Experimental and numerical study of direct contact heat exchangers

Tadrist, Lounès; Seguin, P.; Santini, R.; Pantaloni, J.; Bricard, A.

doi:10.1016/0017-9310(85)90129-2

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…Figures 2 and 3 show the variation of dispersed and continuous phase temperatures and the spray column height at different initial phases temperatures and flow rates, with an initial drop radius equal to 2 mm and 1.6 mm. It can be clearly seen, that three visible regions appear on these figures, which agrees with [1]. The first region is at the phases' entrance, where the temperature difference is at its maximum between the phases.…”

Section: Resultssupporting

confidence: 87%

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Analytical Modelling of a Spray Column Three-Phase Direct Contact Heat Exchanger

Mahood

Sharif

Hosseini

et al. 2013

ISRN Chemical Engineering

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An analytical model for the temperature distribution of a spray column, three-phase direct contact heat exchanger is developed. So far there were only numerical models available for this process; however to understand the dynamic behaviour of these systems, characteristic models are required. In this work, using cell model configuration and irrotational potential flow approximation characteristic models has been developed for the relative velocity and the drag coefficient of the evaporation swarm of drops in an immiscible liquid, using a convective heat transfer coefficient of those drops included the drop interaction effect, which derived by authors already. Moreover, one-dimensional energy equation was formulated involving the direct contact heat transfer coefficient, the holdup ratio, the drop radius, the relative velocity, and the physical phases properties. In addition, time-dependent drops sizes were taken into account as a function of vaporization ratio inside the drops, while a constant holdup ratio along the column was assumed. Furthermore, the model correlated well against experimental data.

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Section: Resultssupporting

confidence: 87%

“…Generally, there are two types of spray column, depending on which injection technique is being used: an integrated type and a split type. In the former, the cold fluid is dispersed from the bottom of the column into a hot fluid, whereas in the second one, the hot fluid is pumped in countercurrently with the flowing cold fluid [1].…”

Section: Introductionmentioning

confidence: 99%

Analytical Modelling of a Spray Column Three-Phase Direct Contact Heat Exchanger

Mahood

Sharif

Hosseini

et al. 2013

ISRN Chemical Engineering

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“…However, these equations are not always easy to solve-particularly if stochastic components of media motion are taken into account when the equations (or a part of them) become partial differential equations. Some of examples of such approach application can be found in papers [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A Cell Model to Describe and Optimize Heat and Mass Transfer in Contact Heat Exchangers

Mizonov¹,

Yelin²,

Yakimychev³

2011

EPE

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A cell model to describe and optimize heat and mass transfer in contact heat exchangers for utilization of exhaust gases heat is proposed. The model is based on the theory of Markov chains and allows calculating heat and mass transfer at local moving force of the processes in each cell. The total process is presented as two parallel chains of cells (one for water flow and one for gas flow). The corresponding cells of the chains can exchange heat and mass, and water and gas can travel along their chains according to their transition ma-trices. The results of numerical experiments showed that the most part of heat transfer occurs due to moisture condensation from gas and the most intense heat transfer goes near the inlet of gas. Experimental validation of the model showed a good correlation between calculated and experimental data for an industrial contact heat exchanger if appropriate empirical equations were used to calculate heat and mass transfer coefficient. It was also shown that there exists the optimum height of heat exchanger that gave the maximum gain in heat energy utilization

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Enhancement of Direct-Contact Heat Transfer in Concentric Annuli

Özbelge

Shahidi

1999

Heat Transfer Enhancement of Heat Exchangers

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Experimental and numerical study of direct contact heat exchangers

Cited by 5 publications

References 10 publications

Analytical Modelling of a Spray Column Three-Phase Direct Contact Heat Exchanger

Analytical Modelling of a Spray Column Three-Phase Direct Contact Heat Exchanger

A Cell Model to Describe and Optimize Heat and Mass Transfer in Contact Heat Exchangers

Enhancement of Direct-Contact Heat Transfer in Concentric Annuli

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