Turbulent direct-contact heat transfer between two immiscible fluids

Lemenand, Thierry; Durandal, Cédric; Valle, Dominique Della; Peerhossaini, Hassan

doi:10.1016/j.ijthermalsci.2010.05.014

Cited by 39 publications

(11 citation statements)

References 46 publications

(62 reference statements)

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“…While these are also not the focus of present work, a few representative works are discussed below for the insight they provide on liquid-liquid flow and heat transfer enhancement due to the flow patterns observed. Habchi and coworkers examined liquid-liquid dispersion, droplet formation and breakup, and direct-contact heat transfer between immiscible liquids by facilitating mixing in straight flow, helically-coiled flow and twisted-pipe flow (chaotic advection) and in a high-efficiency vortex static mixer (Lemenand et al, 2010). Commercial-grade vegetable oil ) and vaseline oil (Lemenand et al, 2010) were used as the organic phase.…”

Section: Heat Transfer To Liquid-liquid Mixturesmentioning

confidence: 99%

“…Habchi and coworkers examined liquid-liquid dispersion, droplet formation and breakup, and direct-contact heat transfer between immiscible liquids by facilitating mixing in straight flow, helically-coiled flow and twisted-pipe flow (chaotic advection) and in a high-efficiency vortex static mixer (Lemenand et al, 2010). Commercial-grade vegetable oil ) and vaseline oil (Lemenand et al, 2010) were used as the organic phase. Chaotic advection generated in twisted pipe produced smaller and more homogeneous droplets than a helically coiled mixer.…”

Section: Heat Transfer To Liquid-liquid Mixturesmentioning

confidence: 99%

“…By introducing n-butanol in calculated quantities to modify the organic phase, it was observed that the reduction of continuous phase viscosity intensified the emulsification process, and enhanced mass transfer as well as providing a smaller droplet size distribution than in regular Dean flow. A phenomenological model for heat transfer was validated with experimental data (Lemenand et al, 2010) and longitudinal embedded vorticity was identified as the main intensification factor for heat transfer. Finally, using a microdispersion contactor, Wang et al (2008) studied heat transfer microdispersing hot octane and hexane into cold water, by cross flow of the oil phase into water through a membrane.…”

Section: Heat Transfer To Liquid-liquid Mixturesmentioning

confidence: 99%

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Heat transfer to immiscible liquid mixtures in a spiral plate heat exchanger

Sathiyan

Rangarajan

Ramachandran³

2013

Braz. J. Chem. Eng.

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-This work presents new predictive correlations for heat transfer to immiscible liquid-liquid mixtures in a spiral plate heat exchanger. Liquid-liquid heat transfer studies were carried out in spiral plate heat exchangers for the water-octane, water-kerosene, and water-dodecane systems. For each composition of the mixture, the mass flow rate of the cold fluid was varied, keeping that of the hot fluid and the fluid inlet temperatures constant. Two-phase cold flow rates were in the laminar range, while the hot fluid flow was turbulent. Calculations of the LMTD (log mean temperature difference) correction factor showed that the flow was countercurrent. Heat transfer coefficients of the two-phase liquids were found to be strongly dependent on the composition of the liquid mixture and exhibited abrupt transitions as a function of the compositions. Given the absence of predictive correlations in the literature that sufficiently capture this compositiondependence, new empirical correlations were developed using part of the experimental data, with the composition of the cold fluid as an explicit variable. Statistical analysis of the regression yielded satisfactory results. The correlations were tested against the rest of the experimental data and were found to predict heat transfer coefficients within ± 15%. These preliminary studies should be useful in designing compact exchangers for handling two-phase water-organics mixtures.

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Section: Heat Transfer To Liquid-liquid Mixturesmentioning

confidence: 99%

Section: Heat Transfer To Liquid-liquid Mixturesmentioning

confidence: 99%

Section: Heat Transfer To Liquid-liquid Mixturesmentioning

confidence: 99%

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Heat transfer to immiscible liquid mixtures in a spiral plate heat exchanger

Sathiyan

Rangarajan

Ramachandran³

2013

Braz. J. Chem. Eng.

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“…The test section used in this study is designed based on the industrial HEV (High-Efficiency Vorticity) static mixer [25] that is a well-studied device and is used as multifunctional heat exchangers/reactors [26,27]. This apparatus is being increasingly incorporated in process industry for its mixing and heat transfer capabilities.…”

Section: Introductionmentioning

confidence: 99%

Vorticity and convective heat transfer downstream of a vortex generator

Lemenand

Habchi

Valle

et al. 2018

International Journal of Thermal Sciences

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Vorticity generation has been identified, since the 80's, as an efficient means for enhancing heat transfer; the mean radial velocity component due to the induced flow pattern contributes to the heat removal. In the present work, momentum and heat transfer are studied in a test section designed to mimic the industrial HEV (High-Efficiency Vorticity) mixer. It consists of a basic configuration with a unique vorticity generator inserted on the bottom wall of a heated straight channel. The aim of this work is to analyze to which extend the convective heat transfer is correlated to the vorticity, as it is presumed to cause the intensification. In this case, the driving vorticity is the streamwise vorticity flux Ω, and the heat transfer is characterized by the Nusselt number Nu, both quantities being spanwise averaged. The study is mainly numerical; we have used the previous PIV measurements and DNS data from the open literature to validate the numerical simulations. It is shown that there exists a strong correlation between the vorticity flux and Nusselt number close to the vortex generator. However, the axial variation diverges for these quantities when moving downstream. The Nusselt number presents a sharp peak over the VG and decreases nearly to its basic level just behind the VG, while the vortex persists far downstream from the tab and relaxes very slowly. Heat transfer intensification at the Nusselt peak is about 100%, and reduces to about 6% downstream of the VG, the intensity of the vorticity momentum being decreased only to about 50% of its peak value at the test section outlet.

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“…Typical applications range from the reactor in polymer systems (Fourcade et al, 2001), heat or mass transfer alternative devices (Simões et al, 2008), mixing liquid-liquid systems in the laminar or turbulent flow (Rama Rao et al, 2007) to intensifying gas-liquid mass transfer processes (Al Taweel et al, 2005). Moreover, static mixers have a wide range of applications, such as continuous mixing, chemical reactors or mass and heat transfer processes or a thermal homogenization (Li et al, 1996;Visser et al, 1999;Lemenand et al, 2010). Several theoretical and experimental studies of the pressure drop are presented in (Liu et al, 2006;Engler et al, 2004;Hobbs et al, 1998;Kumar et al, 2008;Li et al, 1997;Joshi et al, 1995).…”

Section: Introductionmentioning

confidence: 99%