Abstract:Successful analysis and modeling of micro heat pipes requires a complete understanding of the vapor–liquid interface. A thermodynamic model of the vapor–liquid interface in micro heat pipes has been formulated that includes axial pressure and temperature differences, changes in local interfacial curvature, Marangoni effects, and the disjoining pressure. Relationships were developed for the interfacial mass flux in an extended meniscus, the heat transfer rate in the intrinsic meniscus, the “thermocapillary” hea… Show more
“…Ž ris, 1997Mor-. Ž ris, , 1999 ; for Marangoni flow see Wayner et al, 1985;Parks and Wayner, 1987;Hallinan et al, 1994;Swanson and . Peterson, 1995;Oron et al, 1997 ; for an extensive discussion Ž .…”
“…Ž ris, 1997Mor-. Ž ris, , 1999 ; for Marangoni flow see Wayner et al, 1985;Parks and Wayner, 1987;Hallinan et al, 1994;Swanson and . Peterson, 1995;Oron et al, 1997 ; for an extensive discussion Ž .…”
“…Swanson and Peterson developed an expression for the evaporative (or condensing) mass flux that includes not only kinetic theory but also the disjoining pressure and variations in the surface tension [6]:…”
Section: Theoretical Modelmentioning
confidence: 99%
“…where the first term is the disjoining pressure with A the Hamaker constant, which is generally about 10 -20 [6], and r 1 and r 2 are the interfacial radii of curvature. The heat transfer is then found by multiplying the mass flux, G, by the heat of vaporization.…”
The multidimensional heat transfer and fluid flow in the microlayer region below a vapor bubble formed during boiling in microgravity are investigated by numerically solving the Navier-Stokes equations with the energy equation. The flow is driven by Marangoni flow due to the surface tension gradient along the bubble surface that results from the temperature gradient. The model also includes condensation and evaporation at the bubble surface.The flow field and heat transfer are calculated for microlayer thicknesses from 0.01 mm to 10 mm to investigate the effect of microlayer thickness. The results show that the velocities are small and have only a small effect on the temperature distribution as compared to the solution for pure conduction in the liquid. Natural convection is shown to have a negligible effect on heat transfer. For less than ideal evaporative heat transfer at the bubble interface, Marangoni convection caused the heat transfer to increase several percent. The flow in the microlayer is shown to agree with the lubrication analogy only for thin, relatively flat interfaces.
“…A thermodynamic model of the vapor-liquid interface in micro heat pipes, including axial temperature and pressure differences, changes in the local interfacial curvature, disjoining pressure and Marangoni effects, was developed by Swanson and Peterson [50]. The vapor-liquid interface was subdivided in this model into three regions -the intrinsic meniscus, the transition region, and the thin film region -and treated separately.…”
Section: Thermodynamics and Fundamental Aspectsmentioning
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