... 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...

..., one component of gravity force acts in the plane of rotation and the other component acts in direction of the tube axis. Gravity causes the condensate to flow in a gathered stream at the bottom of the tube. Surface tension acts normally to the surface. The balance of the two forces acting in the plane...

... 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...

... 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...

... of data for the study of instability mechanisms of the Marangoni convection. 25 07 2010 08 09 2011 08 09 2011 11 01 2012 11 01 2012 convection flow instability surface tension two-phase flow Marangoni convection liquid bridge instability microgravity space...

...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...

.... 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...

... 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...

... friction multiplier is shown to decrease as channel diameter decreases due to the influence of viscous and surface tension forces. 06 09 2010 10 05 2011 15 08 2011 15 08 2011 air drag forced convection microchannel flow pattern formation surface tension two-phase flow...

...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...

...Nenad Miljkovic; Ryan Enright; Shalabh C. Maroo; H. Jeremy Cho; Evelyn N. Wang capillarity drops elemental semiconductors evaporation flow visualisation hydrophilicity hydrophobicity nanostructured materials scanning electron microscopy silicon surface tension two-phase flow...

... 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...

... % ( 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...

...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...

...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...

.... 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...

... density, kg   m − 3 σ surface tension, N   m − 1 This work was supported by the Office of Naval Research (Program Officer Mark Spector). The microfabrication was performed in part at the Cornell NanoScale Facility (a member of the National...

... 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...

... 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 Pool boiling involves complicated nonlinear processes...

...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...