Experimental investigation of in-line tube bundle heat transfer process to vertical downward foam flow

Gylys, J.; Zdankus, T.; Jonynas, Rolandas; Maladauskas, R.

doi:10.1016/j.ijheatmasstransfer.2011.02.031

Cited by 8 publications

(9 citation statements)

References 7 publications

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“…In this section, the data reported by Gylys et al [14,15,46] and previously discussed were used. In these measurements, the cross-sectional area A was equal to 0.02 m 2 while l T = l L = 1.5 for the aligned tubes and l T = 3.5 and l L = 0.875 for the staggered tubes.…”

Section: Resultsmentioning

confidence: 99%

“…Then, convective heat transfer takes place between the rock formation and the foams [13]. Finally, macrofoams have also been considered as a working fluid in heat exchangers to take advantage of the fact that the associated heat transfer coefficient is significantly larger than that achieved using air under the same conditions [14,15]. This could reduce the size and mass of air-based heat exchangers.…”

Section: Introductionmentioning

confidence: 99%

“…More recently, Gylys et al [14,15] investigated convective heat transfer in dry aqueous foams with porosity of 99.6%, 99.7% and 99.8% and velocities between 0.14 m/s and 0.32 m/s. The authors reported the local heat transfer coefficient as a function of fluid velocity for upward and downward vertical aqueous foam flow across staggered and aligned tube bundles of diameter D = 0.02 m at different tube locations.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it was impossible to estimate the foam’s effective viscosity and capillary number. Gylys et al [14,15] derived an empirical correlations for predicting the local Nusselt number, based on the effective foam thermal conductivity given by the parallel model. The average Nusselt number was expressed as a function of the gas phase Reynolds number for foam flow across staggered tube bundles [14].…”

Section: Introductionmentioning

confidence: 99%

“…The average Nusselt number was expressed as a function of the gas phase Reynolds number for foam flow across staggered tube bundles [14]. The average heat transfer coefficient was given as a function of foam porosity and velocity for foam flow across the aligned tube bundle [15]. Unfortunately, these correlations were derived from a limited data set with specific geometric features and therefore the validity of these correlations for other tube bundle dimensions and different foam properties is unknown.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Convective heat transfer in foams under laminar flow in pipes and tube bundles

Attia

McKinley

Moreno-Magana

et al. 2012

International Journal of Heat and Mass Transfer

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The present study reports experimental data and scaling analysis for forced convection of foams and microfoams in laminar flow in circular and rectangular tubes as well as in tube bundles. Foams and microfoams are pseudoplastic (shear thinning) two-phase fluids consisting of tightly packed bubbles with diameters ranging from tens of microns to a few millimeters. They have found applications in separation processes, soil remediation, oil recovery, water treatment, food processes, as well as in fire fighting and in heat exchangers. First, aqueous solutions of surfactant Tween 20 with different concentrations were used to generate microfoams with various porosity, bubble size distribution, and rheological behavior. These different microfoams were flowed in uniformly heated circular tubes of different diameter instrumented with thermocouples. A wide range of heat fluxes and flow rates were explored. Experimental data were compared with analytical and semi-empirical expressions derived and validated for single-phase power-law fluids. These correlations were extended to two-phase foams by defining the Reynolds number based on the effective viscosity and density of microfoams. However, the local Nusselt and Prandtl numbers were defined based on the specific heat and thermal conductivity of water. Indeed, the heated wall was continuously in contact with a film of water controlling convective heat transfer to the microfoams. Overall, good agreement between experimental results and model predictions was obtained for all experimental conditions considered. Finally, the same approach was shown to be also valid for experimental data reported in the literature for laminar forced convection of microfoams in rectangular minichannels and of macrofoams across aligned and staggered tube bundles with constant wall heat flux.

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Section: Resultsmentioning

confidence: 99%