Some experimental progresses in the study of self-rewetting fluids for the SELENE experiment to be carried in the Thermal Platform 1 hardware

Savino, Raffaele; Cecere, Anselmo; Vaerenbergh, S. Van; Abe, Yoshiyuki; Pizzirusso, G.; Tzevelecos, Wassilis; Mojahed, Mohamed; Galand, Quentin

doi:10.1016/j.actaastro.2013.03.020

Cited by 22 publications

(12 citation statements)

References 18 publications

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“…In the present paper, we are interested in the thermocapillary migration of a deformable bubble inside a cylindrical tube filled with liquids that exhibit a non-monotonic dependence of the surface tension on temperature. In particular, these so-called "self-rewetting" fluids (Vochten & Petre 1973;Petre & Azouni 1984;Limbourgfontaine et al 1986;Savino et al 2009Savino et al , 2013, which are non-azeotropic, high carbon alcohol solutions, have quasi parabolic surface tensiontemperature curves with well-defined minima; the parabolicity of these curves increases with alcohol concentration. These fluids were first studied by Vochten & Petre (1973) who observed the occurrence of the minimum in surface tension with temperature in high carbon alcohol solutions.…”

Section: Introductionmentioning

confidence: 99%

“…More recently, work on self-rewetting fluids was extended to microgravity conditions for space applications on the International Space Station. Savino et al (2013), and Hu et al Hu et al (2014) demonstrated that the use of these fluids within micro oscillating heat pipes led to an increase in the efficiency of these devices. In a slightly different context, it was very recently shown that the presence of a minimum in surface tension can also have a significant impact on the dynamics of the flow giving rise to very interesting phenomena such as the thermally induced "superspreading" (Karapetsas et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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Non-isothermal bubble rise: non-monotonic dependence of surface tension on temperature

et al. 2014

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We study the motion of a bubble driven by buoyancy and thermocapillarity in a tube with a non-uniformly-heated walls, containing a so-called "self-rewetting fluid"; the surface tension of the latter exhibits a parabolic dependence on temperature with a well-defined minimum. In the Stokes flow limit, we derive the conditions under which a spherical bubble can come to rest in a self-rewetting fluid whose temperature varies linearly in the vertical direction, and demonstrate that this is possible for both positive and negative temperature gradients. This is in contrast to the case of simple fluids whose surface tension decreases linearly with temperature for which bubble motion is arrested for negative temperature gradients only. In the case of self-rewetting fluids, we propose an analytical expression for the position of bubble arrestment as a function of other dimensionless numbers. We also perform direct numerical simulation of axisymmetric bubble motion in a fluid whose temperature increases linearly with vertical distance from the bottom of the tube; this is done for a range of Bond and Gallileo numbers, and for various parameters that govern the functional dependence of surface tension on temperature. We demonstrate that bubble motion can be reversed and then arrested in self-rewetting fluids only, and not in linear ones, for sufficiently small Bond numbers. We also demonstrate that considerable bubble elongation is possible under significant wall confinement, and for strongly self-rewetting fluids and large Bond numbers. The mechanisms underlying the phenomena observed are elucidated by considering how the surface tension dependence on temperature affects the thermocapillary stresses in the flow.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Non-isothermal bubble rise: non-monotonic dependence of surface tension on temperature

et al. 2014

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“…Moreover, the same authors also published similar heat transfer coefficients achieved in pool boiling at various concentrations of aqueous butanol solutions [30]. Experimental results of the surface tension gradient for the 2.9 wt% and 4.9 wt% aqueous butanol solutions were also presented in Savino et al [31] with the research focused on thermal management with the use of self-rewetting fluids in microgravity conditions. All publications as well as the presented study confirm a substantial decrease in surface tension with increasing the concentration of butanol in water, however the positive surface tension gradient, which is crucial for an enhanced heat transfer, is very similar in a large range of butanol concentrations.…”

Section: Silicon Wafer Rms Roughnessmentioning

confidence: 70%

Heat transfer enhancement of self-rewetting aqueous n-butanol solutions boiling in microchannels

Sitar

Golobič

2015

International Journal of Heat and Mass Transfer

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“…They found that the size of the slugs was considerably smaller than that associated with fluids such as water. More recently, work on self-rewetting fluids was extended to microgravity conditions for space applications on the International Space Station, 26 and Hu et al 33 demonstrated that the use of these fluids within micro oscillating heat pipes led to an increase in the efficiency of these devices.…”

Section: ■ Introductionmentioning

confidence: 99%

Thermocapillary-Driven Motion of a Sessile Drop: Effect of Non-Monotonic Dependence of Surface Tension on Temperature

et al. 2014

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ABSTRACT:We study the thermocapillary-driven spreading of a droplet on a nonuniformly heated substrate for fluids associated with a non-monotonic dependence of the surface tension on temperature. We use lubrication theory to derive an evolution equation for the interface that accounts for capillarity and thermocapillarity. The contact line singularity is relieved by using a slip model and a Cox-Voinov relation; the latter features equilibrium contact angles that vary depending on the substrate wettability, which, in turn, is linked to the local temperature. We simulate the spreading of droplets of fluids whose surface tension−temperature curves exhibit a turning point. For cases wherein these turning points correspond to minima, and when these minima are located within the droplet, then thermocapillary stresses drive rapid spreading away from the minima. This gives rise to a significant acceleration of the spreading whose characteristics resemble those associated with the "superspreading" of droplets on hydrophobic substrates. No such behavior is observed for cases in which the turning point corresponds to a surface tension maximum. ■ INTRODUCTIONThe motion of sessile droplets over liquids and solids is of central importance to a number of industrial applications such as coating flow technology, inkjet printing, microfluidics and microelectronics, and medical diagnostics. Despite the apparent simplicity of the physical setup involved, this motion is rather complex and some of its aspects remain poorly understood; in particular, the mechanisms underlying the dynamics of the threephase contact line are still the subject of debate. In view of its complexity 1 and its practical importance, droplet motion has received considerable attention in the literature and has been the subject of two major reviews. 2,3 In this work, we consider the motion of sessile droplets on non-isothermal solid walls, driven by thermocapillarity. The walls underlying the droplets are subjected to a temperature gradient which induces surface tension gradient-driven droplet deformation and migration from low to high surface tension regions. Thermocapillary-driven droplet motion was studied by Bouasse 4 who demonstrated the possibility of inducing droplet-climbing on a heated wire, against the action of gravity, by heating its lower end. Studies involving horizontal substrates have shown that, unless the magnitude of the imposed temperature gradient is sufficiently large, no droplet motion is possible due to contact angle hysteresis, while under certain conditions, steady migration of droplets has been shown. 5,6 A number of studies have examined the thermocapillary motion of droplets theoretically. Brochard 7 determined the spreading characteristics of a wedge-shaped drop in the presence of chemical or thermal gradients via local force and energy balances. This work was generalized by Ford and Nadim 8 to arbitrary, two-dimensional droplet shapes and different contact angles at the two contact lines. Lubrication theory was used to describe the...

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Some experimental progresses in the study of self-rewetting fluids for the SELENE experiment to be carried in the Thermal Platform 1 hardware

Cited by 22 publications

References 18 publications

Non-isothermal bubble rise: non-monotonic dependence of surface tension on temperature

Non-isothermal bubble rise: non-monotonic dependence of surface tension on temperature

Heat transfer enhancement of self-rewetting aqueous n-butanol solutions boiling in microchannels

Thermocapillary-Driven Motion of a Sessile Drop: Effect of Non-Monotonic Dependence of Surface Tension on Temperature

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