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Keywords: Surface Tension
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Journal Articles
Article Type: Technical Briefs
J. Heat Transfer. September 2013, 135(9): 091602.
Paper No: HT-12-1312
Published Online: July 26, 2013
... be readily found from the laminar annular flow solutions. Significant differences are found between these and values from approximate equations. condensation microchannel surface tension pressure drop refrigerant heat exchanger Two-phase flow in channels, with or without phase change...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. May 2013, 135(5): 051501.
Paper No: HT-12-1053
Published Online: April 9, 2013
...Andrea Dziubek Surface tension due to surface waves: In Sec. 2 , we assumed thermodynamic equilibrium at the interface T ( r = h ) = T s . From the dimension Eq. (50) of this condition, we obtained that tube radius and vapor thickness have the same spatial dimension...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. May 2012, 134(5): 051019.
Published Online: April 13, 2012
... into account surface tension. A uniform interface temperature and a uniform wall temperature have been fixed as boundary conditions. The mass flux is G = 100 kg m −2 s −1 and it has been assumed that the flow is laminar inside the liquid phase while turbulence inside the vapor phase has been handled...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. April 2012, 134(4): 042101.
Published Online: February 16, 2012
... relationship with the strength and properties of the fusion zone. In this work, surface tension coefficient is considered to be negative, indicating an outward surface flow, whereas high Prandtl number represents a reduced thickness of the thermal boundary layer compared to that of the momentum boundary layer...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. March 2012, 134(3): 031005.
Published Online: January 11, 2012
... = coefficient of thermal expansion [1/K] λ = thermal conductivity [W/(m·K)] μ = dynamic viscosity [Pa·s] ν = kinematic viscosity [m 2 /s] ν ¯ = mean kinematic viscosity [m 2 /s] σ = surface tension [N/m] σ T = temperature coefficient of surface tension...
Journal Articles
Article Type: Discussions
J. Heat Transfer. January 2012, 134(1): 015502.
Published Online: November 29, 2011
...Satish G. Kandlikar 19 07 2011 27 07 2011 29 11 2011 29 11 2011 boiling contact angle evaporation heat transfer microchannel flow surface tension The interrelations among different nondimensional groups shown by M. M. Awad are quite correct. The insight...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. January 2012, 134(1): 011502.
Published Online: November 18, 2011
.... The power law coefficient for gravity is a function of wall temperature. As the heater size or gravity level is reduced, a sharp transition in the heat flux is observed at a threshold value of L h /L c = 2.1. Below this threshold value, boiling is surface tension dominated and the dependence on gravity...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. January 2012, 134(1): 011503.
Published Online: November 18, 2011
... area of the tubes, i.e., on the surface area of the parts of the tube and pin surface not covered by condensate retained by surface tension. For all the tubes, vapor-side, heat-transfer enhancements were found to be approximately twice the corresponding active-area enhancements. The best performing pin...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. October 2011, 133(10): 102901.
Published Online: August 15, 2011
... friction multiplier is shown to decrease as channel diameter decreases due to the influence of viscous and surface tension forces. Figure 11 shows how the dimensionless Nusselt number changes with channel diameter. As shown in this figure, the two-phase heat transfer becomes worse than the single-phase...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. October 2011, 133(10): 101501.
Published Online: August 11, 2011
...Ian A. Cosden; Jennifer R. Lukes Molecular dynamics simulations are performed to calculate the surface tension of bubbles formed in a metastable Lennard–Jones (LJ) argon fluid. The calculated normal and transverse pressure components are used to compute a surface tension which is compared...
Journal Articles
Journal Articles
Article Type: Research Papers
J. Heat Transfer. June 2011, 133(6): 061501.
Published Online: March 2, 2011
... organic compounds pipe flow surface tension thin films two-phase flow water ethanol-water vapors Marangoni condensation pseudo-dropwise heat transfer theoretical model It has been known for many years that the condensation of the binary vapor of miscible liquids does not always...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. May 2011, 133(5): 051501.
Published Online: January 31, 2011
... % ( 7.51 wt % ) are investigated and compared with predictions developed for conventional fluids. The thermophysical properties of the nanofluids, including thermal conductivity, kinematic viscosity, and surface tension, are reported, as is the mode transition behavior of the nanofluids. The experimental...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. December 2010, 132(12): 121601.
Published Online: September 20, 2010
...T. W. Dutton; L. R. Pate; D. K. Hollingsworth Surface-tension forces can drive fluid motion within thin liquid layers with a free surface. Spatial variations in the temperature of the free surface create surface tractions that drive cellular motions. The cells are most commonly hexagonal in shape...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. September 2010, 132(9): 091503.
Published Online: July 6, 2010
...Rishi Raj; Jungho Kim A pool boiling regime map demarcating the boundary between the surface tension and buoyancy dominated boiling regimes is developed based on heater size and gravity. For large heaters and/or high gravity conditions, boiling is dominated by buoyancy, and the ebullition cycle...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. August 2010, 132(8): 081501.
Published Online: June 9, 2010
.... Using these forces, a local parameter model is developed to predict the flow boiling CHF. The theoretical model is an extension of an earlier pool boiling CHF model and incorporates force balance among the evaporation momentum, surface tension, inertia, and viscous forces. Weber number, capillary number...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. April 2010, 132(4): 041002.
Published Online: February 17, 2010
... visualisation heat transfer high-speed optical techniques microchannel flow nucleation flow boiling microchannel micro-pin fin bubble departure frequency bubble departure diameter surface tension Flow boiling in microchannels has been extensively studied during the past several years...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. December 2009, 131(12): 121007.
Published Online: October 15, 2009
... through numerical modeling is needed to design efficient spray cooling system. A computational fluid dynamics based 3D multiphase model for spray cooling is developed here in parallel computing environment using multigrid conjugate gradient solver. This model considers the effect of surface tension...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. September 2009, 131(9): 091502.
Published Online: June 25, 2009
... 25 06 2009 boiling bubbles capillarity convection nucleation organic compounds surface tension zero gravity experiments boiling variable gravity microgravity thermocapillary convection dissolved gas heater size A plot of q b ″ versus acceleration during...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. June 2009, 131(6): 062502.
Published Online: April 7, 2009
...Hulin Huang; Xiaoming Zhou When a temperature gradient is imposed along a liquid-liquid interface, thermocapillary convection is driven by the surface tension gradient. Such flow occurs in many application processes, such as thin-film coating, metal casting, and crystal growth. In this paper...