Wang, X.-D., and Wang, B.-X., 2011, “Effect of Nanofluids on Thin Film Evaporation in Microchannels,”J. Nanopart. Res., 13(10), pp. 5033–5047. [CrossRef]
Ahn, H. S., Jo, H. J., Kang, S. H., and Kim, M. H., 2011, “Effect of Liquid Spreading Due to Nano/Microstructures on the Critical Heat Flux During Pool Boiling,”Appl. Phys. Lett., 98(7), p. 071908. [CrossRef]
Chen, R., Lu, M.-C., Srinivasan, V., Wang, Z., Cho, H. H., and Majumdar, A., 2009, “Nanowires for Enhanced Boiling Heat Transfer,”Nano Lett., 9(2), pp. 548–553. [CrossRef] [PubMed]
Dhir, V. K., 1998, “Boiling Heat Transfer,”Ann. Rev. Fluid Mech., 30, pp. 365–401. [CrossRef]
Forrest, E., Williamson, E., Buongiorno, J., Hu, L.-W., Rubner, M., and Cohen, R., 2010, “Augmentation of Nucleate Boiling Heat Transfer and Critical Heat Flux Using Nanoparticle Thin-Film Coatings,”Int. J. Heat Mass Transfer, 53(1–3), pp. 58–67. [CrossRef]
Kim, S., Kim, H. D., Kim, H., Ahn, H. S., Jo, H., Kim, J., and Kim, M. H., 2010, “Effects of Nano-Fluid and Surfaces With Nano Structure on the Increase of CHF,”Exp. Therm. Fluid Science, 34(4), pp. 487–495. [CrossRef]
Kim, S. J., Bang, I. C., Buongiorno, J., and Hu, L. W., 2007, “Surface Wettability Change During Pool Boiling of Nanofluids and Its Effect on Critical Heat Flux,”Int. J. Heat Mass Transfer, 50(19–20), pp. 4105–4116. [CrossRef]
Li, C., Wang, Z., Wang, P.-I., Peles, Y., Koratkar, N., and Peterson, G. P., 2008, “Nanostructured Copper Interfaces for Enhanced Boiling,”Small, 4(8), pp. 1084–1088. [CrossRef] [PubMed]
Liter, S. G., and Kaviany, M., 2001, “Pool-Boiling CHF Enhancement by Modulated Porous-Layer Coating: Theory and Experiment,”Int. J. Heat Mass Transfer, 44(22), pp. 4287–4311. [CrossRef]
Lu, M.-C., Chen, R., Srinivasan, V., Carey, V. P., and Majumdar, A., 2011, “Critical Heat Flux of Pool Boiling on Si Nanowire Array-Coated Surfaces,”Int. J. Heat Mass Transfer, 54(25–26), pp. 5359–5367. [CrossRef]
Betz, A. R., Xu, J., Qiu, H. H., and Attinger, D., 2010, “Do Surfaces With Mixed Hydrophilic and Hydrophobic Areas Enhance Pool Boiling?,”Appl. Phys. Lett., 97(14), p. 141909. [CrossRef]
Chu, K. H., Enright, R., and Wang, E. N., 2012, “Structured Surfaces for Enhanced Pool Boiling Heat Transfer,”Appl. Phys. Lett., 100(24), p. 241603. [CrossRef]
Gambill, W. R., and Lienhard, J. H., 1989, “An Upper Bound for the Critical Boiling Heat Flux,”ASME J. Heat Transfer, 111(3), pp. 815–818. [CrossRef]
Fisher, J. C., 1948, “The Fracture of Liquids,”J. Appl. Phys., 19(11), pp. 1062–1067. [CrossRef]
Carey, V. P., 1992, Liquid-Vapor Phase-Change Phenomena, Taylor & Francis, London.
Wayner, P. C., 1999, “Intermolecular Forces in Phase-Change Heat Transfer: 1998 Kern Award Review,”AIChE J., 45(10), pp. 2055–2068. [CrossRef]
Chatterjee, A., Plawsky, J. L., and Wayner, P. C., Jr., 2011, “Disjoining Pressure and Capillarity in the Constrained Vapor Bubble Heat Transfer System,” Adv. Colloid Interface Sci., 168(1–2), pp. 40–49. [CrossRef] [PubMed]
Stoddard, S. D., and Ford, J., 1973, “Numerical Experiments on the Stochastic Behavior of a Lennard-Jones Gas System,”Phys. Rev. A, 8(3), pp. 1504–1512. [CrossRef]
Allen, M. P., and Tildesley, D. J., 1987, Computer Simulation of Liquids, Claredon, Oxford, UK.
Rapaport, D. C., 2004, The Art of Molecular Dynamics Simulation, Cambridge University, Cambridge, England.
Sadus, R. J., 1999, Molecular Simulation of Fluids, Elsevier, Netherlands.
Weng, J.-G., Park, S., Lukes, J. R., and Tien, C.-L., 2000, “Molecular Dynamics Investigation of Thickness Effect on Liquid Films,”J. Chem. Phys., 113(14), pp. 5917–5923. [CrossRef]
Maroo, S. C., and Chung, J. N., 2009, “Nanoscale Liquid-Vapor Phase-Change Physics in Nonevaporating Region at the Three-Phase Contact Line,”J. Appl. Phys., 106(6), p. 064911. [CrossRef]
Maroo, S. C., and Chung, J. N., 2008, “Molecular Dynamic Simulation of Platinum Heater and Associated Nano-Scale Liquid Argon Film Evaporation and Colloidal Adsorption Characteristics,”J. Colloid Interface Sci., 328(1), pp. 134–146. [CrossRef] [PubMed]
Abraham, F. F., 1978, “Interfacial Density Profile of a Lennard-Jones Fluid in Contact With a (100) Lennard-Jones Wall and Its Relationship to Idealized Fluid-Wall Systems: A Monte Carlo Simulation,” J. Chem. Phys., 68(8), pp. 3713–3716. [CrossRef]
Drazer, G., Khusid, B., Koplik, J., and Acrivos, A., 2005, “Wetting and Particle Adsorption in Nanoflows,”Phys. Fluids, 17(1), p. 017102. [CrossRef]
Koplik, J., Banavar, J. R., and Willemsen, J. F., 1989, “Molecular-Dynamics of Fluid-Flow at Solid-Surfaces,”Phys. Fluids, 1(5), pp. 781–794. [CrossRef]
Markvoort, A. J., Hilbers, P. A. J., and Nedea, S. V., 2005, “Molecular Dynamics Study of the Influence of Wall-Gas Interactions on Heat Flow in Nanochannels,”Phys. Rev. E, 71(6), p. 066702. [CrossRef]
Nagayama, G., and Cheng, P., 2004, “Effects of Interface Wettability on Microscale Flow by Molecular Dynamics Simulation,”Int. J. Heat Mass Transfer, 47(3), pp. 501–513. [CrossRef]
Ohara, T., and Suzuki, D., 2000, “Intermolecular Energy Transfer at a Solid-Liquid Interface,”Microscale Thermophys. Eng., 4(3), pp. 189–196. [CrossRef]
Priezjev, N. V., 2007, “Rate-Dependent Slip Boundary Conditions for Simple Fluids,”Phys. Rev. E, 75(5), p. 051605. [CrossRef]
Spijker, P., ten Eikelder, H. M. M., Markvoort, A. J., Nedea, S. V., and Hilbers, P. A. J., 2008, “Implicit Particle Wall Boundary Condition in Molecular Dynamics,” Proc. Inst. Mech. Eng., Part C: Mech. Eng. Sci., 222(5), pp. 855–864. [CrossRef]
Thompson, P. A., and Troian, S. M., 1997, “A General Boundary Condition for Liquid Flow at Solid Surfaces,”Nature, 389(6649), pp. 360–362. [CrossRef]
Voronov, R. S., Papavassiliou, D. V., and Lee, L. L., 2006, “Boundary Slip and Wetting Properties of Interfaces: Correlation of the Contact Angle With the Slip Length,”J. Chem. Phys., 124(20), p. 204701. [CrossRef]
Wemhoff, A. P., and Carey, V. P., 2005, “Molecular Dynamics Exploration of Thin Liquid Films on Solid Surfaces. 1. Monatomic Fluid Films,”Microscale Thermophys. Eng., 9(4), pp. 331–349. [CrossRef]
Xu, J., and Li, Y., 2007, “Boundary Conditions at the Solid-Liquid Surface Over the Multiscale Channel Size From Nanometer to Micron,”Int. J. Heat Mass Transfer, 50(13–14), pp. 2571–2581. [CrossRef]
Xu, J. L., and Zhou, Z. Q., 2004, “Molecular Dynamics Simulation of Liquid Argon Flow at Platinum Surfaces,”J. Heat Mass Transfer, 40(11), pp. 859–869. [CrossRef]
Yang, S. C., 2006, “Effects of Surface Roughness and Interface Wettability on Nanoscale Flow in a Nanochannel,”Microfluidics Nanofluidics, 2(6), pp. 501–511. [CrossRef]
Yi, P., Poulikakos, D., Walther, J., and Yadigaroglu, G., 2002, “Molecular Dynamics Simulation of Vaporization of an Ultra-Thin Liquid Argon Layer on a Surface,”Int. J. Heat Mass Transfer, 45(10), pp. 2087–2100. [CrossRef]
Ziarani, A. S., and Mohamad, A. A., 2008, “Effect of Wall Roughness on the Slip of Fluid in a Microchannel,”Nanoscale Microscale Thermophys. Eng., 12(2), pp. 154–169. [CrossRef]
Maroo, S., and Chung, J., 2010, “A Novel Fluid–Wall Heat Transfer Model for Molecular Dynamics Simulations,”J. Nanoparticle Res., 12(5), pp. 1913–1924. [CrossRef]
Wu, Y. W., and Pan, C., 2006, “Molecular Dynamics Simulation of Thin Film Evaporation of Lennard-Jones Liquid,”Nanoscale Microscale Thermophys. Eng., 10(2), pp. 157–170. [CrossRef]
Butt, H.-J., Cappella, B., and Kappl, M., 2005, “Force Measurements With the Atomic Force Microscope: Technique, Interpretation and Applications,”Surf. Sci. Rep., 59(1–6), pp. 1–152. [CrossRef]
Israelachvilli, J., 1994, Intermolecular & Surface Forces, Academic, New York.
Puli, U., and Anil Kumar, R., 2012, “Parametric Effect of Pressure on Bubble Size Distribution in Subcooled Flow Boiling of Water in a Horizontal Annulus,”Exp. Thermal Fluid Sci., 37, pp. 164–170. [CrossRef]
Maroo, S. C., and Chung, J. N., 2010, “Heat Transfer Characteristics and Pressure Variation in a Nanoscale Evaporating Meniscus,”Int, J. Heat and Mass Transfer, 53(15–16), pp. 3335–3345. [CrossRef]
Angell, C. A., 1988, “Approaching the Limits,”Nature, 331, pp. 206–207. [CrossRef]
Briggs, L. J., 1955, “Maximum Superheating of Water as a Measure of Negative Pressure,”J. Appl. Phys., 26(8), pp. 1001–1003. [CrossRef]
Kohonen, M. M., and Christenson, H. K., 2000, “Capillary Condensation of Water Between Rinsed Mica Surfaces,”Langmuir, 16, pp. 7285–7288. [CrossRef]
Nosonovsky, M., and Bhushan, B., 2008, “Phase Behavior of Capillary Bridges: Towards Nanoscale Water Phase Diagram,”Phys. Chem. Chem. Phys., 10(16), pp. 2137–2144. [CrossRef] [PubMed]
Tas, N. R., Mela, P., Kramer, T., Berenschot, J. W., and Van Den Berg, A., 2003, “Capillarity Induced Negative Pressure of Water Plugs in Nanochannels,”Nano. Lett., 3(11), pp. 1537–1540. [CrossRef]
Tyree, M. T., 2003, “Plant Hydraulics: The Ascent of Water,”Nature, 423, p. 923. [CrossRef] [PubMed]
Yang, S. H., Nosonovsky, M., Zhang, H., and Chung, K. H., 2008, “Nanoscale Water Capillary Bridges Under Deeply Negative Pressure,”Chem. Phys. Lett., 451(1–3), pp. 88–92. [CrossRef]
Zhang, R., Ikoma, Y., and Motooka, T., 2010, “Negative Capillary-Pressure-Induced Cavitation Probability in Nanochannels,”Nanotechnology, 21(10), p. 105706. [CrossRef] [PubMed]
Carey, V. P., and Wemhoff, A. P., 2006, “Disjoining Pressure Effects in Ultra-Thin Liquid Films in Micropassages—Comparison of Thermodynamic Theory With Predictions of Molecular Dynamics Simulations,”ASME J. Heat Transfer, 128(12), pp. 1276–1284. [CrossRef]
Maroo, S., and Chung, J. N., 2011, “Negative Pressure Characteristics of an Evaporating Meniscus at Nanoscale,”Nanoscale Res. Lett., 6(1), p. 72. [CrossRef] [PubMed]
Moore, F. D., and Mesler, R. B., 1961, “The Measurement of Rapid Surface Temperature Fluctuations During Nucleate Boiling of Water,”AIChE J., 7(4), pp. 620–624. [CrossRef]
Kunkelmann, C., Ibrahem, K., Schweizer, N., Herbert, S., Stephan, P., and Gambaryan-Roisman, T., 2012, “The Effect of Three-Phase Contact Line Speed on Local Evaporative Heat Transfer: Experimental and Numerical Investigations,”Int. J. Heat Mass Transfer, 55(7–8), pp. 1896–1904. [CrossRef]
Maroo, S. C., and Chung, J. N., 2010, “Effect of Nano-Structured Surface on Meniscus Evaporation at Nanoscale,” ASME Conf. Proc., Washington, DC, Aug. 8–13, Vol. 3, pp. 877–883. [CrossRef]


Grahic Jump Location
Fig. 1

Schematic of bubble growth, (a) overall picture at macroscale (shaded region depicts the nonevaporating film region), and (b) zoomed in nano- and microscale regions at the three-phase contact line

Grahic Jump Location
Fig. 2

Constant wall-temperature boundary condition [75]

Grahic Jump Location
Fig. 3

Evaporation sequence of liquid film of argon on Pt wall in the Y-Z plane along the computational domain. The liquid film does not completely evaporate and a nonevaporating film is obtained [58].

Grahic Jump Location
Fig. 4

(a) 3D view of MD simulation domain of thin liquid argon films in a nanochannel. Vapor pressure-density plot of initial and final states for (b) varying nanochannel height, and (c) varying film thickness. Initial and final vapor states lie on the saturation curve [57].

Grahic Jump Location
Fig. 5

Simultaneous evaporation of argon thin film on nanochannel upper wall with condensation on the lower wall. (a) Variation of the vapor pressure with time, and (b) snapshots of the domain at different time steps. Nonevaporating film does not form on the upper wall since the vapor pressure reduces due to vapor condensation [57].

Grahic Jump Location
Fig. 6

Liquid argon meniscus, surrounded by argon vapor, in an opening constructed of platinum wall atoms. (a) 3D view of the simulation domain where the liquid-vapor interface can be clearly noticeable, and (a) 2D view along the x-z plane depicting the boundary conditions and dimensions. Heat is transferred to the meniscus from the platinum wall region shown in red, while the region shown in blue is maintained at the lower initial temperature [80].

Grahic Jump Location
Fig. 7

Snapshots of x-z plane at different time steps of evaporating nanoscale meniscus. Nonevaporating film is obtained at the center of the meniscus, while the interline region is present in the adjacent regions [80].

Grahic Jump Location
Fig. 8

(a) Average heat and evaporation flux along the length of the nanoscale meniscus [80], and (b) comparison of the average heat flux obtained from MD simulations [80] with that of the maximum theoretical possible heat flux

Grahic Jump Location
Fig. 9

Variation in liquid pressure along the meniscus at t = 2500 ps for the nanoscale meniscus. High negative pressure values are seen at the center of the meniscus. A normalized function log(Π/δne) is plotted in the region of negative liquid pressure for Π=RC=-2γ/PL and Π=δ(x), which nullifies the possibility of cavitation in this region as the meniscus thickness is smaller than the critical cavitation radius [90].

Grahic Jump Location
Fig. 10

Heat flux distribution along the nano- and microlayers at the base of the bubble [80]

Grahic Jump Location
Fig. 11

Meniscus evaporation on a surface with nanostructured ridges can possibly rupture the nonevaporating film and lead to enhancement in nucleate boiling heat transfer [93]




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