Vapor/liquid interaction and entrainment in shell-and-tube evaporators

Abstract

The kilities a£ Argcmae Sakirand Laboratory a r e oumed by ltfie UaOtedl State$ G m mmeat, Undsr Eke terms of a eontsaet (W-32-109-Znf;-3%) batwee$ &e U. 5. Department of hergy, Argeane Universttier Aesoela%an and The Uaivaraity of (=%doago, ; t h Waiversitp eril@sya the staff rrnd operates the Laboratory Sn aecrrrdance w i f p~licieiir and program fosa~ulatad, ape proved and reviewed by the Aaeoeiation.

Discontinuous and Transient Behavior Evolutionary Laws of Flow and Temperature Characteristics of Droplet Mode over a Horizontal Tube Falling Film

“…The fluid diffused through the wall of the superhydrophilic tube with the action of surface tension, viscous force, and gravity. The overall axial extent of the computational domain was set based on the spacing of Taylor instability, 34 which was about 22 mm for water.…”

Comparative study of working fluids for OTEC power plants

“…Liquid entrainment is a problem that occurs mainly in sprayed-bundle evaporators (horizontal thin-film ~vaporators), as explained in [23]. At the moderate vapor velocities, defiection of the liquid columns and entrain~ent of drops occur [24]. As a result, dry regions may form on the shell side.…”

“…14, freon-114 is not a suitable fluid for a sprayed bundle unless the bundle diameter is small or vapor lanes are incorporated into the bundle layout. More information on shell-side velocities and liquid entrainment in both horizontal and vertical film heat exchangers is given in [24].…”

Concurrent studies of enhanced heat transfer and materials for ocean thermal heat exchangers. Semi-annual progress report, March 1--August 31, 1978. [OSCAR code; OTEC Steady-state and Control System Analysis Routines]

“…The transition of film flow between the shear-controlled and gravity-controlled regimes on horizontal tube bundles can be well described by a dimensionless gas velocity Jg [5]. In addition, the liquid entrainment and the breakdown of films have been analyzed in [6,7], respectively. In spite of this, the general behavior of this shear dominant film flow is still not well known.…”