The efficiency of a wire-mesh separator as an entrainment eliminator has been experimentally determined in an evaporator employing a sodium chloride brine to trace the entrainment throughout the system. Superficial linear velocities have been tested with efficiencies ranging from less than 80% at lower velocities up to 99.9% at 17 ft./sec. Higher superficial linear velocities were explored, but the results were erratic, with reentrainment from the separator visually evident. The experimental data have been correlated by the assumption, and development, of a proposed mechanip for the capture of the entrainment particles by the wires in the separator. This mechanism is developed from a theoretical derivation by Langmuir and Blodgett used for correlating the stoppage of mist particles by the leading edges of airplanes and has been found to correlate the experimental data very well, so that predictions in unworked ranges may be made. The separator as applied in this experimental work behaved as an impingement-type, inertial entrainment eliminator.The use of the presently developed equations permits the recommendation of specifications to be used in the fabrication of a separator for its most efficient performance if the nature of the entrainment and conditions of operation are known.Carryover, or carry along, of liquid particles (entrainment) in gas and vapor streams has been given much attention. Some of the recent and important studies evaluating the effect of entrainment in fractionating colunms are those of Souders and Brown ( 3 3 ) ; Holbrook and Baker (16) ; Rhodes (27,28) ; Sherwood and Jenny ( 3 2 ) ; Colburn ( 4 ) ; Rhodes and Slachman(29) ; Ashraf, Cubbage and Huntington (1) ; and Eduljee(6) ; and to evaluate the effect of entrainment in evaporators there have been the reports of Cessna and Badger (3) and O'Connell and Pettyjohn (25).More recently, however, methods for the removal of entrainment from gas and vapor streams has been the object of most study. These studies have involved the use of standard equipment such as the settling chamber, the cyclone separator, the centrifuge, screens, baffle plates, and their modifications. Typical of such studies are those of Pollak and Work(Z6), observing the performance of various types of cyclone separators; C. L. Carpenter is with Northern Chemical Industries, Inc., Searsport, Maine. Vol. 1, No. 4Campbell(2) the design and use of a special type of scrubber for the recovery of crude-oil mist from natural gas ; Lowrie-Fairs ( 2 3 ) the use of the Calder-Fox scrubber ; and Houghton and Radford(f7) the development of a new type of streamlined eliminator for removal of fine liquid droplets containing calcium chloride remaining in the air after local dissipation of natural fog by means of a spray of calcium chloride solution.Separators consisting of targets of fine wires or fibers upon which the droplets in a stream of entrainment-laden gas o r vapors are removed by filming on the filaments, have been found to be very effective. Hammond and Leary(l5) used a separator of...

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Advancements in liquid propellant rocket engines (LPRE) are requiring higher thermal loads for long duration times. Regenerative cooling has been shown to be a highly effective cooling technique for LPRE. To authors' knowledge, there have not been any previous work published that explores the use of turbulators in regenerative cooling channels for LPRE application. In the present study, regenerative cooling of a high performance engine is modeled numerically to explore the effects of introducing turbulence inducing structures to the coolant passages. The addition of longitudinal ribs at critical locations within the coolant channel have shown to reduce the maximum temperature experienced by the nozzle casing by 32K with a less than 1% pressure rise compared to the conventional design. The addition of ribs is observed to provide a relatively uniform increase in the local heat transfer on the coolant channel surface. NomenclatureAR = aspect ratio CC = combustion chamber LPRE = liquid propellant rocket engine e = setp height H = height of the channel P = pitch