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Monday, May 4, 2020 | History

1 edition of An experimental study of filmwise condensation on horizontal enhanced condenser tubing found in the catalog.

An experimental study of filmwise condensation on horizontal enhanced condenser tubing

Huseyin Ciftci

An experimental study of filmwise condensation on horizontal enhanced condenser tubing

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  • 6 Currently reading

Published by Naval Postgraduate School in Monterey, California .
Written in English

    Subjects:
  • Mechanical engineering

  • Edition Notes

    SeriesNPS 69-79-014
    ContributionsNaval Postgraduate School (U.S.)
    The Physical Object
    Pagination1 v. :
    ID Numbers
    Open LibraryOL25512109M

    Results show that for same twist ratio Y=5, baffled tape creates more swirl generations in steam path as compared to simple tape resulting in providing more contact area for heat exchange process thus ultimately causing slight enhancement in condensation heat transfer rate of steam at the expense of reasonable pressure drop. the entrance region are given in the paper. Experimental investigation of heat transfer in the entrance region for the turbulent film was performed. The description of experimental set-up is presented. The research has been carried out with water film falling down a surface of vertical tube as Reynolds number ranged from to This banner text can have markup.. web; books; video; audio; software; images; Toggle navigation.


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An experimental study of filmwise condensation on horizontal enhanced condenser tubing by Huseyin Ciftci Download PDF EPUB FB2

An experimental study of the convective condensation and evaporation performance of two enhanced surface heat transfer tubes and a smooth tube was carried out at the saturation temperatures of 45 °C and 6 °C.

Frictional pressure drop and mean heat transfer coefficients were presented, with the following conclusions being made: (1)Cited by: In this study, we conducted air-cooled condensation experiments inside bare and tetrafluoroethylene (TFE)-coated Pyrex glass tubes.

Using infrared thermometry and side-view visualization with a charge-coupled device (CCD) camera, high-resolution local wall temperature distributions on the tubes and the formation of filmwise and dropwise condensation inside the tubes could be by: Dropwise and filmwise condensation Saurabh pandey Abstract—.The paper reviews progress in dropwise condensation research from to the present.

Particular attention is given to heat transfer measurements, theory, effect the presence of air in the condenser has on the heat flux and surface heat transfer Size: KB. This paper deals with an experimental study of heat transfer during condensation of R vapour on horizontal integral-fin (HIF) tubes.

R is a substitute for R, which is required to be. Cheng B, Tao WQ () Experimental study of Ra film condensation on single horizontal smooth tube and enhanced tubes. J Heat Transf (1)– CrossRef Google Scholar Cheng WY, Wang CC Huang LW () Film condensation of HCFC on horizontal enhanced tubes, Int Comm Heat Mass Transf 23(1): pp.

79–90 CrossRef Google Scholar. An experimental study of heat transfer and flow regimes during condensation of refrigerants in horizontal tubes was conducted. An experimental study of filmwise condensation on horizontal enhanced condenser tubing book Measurements were made in smooth, round tubes with diameters ranging.

Abstract. The problem of wavy filmwise condensation was recently investigated using both analytical and numerical concepts. The analytical solution assumed the film profile as a simple sinwave moving with a constant phase velocity and the problem was reduced to a closed integral by: 2.

Vapour may condense onto a cooled surface in two distinct modes known as filmwise and dropwise. For the same temperature difference between the vapour and the surface, dropwise condensation is several more times effective than filmwise.

However it. of tube geometry in condensation has been studied by many researchers with different working fluids such as water, R, R, R, R, methanol, ethanol [5] and Ra [6]. Wilson et al. [7] conducted an experimental study on the effect of different tube geometry in condensation heat transfer.

NOMENCLATURE. @article{osti_, title = {Condensation heat transfer of steam on a single horizontal tube. Master's thesis}, author = {Graber, K A}, abstractNote = {An experimental apparatus was designed, constructed and instrumented in an effort to systematically and carefully study the condensation heat-transfer coefficient on a single, horizontal tube.

Dropwise and filmwise condensation. Saurabh pandey. Abstract —. The paper reviews progress in dropwise condensation research from to the present. Particular attention is given to heat transfer measurements, theory, effect the presence of air in the condenser has on the heat flux and surface heat transfer coefficient.

An experimental facility was developed to investigate boiling and condensation heat transfer in horizontal mini channel. A schematic diagram of the test facility is shown in Fig. The experimental system consists of a forced circulation loop. The main part of the loop has a pump, a pre heater, condenser and a test section.

The refrigerantAuthor: Yasuhiro Kudo, Kyosuke Nakaiso, Keishi Kariya, Akio Miyara. Transport Phenomena in Multiphase Systems by A. Faghri & Y. Zhang 2 Chapter 8: Condensation In order to use boundary layer theory to describe the condensation problem, the following assumptions must be made: 1.

Tw, TI, Tv∞, ωlv∞, uvI, u I and uv∞ are independent of x. THE EFFECT OF A NOVEL COATING TECHNIQUE ON FILMWISE AND DROPWISE CONDENSATION OF STEAM ON HORIZONTAL TUBES Helen P. Kilty Lieutenant, United States Coast Guard B.S., United States Coast Guard Academy, Submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN MECHANICAL ENGINEERING Author.

) investigating the influence of condensation film on condensation heat transfer in tubes. When condensation occurs on horizontal and short vertical plates, condensate film motion is generally laminar. On vertical tubes and long vertical plates, film motion can become turbulent. Grober et al. () suggested that a Reynolds number.

Design and Construction of a Condensation Heat Transfer Experimental Facility for Use with Microchannel Condenser Tubing ACRCTR For additional information: Air Conditioning and Refrigeration Center University of Illinois Mechanical & Industrial Engineering Dept.

West Green Street Urbana, II. () D. Andres and W. Dunn. FILMWISE CONDENSATION FIG.2 FIG.3 in filmwise condensation, the new condensate formed joins the liquid film formed on the surface previously and this increases the film thickness.

In film condensation the liquid condensate forms a continuous film, which covers the surface and takesFile Size: KB. Characterization of mass transfer by condensation on a horizontal plate.

Other. Filmwise condensation 35 Theoretical developments 35 Effect of variable physical properties 36 Effect of non-condensable gases 39 Experimental developments Experimental Study on Condensation Heat Transfer in Vertical Minichannels for New Refrigerant Rze (E) Versus Ra and Rfa.

Experimental Thermal and Fluid Science, 35, – [41] Park, C.Y., & Hrnjak, P. Inside Horizontal Tubes. As condensation occurs inside a horizontal tube, some liquid pools in the bottom. This reduces the flow area and changes heat transfer. To account for this, the gravity driven condensation equation becomes As with vertical tubes, the designer should use the larger of the gravity or vapor shear controlled forms.

Turbulent film condensation of pure vapors flowing normal to a horizontal condenser tube - constant heat flux at the tube wall Figure 1.

Physical configuration-flow model Analysis The case Wiv 0 happens to be Nusselt’s analysis. In Eq. (2), the influence of inertial force is neglected. z P z P z P ∆ ∆ − ∆ ∆ = ∆ ∆f m, () L 2 2 V m 1 1 ξρ ξρ G x G x z z P (3), (4) where ∆P is the measured pressure drop, ∆Pm is the pressure drop due to momentum change, ξ is the void fraction, ∆z is the distance between the neighboring pressure measuring ports, and ρL and ρV are the densities of refrigerant liquid and vapor, respectively.

The void fraction is estimated. For the smooth tube, the heat transfer coefficient of horizontal tube is three times that of flash distillation and twice that of a vertical tube evaporative device [3]. The high heat transfer coefficient of horizontal tube falling film evaporator, the required heat load of the same heat transfer area can be greatly Size: KB.

orientation (horizontal and vertical) and according to the placement of the condensing vapor (shell-side and tube-side). This project deals with vertical shell-and-tube condensers with tube-side condensation. Calculations of the overall heat transfer coefficient necessary for the design of the condenser heat transfer area are well.

experimental-analytical data. Popov [15] was the first to study the condensation for horizontal surfaces; however the first proper model for heat transfer prediction on the upper side of a horizontal plate was introduced by Nimmo and Leppert [16, 17]. They assumed that the.

the case of condensation of saturated vapor on a horizontal plate facing upward, has recently been derived by Clifton and Chapman (11). Experiments have been performed which verify the theoretical predictions for liquids with Pr> (12). However, in the case of liquid metals, the experimental heat transfer coefficients were found.

Convective Condensation in Tubes Two-Phase Flow Regimes Convective Condensation in Tubes (b) Lower mass flow rate F i g u r e 1 1.

1 0 Flow patterns for condensation inside horizontal tubes. (a) Higher mass flow rate. Transport Phenomena in Multiphase Systems by A.

Faghri & Y. Zhang 2 Chapter Two-Phase Flow. Condensation heat transfer has been evaluated experimentally on the tube side of three different circular tubes with inner diameter ofand mm, respectively.

Two-phase fluid flow conditions include mass fluxes from to kg/m2s, qualities between toand heat flus range of 5 to 20kW/m2 at a fixed saturation temperature of 48°: Pham Quang Vu, Nguyen Ba Chien, Oh Jong Taek. S.N. Sapali et al /International Journal of Engineering Science and Technology Vol.1(2),46 tubing [see Fig for actual photograph].

For this it is important to know the flow condensation heat transfer coefficients (HTCs) of a working fluid in a horizontal tube for air-cooled condensers. different modes. It should be noted that in the present study the liquid sheet falling between horizontal tubes mode is considered.

Scope of the present study The main objective of this study is improving the evaporation rate in the horizontal tube evaporators by spraying water upon the hot surfaces.

The present analytical work. entering the condenser about oC and oC of the condensing temperature. Furthermore, COP was improved with a range from % to %. A finned tube heat exchange and an air flow containing water droplets during experimental study has been examined by [7]. An experimental setup consist of a.

ABSTRACT In this experiment, we want to study the heat transfer coefficient and the heat flux. The main components in the unit are the specially designed condensers for the observation differences of both filmwise and dropwise condensation.

This Film and Dropwise Condensation Unit is used to observe the process of heat transfer during condensation, as well as gather experimental data for a.

When put together the various paints and tubing would have done the job when heated by the steam though. In fact the box sat sealed with the condenser tubing in it for the days I was working on the boiler.

Lets see; the original paint which had been heated in areas for soldering, a spray primer, an oil base paint, RTV silicone and the coolant. The effects of liquid load, tube diameter, evaporation boiling point, condensation temperature difference and steam flow velocity on the heat-transfer film coefficients inside horizontal tubes were studied.

The experiments wer Conclusion A study on the condensation heat-transfer coefficient h(")1 inside a smooth red copper tube was made.

Experimental Study of Free Convection in Coiled Tube Heat Exchanger with Vertical Orientation Harith Noori Mohammed, Assistant Lecturer Chemical Engineering Department-Tikrit University Abstract An experimental study has been conducted on steady-state natural convection heat transfer from helical coil tubes in vertical orientation.

any difference between the two. The study is illustrated by reference to experimental data5 ⎪ obtained from the first condensing row of a steam condenser, condensing filmwise, pressure 50 mb, approach velocity Vmin=10 m/s and heat fluxes kW/m2.

It explores the role of the level of random errors in data measurement on the accuracy of the. In this study, a computational model has been developed to predict condensation heat transfer between vertical parallel plates.

Transient simulations of filmwise condensation in a small two-dimensional parallel plate passage are performed. The Volume of Fluid (VOF) method is. The film condensation process on a cooled surface resulting from the condensation of water vapor from humid air is considered for a horizontal flat plate (area 25 [2]).

Condensation modeling during automotive lighting product development using CFD simulation. Filmwise condensation occurs on a vertical or horizontal plane when a film of condensate is formed on surface and flows by action of gravity.

Dropwise condensation occurs when small drops formed on surface. Cooling water is circulated through the filmwise condenser starting with a minimum value of LPM.

5 2. The heater power is adjusted 5/5(5). Title: Experimental Studies of Heat Transfer with an Array of Horizontal Tubes Immersed in a High-Temperature Fluidized Bed Abstract approved: Redacted for privacy (James R.

Welty) An experimental study is described in which time-average local heat transfer coefficients were obtained for arrays of horizontal tubes immersed in a hot fluidized bed. Influence of Water/Hydrocarbons Co-Condensation on Top of the Line Corrosion.

A dissertation presented to. and co-condensation processes(ii) experimental study of, corrosion in a co-condensation. 4 filmwise condensation of water vapor.

For the corrosion process, the model included theFile Size: 11MB.experimental data. These include fluids water, R, R, R, R, methanol, ethanol, benzene, toluene, and trichloroethylene condensing in horizontal, vertical, and inclined pipes of diameters ranging from 7 to 40mm.

One data set for condensation inside an annulus has also been analyzed. The range ofFile Size: KB.Numerical Study of Laminar Film Condensation inside a Vertical Tube Subjected to Wall Non Uniform Heat Flux presented a study for laminar film condensation of the water vapor, in the presence of non– performed an experimental study of combined heat .