ISSN:0145-7632    

DOI:10.1080/01457638008939564

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

An analytic method is developed to describe the flow in each row of tubes of an air-cooled one-pass isothermal condenser. This leads to a better understanding of some common steam condenser problems, including freezing of condensate, rapid tube-side corrosion, and worse performance than predicted by any reasonable condensing coefficient. The NTU approach is used to derive expressions for pressure drop in each row in terms of exchanger effectiveness. The resulting simultaneous equations are solved numerically, and the solutions, presented graphically, show the flow pattern to be solely a function of effectiveness. For steam condensers contaminated by traces of air, it is found that air pockets will develop inside the tubes of the lower rows, blanketing the surface and preventing condensation. Several designs are described that attack the problem of noncondensable accumulation, including the most recent developments in the air-cooled condenser field.

ISSN:0145-7632    

DOI:10.1080/01457638008939565

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

The heat transfer performance for heating water in turbulent flow was experimentally determined for II tubes having integral internal spiral and longitudinal fins. Eight of these tubes were previously tested with air and results have previously been reported. Individual tube performance is presented and compared with a smooth tube datum at constant pumping power. A longitudinal and spiral fin tube from within the II tubes and a smooth tube were also tested heating a 50% w/w ethylene glycol-water solution, and these data are included. These data are compared with relevant data available in the literature. Correlating equations are presented for heat transfer and Fanning friction factor that describe the air, water, and ethylene glycol-water data within ± 10%

ISSN:0145-7632    

DOI:10.1080/01457638008939566

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

The effect of the use of scrapers on the film heat transfer coefficient was investigated. Experimental runs were conducted in liquid-full, continuous-flow heat exchangers of commercial size, with a 6-in. ID and 6-ft length. Three test fluids were used: two petroleum lube fractions and corn syrup. Flow rates were varied from 0.8 to 5.8 gpm and the scraper speed from 0.5 to 25 rpm. The data collected were utilized in developing a design correlation in the laminar regime (Rer < 150). The correlation obtained for heating and cooling was Nu = 57 Ref0.059Rer0.113Pr0.063Visr−0.018, for 0.0016 < Ref < 9.23 and 0.0164 < Rer< 68.65.

ISSN:0145-7632    

DOI:10.1080/01457638008939567

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

The fundamental heat transfer processes that occurred during the Three Mile Island unit 2 accident are reviewed. Emphasis is placed on the elements that might have been overlooked during the design and operation of the power plant.

ISSN:0145-7632    

DOI:10.1080/01457638008939568

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

Heat transfer rates for a variety of finned tubes in water and asphalt-water emulsion were determined experimentally. From these data, free convection heat transfer coefficients on the outside of the tube were calculated as a function of the Rayleigh number. A correlation of the form Nu = C1(Ra)C2was then determined by a least-squares fit of the data.

ISSN:0145-7632    

DOI:10.1080/01457638008939569

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor