Study of the heat of reversible adsorption at the air-solution interface. II. Experimental determination of the heat of reversible adsorption of some alcohols

Vochten, R.; Pétré, Georges

doi:10.1016/0021-9797(73)90295-6

Cited by 167 publications

(48 citation statements)

References 2 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%

“…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. Petre & Azouni (1984) carried out experiments that involved imposing a temperature gradient on the surface of alcohol aqueous solutions, and used talc particles to demonstrate the unusual behaviour of these fluids.…”

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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“…Previous studies with liquids formed from binary mixtures of water with alcohols (methanol [19], ethanol [20][21][22][23] and 1-propanol [24]) showed a different behaviour compared to pure liquids. Vochten and Petre reported that for dilute aqueous solutions of high carbon alcohols (number of carbon atoms  4), the temperature dependence of the surface tension showed a minimum at certain temperatures (quasi-parabolic profile) [25]. This behaviour leads to a non-linear thermocapillary effect which was studied by Oron et al [26] and later by Slavtchev and Miladinova [27].…”

Section: Introductionmentioning

confidence: 99%

Bubble rise in a non-isothermal self-rewetting fluid and the role of thermocapillarity

Mamalis

Koutsos

Sefiane

2017

International Journal of Thermal Sciences

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We report on the motion of a buoyancy-driven bubble in a vertical micro-channel and the significant role of thermocapillarity. A series of experiments have been carried out using a circular micro-channel filled with pure liquids (pure water and pure 1-butanol) and a selfrewetting fluid (water -1-butanol 5% vol.) under isothermal and non-isothermal controlled conditions. In both cases, different mass fluxes and heat fluxes were applied on the microchannel within the same temperature gradient field (18 o C to 75 o C) which was increasing linearly in the same direction with the liquid flow. We have shown that the behaviour of the bubbles in a self-rewetting fluid departed considerably from that of pure liquids. The anomalous property of the alcohol mixture, i.e. the quasi-parabolic dependence of the surface tension with the temperature, drastically modified the movement (promoted or inhibited) and the shape (spherical or deformed) of the migrating bubbles. These phenomena were explained in terms of the location of the bubble associated with the well-defined surface tension 2 minimum, and as a function of dimensionless numbers. Heat transfer coefficient calculations in the single and two-phase flows were acquired for all the liquids used. We demonstrated that the presence of Marangoni stresses resulted in the enhancement of the heat transfer distribution in the self-rewetting fluid flows compared to the pure liquids.

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“…The value of surface tension decreases with increasing the temperature in most cases. However, for alcohols with a high carbon number, the surface tension increases with increasing temperature (Vochten and Petre, 2005). In such a case, both of concentration and temperature gradients increases the surface tension toward the three-phase interline along the surface of thin liquid film underneath bubbles, provided that the mixture is positive, i.e., the more volatile liquid has smaller surface tension.…”

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confidence: 97%

Heat Transfer Characteristics during Boiling of Immiscible Liquids Flowing in Narrow Rectangular Heated Channels

et al. 2017

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The use of immiscible liquids for cooling of surfaces with high heat generation density is proposed based on the experimental verification of its superior cooling characteristics in fundamental systems of pool boiling and flow boiling in a tube. For the purpose of practical applications, however, heat transfer characteristics due to flow boiling in narrow rectangular channels with different small gap sizes need to be investigated. The immiscible liquids employed here are FC72 and water, and the gap size is varied as 2, 1, and 0.5 mm between parallel rectangular plates of 30 mm × 175 mm, where one plate is heated. To evaluate the effect of gap size, the heat transfer characteristics are compared at the same inlet velocity. The generation of large flattened bubbles in a narrow gap results in two opposite trends of the heat transfer enhancement due to thin liquid film evaporation and of the deterioration due to the extension of dry patch in the liquid film. The situation is the same as that observed for pure liquids. The latter negative effect is emphasized for extremely small gap sizes if the flow rate ratio of more-volatile liquid to the total is not reduced. The addition of small flow rate of less-volatile liquid can increase the critical heat flux (CHF) of pure more-volatile liquid, while the surface temperature increases at the same time and assume the values between those for more-volatile and less-volatile liquids. By the selection of small flow rate ratio of more-volatile liquid, the surface temperature of pure less-volatile liquid can be decreased without reducing high CHF inherent in the less-volatile liquid employed. The trend of heat transfer characteristics for flow boiling of immiscible mixtures in narrow channels is more sensitive to the composition compared to the flow boiling in a round tube.

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Study of the heat of reversible adsorption at the air-solution interface. II. Experimental determination of the heat of reversible adsorption of some alcohols

Cited by 167 publications

References 2 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

Bubble rise in a non-isothermal self-rewetting fluid and the role of thermocapillarity

Heat Transfer Characteristics during Boiling of Immiscible Liquids Flowing in Narrow Rectangular Heated Channels

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