摘要:

AbstractA review is made of the experimental evidence and theoretical considerations evolving from studies of the wake formed by an aerodynamically‐smooth sphere moving in steady rectilinear motion through a turbulence‐free stream. The roles of complex fluid dynamic phenomena which include boundary layer separation, vorticity transfer and those characterized by the Strouhal Number, as well as less evident fine scale processes are presented, with reference being made to pertinent two‐dimensional cylinder st

ISSN:0008-4034    

DOI:10.1002/cjce.5450370501

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1959

数据来源: WILEY

摘要:

AbstractThe development of design criteria for a waste water treatment plant is described. Operating results for a laboratory activated sludge unit, a Dowpac trickling filter pilot plant, and an aero‐accelator activated sludge pilot plant are given. Studies with the aero‐accelator pilot unit indicated that by observing certain critical nutrient and dilution requirements the industrial effluent, containing toxic 2,4‐D waste water, could be satisfactorily treated by bio‐oxidation. A phenol removal of 99% and a biochemical oxygen demand (B.O.D.) removal of 90% to 95% was obtained. In the full scale treatment plant, the estimated cost of operation was calculated at $0.50 per pound of phenol removed, and $0.08 per pound of B.O.D.

ISSN:0008-4034    

DOI:10.1002/cjce.5450370502

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1959

数据来源: WILEY

摘要:

AbstractDetailed studies of the air and solid flow patterns in a spouted wheat bed have been made in column sizes up to 2 ft. in diameter. Orifice size, cone angle, bed height and air flow were varied so as to establish their effect on these flow patterns. Air flow within the bed was obtained from pressure drop gradients, and solid flow was obtained from particle velocity measurements taken at the wall. Pressure drop, air flow distribution between spout and annulus, solid circulation rate and flow line data are summarized. A correlation is proposed which relates pressure drop and particle velocity at the top of the bed with superficial air velocity at air flows above minimum spouting. Particle velocity measurements in the spout were made from photographs, and were calculated approximately from the drag equation for a single particle.

ISSN:0008-4034    

DOI:10.1002/cjce.5450370503

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1959

数据来源: WILEY

摘要:

AbstractIn the literature, when the available integrated forms of the Gibbs‐Duhem equation are employed for extrapolating vapor‐liquid equilibrium data at isobaric conditions, the relative partial molal enthalpies at constant liquid compositions, L, are assumed either to be zero or to be independent of temperature. An investigation of the temperature effect on heats of mixing for non‐ideal solutions reveals that these assumptions are invalid and that the quantity L varies linearly with temperature. Therefore the liquid activity coefficients at constant compositions should involve three temperature terms of the form a + (b/T) + c log T for extrapolating purposes. As a result, more general equations are pro

ISSN:0008-4034    

DOI:10.1002/cjce.5450370504

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1959

数据来源: WILEY

摘要:

AbstractThe removal of droplets from a dioctyl phthalate mist by a fluidized bed of silica gel was studied. The mist used had a narrow range of droplet diameters, which averaged 0.87 microns in size. Silica gel particles were in the range of −150 mesh to +200 mesh.It was found that removal efficiencies were only slightly affected by a 50% change in inlet mist concentration, or by a 300% variation in depth of the fluidized bed. Collection efficiencies varied from about 90% at low superficial gas velocities to 70% at high velocities.It is shown from these results that collection is primarily by particle diffusion. Results can be correlated in terms of equations for mass transfer in fluidized beds. The possible uses of a fluidized bed as a collecting device are discusse

ISSN:0008-4034    

DOI:10.1002/cjce.5450370505

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1959

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450370506

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1959

数据来源: WILEY