1 edition of Enhanced condensation of R-113 on a small bundle of horizontal tubes found in the catalog.
Enhanced condensation of R-113 on a small bundle of horizontal tubes
Robert Walter Mazzone
by Naval Postgraduate School, Available from the National Technical Information Service in Monterey, Calif, Springfield, Va
Written in English
|Contributions||Marto, P. J., Memory, Stephen B.|
|The Physical Object|
|Pagination||220 p. ;|
|Number of Pages||220|
Correlations for these geometries were proposed. The use of microfin tubes for condensation application was extensively studied by Professor Bergles. Khanpara et al.  compared the performance of one plain and eight microfin tubes for in-tube condensation of R The heat transfer coefficients improved considerably over smooth tube values. Chemical Engineering Education Award Lecture the contact area to be independent of time, to be of radius R,, and to be open to a bundle of capillaries of radius r.. The surface is characterized by a fractional open area given by e=Nc Krd/7R (1) where Nc is the number of capillaries that open into the "footprint" of the drop.
Moeykens et al. (a) continued the above study, extending it to Ra and Ra/oil mixtures in single-tube tests at 2°C and tested four types of tubes: an enhanced pool boiling tube (Turbo-B), three enhanced condensation tubes (Turbo-Cii, Gewa-SC and Gewa-SE), two low fin tubes ( fpm/40 fpi, fpm/26 fpi) plus a plain tube, all. Antonelli, R. and O’Neill, P.S. ().Design and Application Consider ation for Heat Exchanger with Enhanced Boiling Surfaces, Paper read at In ternational Conference on Advances in Heat Exchangers, Dubrovnic, September. Arman, B. and Rabas, T.J. ().Disruption Shape Effects on the Performance of Enhanced Tubes with the Separation and Reattachment Mechanism, Enhanced Heat Transfer, .
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The results are presented of the model verification against the published experimental data on condensation on horizontal smooth tubes in a staggered tube bundle at a steam-air mixture pressure of.
Investigations have been carried out in a single tube horizontal condenser with 1 plain and 11 spirally enhanced tubes of varying pitch to depth ratio (p/d) of corrugation, for condensation of steam. Condensation heat transfer in a bundle of horizontal enhanced surface copper tubes (Gewa C+ tubes) has been experimentally investigated, and a comparison with trapezoidal shaped fin tubes with several fin spacing has been by: Honda H, Uchima B, Nozu S, Torigoe E, Imai S () Film condensation of R on staggered bundles of horizontal finned tubes.
J Heat Transf (2)– CrossRef Google Scholar Honda H, Takata N, Takamatsu H, Kim JS, Usami K () Effect of fin geometry on condensation of RC in a staggered bundle of horizontal finned tubes. Two-phase flow boiling from bundles of horizontal tubes with smooth and enhanced surfaces has been investigated.
Experiments were conducted in pure refrigerant R, pure R, and mixtures of R and R of approximat 50, and 75% of R by mass. Experimental results of a condensation row effect study on enhanced tubes are presented. A test cell was constructed to condense Refrigerant on the shell side of a vertical bank of five horizontal tubes.
Four distinctly different commercially available tubes were by: This paper surveys the evolution of power condenser tube bundle arrangements and examines present-day designs.
Condensation heat transfer during shell-side flow is reviewed, including the effects of vapor shear, condensate inundation, noncondensable gases, and enhancement techniques. The. The experimental apparatus, which consisted of a natural circulation loop of refrigerant and a forced circulation loop of cooling water, is schematically shown in Fig.
test section, shown in Fig. 2, was a 3×15 (columns×rows) staggered bundle of horizontal finned tubes made of odd rows consisted of three active tubes and the even rows consisted of two active tubes and dummy Cited by: The problem of inundation was first analysed theoretically for smooth tubes by Nusselt who considered an in-line column of horizontal tubes each with the same and uniform surface temperature.
For the case of laminar condensate flow, and neglecting inertia and convection in the condensate film, whose thickness was assumed much smaller than the tube radius, Nusselt obtained the dependence of Cited by: The augmentation of dropwise condensation is pointless, because the heat transfer coefficients are already so high.
It has been found that average coefficients for film condensation of steam on horizontal tubes can be improved up to 20 percent by strategically placing strips of teflon or other nonwetting material around the tube circumference.
Abstract. This concluding chapter deals with convective condensation. Forced condensation inside tubes, microfin tubes, flat tube automotive condensers, plate-type heat exchangers, the effect of non-condensable gases and correlative equations for circular tubes have been discussed. The map was validated for experimental data points of R and R condensation in horizontal tubes with diameters from mm to mm (see Figure 4).
Recently, Zhuang et al. [ 34 ] proposed a flow pattern map for R that considers effects of vapor inertia and liquid viscous as well as surface tension forces on the transition by: 2.
Back to Engineering Data Book III Home. «Chapter 8 Chapter 10». Table of Contents. Full text of "Condensers, Theory And Practice" See other formats. Kreith, F.; Boehm, R.F.; et.
“Heat and Mass Transfer” Mechanical Engineering Handbook Ed. Frank Kreith Boca Raton: CRC Press LLC, by CRC Press LLC c Heat and Mass Transfer Frank Kreith University of Colorado Robert F. Boehm University of Nevada-Las Vegas Full text of "E Book Mechanics Mechanical Engineering Handbook (CRC Pre" See other formats.
Issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online. Easily share your publications and get them in front of Issuu’s. Experimental Investigation and Prediction of Flooding during Reflux Condensation in a Small Diameter Inclined Tube.
Fiedler, S Pool boiling of butane from enhanced evaporator tubes. Mertz, R. / Kulenovic, R Simultaneous Visualization of Dry Spots and Bubbles for Pool Boiling of R on a Short Horizontal Heater. Chung, H.
/ Chun, S. Enhanced Condensation of R on a Small Bundle of Horizontal Tubes. DTIC Science & Technology. Anthony J. l lcaley, Ch an)epartment of Mechanic’ Engineering ABSTRACT Condensation of R was studied using an evaporator/ condenser test platform.
The IF FOR I=1 TO Npair5 ENTER @File;Xa,Ya S×=Sx+Xa Sy=Sy+Ya. His research focuses on flow boiling and single-phase heat transfer and fluid flow in microchannels, high flux cooling, and fundamentals of interfacial phenomena.
He has published over conference and journal papers, presented over 25 invited and keynote papers, has written contributed chapters in several handbooks, and has been editor-in.CRYOGENIC BOILING AND TWO-PHASE CHILLDOWN PROCESS UNDER TERRESTRIAL AND MICROGRAVITY CONDITIONS By Kun Yuan August Chair: Jacob N.
Chung Major Department: Mechanical and Aerospace Engineering Chilldown or quenching is a complicated process that initiates the cryogenic fluids transport, and it involves unsteady two-phase heat and mass transfer.Chang and Hsu  applied the modied Wilson plot method to analyze the condensation of Ra on two horizontal enhanced tubes with internal grooves.
The authors considered the functional form of the DittusBoelter equation  for the convection coecient of water owing inside the tubes and a constant thermal resistance for the condensing uid.