The temperature jump at the inlet of the continuous phase in a spray column heat exchanger

AIChE Journal ◽  
1968 ◽  
Vol 14 (5) ◽  
pp. 831-833 ◽  
Author(s):  
Ruth Letan ◽  
Ephraim Kehat
Keyword(s):  
Heat Exchanger ◽  
Temperature Jump ◽  
Continuous Phase ◽  
Spray Column

Performance of a Three-Phase, Spray-Column, Direct-Contact Heat Exchanger

1989 ◽  
Vol 111 (1) ◽  
pp. 166-172 ◽  
Author(s):  
T. C¸oban ◽  
R. Boehm
Keyword(s):  
Heat Exchanger ◽  
Direct Contact ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Column Height ◽  
Contact Heat ◽  
Factors Affecting ◽  
Spray Column ◽  
Three Phase ◽  
New Formulation

A numerical model of a three-phase, direct-contact, spray-column heat exchanger has been developed. This model has been used to calculate performance information about this type of device and to compare, where possible, to experiments. General equations are defined for distance up the column using a physically based model for the local heat transfer. This model has been used to investigate a number of characteristics of these devices, such as temperature and holdup distributions through the column. A new formulation is given for a mixed, time-averaged temperature that may be representative of measurements taken with temperature transducers in direct-contact heat exchangers. Little has been given in the literature about quantitative variations of performance as a function of the key independent variables, and information on these aspects is presented here. Although the results presented are for a specific geometry (0.61 m diameter, 3 m active column height, evaporating pentane in 85°C water), the variations shown can give insights generally into the factors affecting performance in these devices. In virtually all cases examined here, extremely good comparisons are shown between predictions and measurements. Conclusions are drawn about the applicability of the model and the important effects demonstrated.

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

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Hameed B. Mahood ◽  
Adel O. Sharif ◽  
Seyed Ali Hosseini ◽  
Rex B. Thorpe
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Heat Exchanger ◽  
Transfer Coefficient ◽  
Direct Contact ◽  
Relative Velocity ◽  
Contact Heat ◽  
Spray Column ◽  
Three Phase ◽  
Direct Contact Heat Exchanger

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.

A Heuristic Evaluation of the Governing Mode of Heat Transfer in a Liquid–Liquid Spray Column

1989 ◽  
Vol 111 (3) ◽  
pp. 773-779 ◽  
Author(s):  
H. R. Jacobs ◽  
M. Golafshani
Keyword(s):  
Heat Transfer ◽  
Small Diameter ◽  
Continuous Phase ◽  
Organic Liquids ◽  
One Dimensional ◽  
Spray Column ◽  
Column Type ◽  
Liquid Heat ◽  
Interphase Heat Exchange ◽  
Contact Liquid

A steady-state one-dimensional multiphase flow model is developed to describe the characteristics of a spray column type direct-contact liquid–liquid heat exchanger. Several models are assumed to describe the interphase heat exchange between water as the continuous phase and organic liquids as the dispersed phase. For small-diameter droplets, it is shown that existing experimental data are best described by a model that assumes the heat transfer is controlled by conduction within the drops.

Effect of vertical alignment on continuous-phase axial mixing in a pilot liquid/liquid spray column

AIChE Journal ◽  
1982 ◽  
Vol 28 (5) ◽  
pp. 858-861 ◽  
Author(s):  
Milos Horvath ◽  
Constantine Pikios ◽  
S. D. Cavers
Keyword(s):  
Continuous Phase ◽  
Vertical Alignment ◽  
Spray Column ◽  
Liquid Spray

Droplet Heating in a Direct-Contact Heat Exchanger: Effect of Electric Field

2005 ◽  
Author(s):  
Rajkumar Subramanian ◽  
Milind A. Jog
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Electric Field ◽  
Direct Contact ◽  
Transfer Problem ◽  
Continuous Phase ◽  
Immiscible Fluids ◽  
Contact Heat ◽  
Spherical Droplet ◽  
Direct Contact Heat Exchanger

Heat transfer between two immiscible fluids in a direct contact heat exchanger can be enhanced by the application of an electric field. In this paper, we have numerically modeled heat transfer to a spherical droplet translating in an immiscible medium with an applied electric field. The electric field induces circulatory motion inside and outside the droplet that results in increase in the rate of heat transport. The governing equations for both phases are solved simultaneously by a finite volume method. The external heat transfer problem is considered where the bulk of the resistance is assumed to be in the continuous phase. Effects of electric field strength and translational Reynolds number are investigated.

One-dimensional numerical model for a spray column heat exchanger

AIChE Journal ◽  
1991 ◽  
Vol 37 (11) ◽  
pp. 1673-1679 ◽  
Author(s):  
Steven M. Summers ◽  
Clayton T. Crowe
Keyword(s):  
Heat Exchanger ◽  
Numerical Model ◽  
One Dimensional ◽  
Spray Column
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