Experimental Research of Heat Transfer from an In-Line Tube Bundle to a Vertical Foam Flow

Gylys, J.; Zdankus, T.; Gabrielaitiene, Irena; Sinkunas, S.

doi:10.1615/heattransres.v40.i5.80

Cited by 10 publications

(7 citation statements)

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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%

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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%

“…Figs. 6a and 7a plots the average heat transfer coefficient versus U max reported for foam flows across aligned and staggered arrangements, respectively [14,15,46]. They indicate that the heat transfer coefficient increases with increasing flow velocities.…”

Section: Resultsmentioning

confidence: 99%

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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“…1b) to the vertical upward foam flow was investigated initially [8,9]. Then the non-standard tube bundle ( The heat transfer intensity of tube A2 is on average 1.6 times higher than that of tube D2 for β=0.996, 1.5 times higher than that of tube D2 for β=0.997 and 1.4 times higher than that of tube D2 for β=0.998, (Re g =190~440).…”

Section: Resultsmentioning

confidence: 99%

“…The experimental equipment [7,9] consisted of the following parts: a vertical experimental channel with integrated non-standard tube bundle, gas and liquid control valves, gas and liquid flow meters, a liquid storage reservoir, a liquid level control reservoir, a compressor with a receiver, an electric current transformer and a stabilizer. The cross section of the experimental channel had the dimensions of 0.14 x 0.14 m 2 ; its height was 1.8 m. The walls of the channel were made from transparent material so that the foam flow could be observed visually.…”

Section: Experimental Set-upmentioning

confidence: 99%

Experimental investigation of the heat transfer process between a tube bundle and an upward aqueous foam flow

Gylys

Zdankus

Sinkunas

et al. 2010

Advanced Computational Methods and Experiments in Heat Transfer XI

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High heat transfer intensity and low energy consumption for coolant transportation to heat transfer location are really significant nowadays. An extended range of heat transfer intensity control (control of volumetric void fraction and flow rate of coolant) and low mass flow rate of coolant are one of the most important factors for heat exchangers. In some cases the usage of aqueous foam as a coolant can solve all of the mentioned problems. Our previous investigation showed that heat transfer between a heated tube and aqueous foam flow is over five to ten times lower for the water coolant, but the density of foam is more than one hundred times lower than that of water. When applying aqueous foam as a coolant in practice, some cases are problematic. The reasons for this are the variation of the structure and the characteristics of foam. Therefore, usage of aqueous foam as a coolant needs to be narrowly explored. This work follows our previous investigations.

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“…Application of the two-phase coolants, such as aqueous foam, in practice could significantly reduce material and energy demands, simultaneously sustaining the proper heat transfer intensity on the heated surfaces [13]. Such advantages of aqueous foam give a chance to create a compact, light, safe and economic heat exchanger [1,13].…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Between the Non-Standard Tube Bundle and Statically Stable Foam Flow

Gylys

Zdankus

Ingilertas

et al. 2012

mech

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NomenclatureA -cross section area of experimental channel, m 2 ; d -outside diameter of tube, m; G -volumetric flow rate, m 3 /s; h -average coefficient of heat transfer, W/(m 2 K); k, m, n -coefficients; Nu -Nusselt number; q -heat flux density, W/m 2 ; Re -Reynolds number; T -average temperature, K;  -volumetric void fraction;  -thermal conductivity, W/(mK);  -kinematic viscosity, m 2 /s.

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Experimental Research of Heat Transfer from an In-Line Tube Bundle to a Vertical Foam Flow

Cited by 10 publications

References 0 publications

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

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

Experimental investigation of the heat transfer process between a tube bundle and an upward aqueous foam flow

Heat Transfer Between the Non-Standard Tube Bundle and Statically Stable Foam Flow

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