scholarly journals Direct contact evaporation of a single two-phase bubble in a flowing immiscible liquid medium. Part I: two-phase bubble size

2019 ◽  
Vol 55 (9) ◽  
pp. 2593-2603
Author(s):  
Hameed B. Mahood ◽  
Ali Sh. Baqir ◽  
Al-Dunainawi Yousif ◽  
Anees A. Khadom ◽  
Alasdair N. Campbell
Keyword(s):  
Liquid Medium ◽  
Bubble Size ◽  
Direct Contact ◽  
Immiscible Liquid ◽  
Two Phase

Heat Transfer With Vaporization of a Liquid by Direct Contact in Another Immiscible Liquid: Experimental and Numerical Study

1991 ◽  
Vol 113 (3) ◽  
pp. 705-713 ◽  
Author(s):  
L. Tadrist ◽  
J. Sun ◽  
R. Santini ◽  
J. Pantaloni
Keyword(s):  
Heat Transfer ◽  
Theoretical Model ◽  
Void Fraction ◽  
Direct Contact ◽  
Numerical Study ◽  
Water System ◽  
Immiscible Liquid ◽  
Transfer Model ◽  
Two Phase ◽  
Spray Column

An experimental setup was designed to study direct-contact evaporators using a liquid dispersed in another immiscible liquid. The study was carried out on an n-pentane–water system to determine the influence of different parameters on these systems, and consequently to construct a model for this type of evaporator. An optical probe was used to measure the local void fraction. At different column abscissas along a selected diameter, the local void fraction variations were determined. The shape of the curves can be attributed to the different processes occurring in the spray column. A one-dimensional heat transfer model in the spray column was established. Simplifying assumptions were used to establish and resolve the set of equations governing heat transfer and two-phase flow. The vaporization process induces a volumetric expansion of the two-phase mixture. A theoretical model was used, in which the coalescence between the spherical fluid particles is taken into account. Different coalescence laws dependent on particle density were introduced into the theoretical model and then tested. The numerical results are discussed and compared with the experimental data obtained for the n-pentane–water system.

scholarly journals Heat transfer modelling of two-phase bubbles swarm condensing in three - phase direct - contact condenser

2016 ◽  
Vol 20 (1) ◽  
pp. 143-153 ◽  
Author(s):  
Hameed Mahood ◽  
Adel Sharif ◽  
Sami Al-Ailbi ◽  
Ali Hossini ◽  
Rex Thorpe
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Bubble Size ◽  
Direct Contact ◽  
Convective Heat Transfer Coefficient ◽  
Two Phase ◽  
Three Phase

An analytical model for the convective heat transfer coefficient and the two-phase bubble size of a three-phase direct contact heat exchanger was developed. Until the present, there has only been a theoretical model available that deals with a single two-phase bubble and a bubble train condensation in an immiscible liquid. However, to understand the actual heat transfer process within the three-phase direct contact condenser, characteristic models are required. A quasi - steady energy equation in a spherical coordinate system with a potential flow assumption and a cell model configuration has been simplified and solved analytically. The convective heat transfer in terms of Nu number has been derived, and it was found to be a function to Pe number and a system void fraction. In addition, the two-phase bubble size relates to the system void fraction and has been developed by solving a simple energy balance equation and using the derived convective heat transfer coefficient expression. Furthermore, the model correlates well with previous experimental data and theoretical results.

LIQUID EVAPORATION BY DIRECT CONTACT IN ANOTHER IMMISCIBLE LIQUID

1986 ◽  
Author(s):  
Lounes Tadrist ◽  
Ibraheem Shehu Diso ◽  
M. Larini ◽  
J. Pantaloni
Keyword(s):  
Direct Contact ◽  
Immiscible Liquid ◽  
Liquid Evaporation
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