1 edition of Further studies in filmwise condensation of steam on horizontal finned tubes found in the catalog.
Further studies in filmwise condensation of steam on horizontal finned tubes
Keith Andrew Swensen
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||127 p. ;|
|Number of Pages||127|
pressure drop in horizontal tube 34 chapter 3 theory introduction 35 heat transfer 35 mass transfer 37 basic aspects of two phase flow and heat transfer in horizontal tubes 42 properties of mixtures 46 development of an equation forheat transfer 51 development of formulae used inevaluating. Transport Phenomena in Multiphase Systems by A. Faghri & Y. Zhang 13 Chapter 8: Condensation Heat flux across the film thickness () Heat transfer rate per unit width for the control volume () where. Latent heat effects of condensation dominate the process () dΓ is found by differentiating the expression for mass flow rate per.
CONDENSATION OF STEAM ON MULTIPLE HORIZONTAL TUBES Makas, Aytaç M.S., Department of Mechanical Engineering Supervisor: Assoc. Prof. Dr. Cemil Yamalı April , pages The problem of condensation of steam on a vertical tier of horizontal tubes is investigated by both analytical and experimental methods in this study. A computer. Film wise and Drop wise condensation are nothing but two different results of condensation of vapor/steam when gets into contact of cooled surface. 1. In film wise condensation, the cooled surface is smooth and friction-less which results in quick.
exchange of heat during dropwise and filmwise condensation. This unit contained with an integrated steam generator boiler and steam extraction through control valve to the chamber tubes. Condensation of steam on the surface of tubes causes heat transferred from steam to tubes . Due to this placement of the suction pipe in the center of the tube nest, the exhaust steam flows radially inward over the tubes towards the suction pipe. The condensate is collected at the bottom of the condenser and pumped to the hot well. We can say that it is the improved form of the down flow surface condenser.
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Calhoun: The NPS Institutional Archive Theses and Dissertations Thesis Collection Further studies in filmwise condensation of steam on horizontal finned tubes.
Over the years, there has been significant variation in the filmwise steam condensation data at NPS on horizontal low-integral finned tubes.
With a view to increasing the accuracy of the data, inserts were used inside the tubes to reduce inside thermal resistance; however, significant discrepancies then occurred in the calculated outside heat-transfer coefficient when compared to data taken. Thesis advisors, P.J. Marto and Stephen Memory.
Film condensation occurs when the temperature of a vertical, impermeable, and wettable wall next to a porous medium saturated with vapor falls below saturation temperature (Fig. ).In addition to gravity-driven downward liquid flow, the liquid also infiltrates the vapor region due to capillary force.
The latter will create a two-phase region between the liquid film and the vapor region. Further studies in filmwise condensation of steam on horizontal finned tubes. there has been significant variation in the filmwise steam condensation data at NOS on horizontal low0integral finned tubes.
With a view to increasing the accuracy of the data, inserts were used inside the tubes to reduce inside thermal resistance; however Author: Keith Andrew Swensen. The film condensation heat transfer performance of six externally finned copper tubes has been evaluated. All tubes had rectangular-shaped fins with a height and thickness of 1 mm.
The spacing between fins was,and mm. Data were also obtained for a smooth tube whose outside diameter of mm was equal to the. Recently, in order to improve the steam condensation heat transfer performance in the presence of air, Tong et al  conducted experiments on vertical longitudinal finned tubes.
However, the. Over the years, there has been significant variation in the filmwise steam condensation data at NPS on horizontal low-integral finned tubes.
With a view to increasing the accuracy of the data, inserts were used inside the tubes to reduce. Filmwise condensation measurements of steam were made on horizontal finned tubes under vacuum and near-atmospheric conditions.
Data were obtained for copper tubes with fins of rectangular, triangular, trapezoidal, and parabolic cross sections, and for a commercially-available finned tube.
The geometrical parameters of all the specimens investigated are summarized in Table surfaces with longitudinal fins are named R1 and R1 fin has a rectangular cross-section of width (d b) and height (l) of mm and mm, respectively whereas the T1 fin has a triangular cross-section with the base width (d b) of mm and the same height as the R1 fin of mm.
Augmentation of horizontal in-tube condensation of steam John Henri Royal Iowa State University Follow this and additional works at: THE FINNED TUBES 99 Introduction 99 Background 99 Dropwise Condensation Studies Filmwise Condensation Studies Filmwise condensation is expected to occur in most instances because the formation of dropwise condensation IS greatly influenced by the presence of non-condensable gases, the nature and composition of surfaces and the velocity of vapour past the surface.
Filmwise Condensation Mechanism on a Vertical Plane Surface-- Assumption. same temperature difference between the steam & the sur-face, dropwise condensation is much more effective then filmwise condensation & for this reason the former is desirable although in practical plants it rarely occurs for prolonged periods.
In filmwise condensation a laminar film of vapour is created upon a surface. Experiments have been performed to study the effects of air on filmwise condensation from steam-air mixtures undergoing forced flow over a 3/4 in.
OD horizontal tube. Local condensation rates at the stagnation point are reported for saturation temperatures of – deg F, bulk to wall temperature differences of 3–30 deg F, bulk air mass.
This paper presents a few salient features of an investigation carried out to study the heat transfer augmentation during condensation of water and Ra vapor on horizontal integral-fin tubes.
An illustration of a horizontal line over an up pointing arrow. Upload Log in. An illustration of a computer application window Wayback Machine. An illustration of an open book. Books. An illustration of two cells of a film strip. Video. An illustration of an audio speaker.
Filmwise condensation of steam on externally-finned horizontal. (). CONDENSATION HEAT TRANSFER OF STEAM ON VERTICAL DROPWISE AND FILMWISE COEXISTING SURFACES WITH A THICK ORGANIC FILM PROMOTING DROPWISE MODE.
Experimental Heat Transfer: Vol. 16, No. 4, pp. An experimental study on the role of non-condensable gases in the condensation of steam inside slightly inclined tubes was presented by Caruso et al. The experiments were carried out under the following conditions: inner diameter of the tube and mm, inclination of the tube 7°, mass fraction of the non-condensable gas between 5 and.
On the other hand, the sinusoidal fin geometry of Specimen S 1 promoted the draining of the condensate film from the fin tip to the fin base which significantly improved heat transfer near the fin tip. In comparison with the plain surface, enhancement factors (η) of and were achieved with Specimens C 1 and S 1, respectively.
EXPERIMENTAL STUDIES ON STEAM CONDENSATION IN HORIZONTAL AND VERTICAL MICROTUBES. Sadaghiani AK. Motezakker.A Ko. şar. with different twisted ratios of 6, 9, 12 and 15  and micro-fin tubes  have been used due to their high condensation heat on condensation heat transfer in inclined tubes for Ra was investigated by Meyer et al.
Film wise condensation. In film wise condensation, the surface over which the steam condenses is wet-able and hence, as the steam condenses, a film of condensate is formed.
Generally, film wise condensation results in low heat transfer rates as the film of condensate impedes the heat transfer. Steam and steam-air mixtures were condensed on bundles of in-line, titanium tubes. The row-by-row heat transfer coefficients are presented against bundle position.
They show the expected behavior for filmwise condensation but demonstrate a different one for dropwise.Honda, H., Nozu, S.
and Mitsumori, K. () Augmentation of Condensation on Horizontal Finned Tubes by Attaching a Porous Drainage Plate.
Proc. ASME-JSME Thermal Engng. Joint Conf., 3, Honda, H. and Nozu, S. () A Prediction Method for Heat Transfer during Film Condensation on Horizontal Integral Fin Tubes. J. Heat Transfer,