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1 edition of Condensation heat transfer of steam on a single horizontal tube found in the catalog.

Condensation heat transfer of steam on a single horizontal tube

Kenneth A. Graber

Condensation heat transfer of steam on a single horizontal tube

  • 231 Want to read
  • 40 Currently reading

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

    Subjects:
  • Mechanical engineering

  • ID Numbers
    Open LibraryOL25462735M

      This textbook is intended for courses in heat transfer for undergraduates, not only in chemical engineering and related disciplines of biochemical engineering and chemical technology, but also in mechanical engineering and production engineering. The author provides the reader with a very thorough account of the fundamental principles and their applications to Reviews: 2. Fig. 8. Variation of heat transfer coefficients from top of tube for steam-only runs. Fig. 9. Variation of condensate heat transfer coefficients from top of tube for steam-only runs. relatively small increments and the temperature profile in each stream is essentially linear. The latter assumption was used to obtain a relationship between gas. Heat exchangers; Steam, steam processes Ron Zevenhoven Åbo Akademi University Horizontal / condensation on the outside of the tubes 2. Vertical / condensation on the outside of the tubes comparing the actual heat transfer with the maximum possible for the given geometry and material Size: 2MB. Dropwise condensation on a long vertical pipe Joseph Toa Seng Ma the mechanism of heat transfer by dropwise condensation. The load is negligible, but the effect of steam velocity is that the heat transfer coefficients increase with increasing ve­ Author: Joseph Toa Seng Ma.

    We have several shell and tube heat exchangers ranging from 10 mt2 to 70 mt2 (Horizontal installations).The process fluid is generally organic cooling fluid is CT water at about 27degC. The cooling water is passed inside the tubes in 2 or 4 process fluid is a single pass on shell side.


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Condensation heat transfer of steam on a single horizontal tube by Kenneth A. Graber Download PDF EPUB FB2

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. A smooth, thick-walled copper tube of length mm, with an outside diameter of mm and an inside diameter of mm was instrumented with six wall.

Calhoun: The NPS Institutional Archive Theses and Dissertations Thesis Collection Condensation heat transfer of steam on a single horizontal tube.

Condensation heat transfer of steam on a single horizontal tube. Item Preview remove-circle Share or Embed This Item. Condensation heat transfer of steam on a single horizontal tube.

by Graber, Kenneth A. Publication date Pages: Condensation heat transfer of steam on a single horizontal tube. Condensation heat transfer of steam on a single horizontal tube. by Graber, Kenneth A. Publication date TZ Topics Mechanical engineering Publisher.

An experimental test facility capable of investigating plain and enhanced horizontal tubes was built. The test facility consists of an electric boiler, test condenser and associated piping for steam, condensate, and cooling water.

Performance of the test condenser was checked at a steam pressure of 3 psia with cooling water velocities ranging from 5 to 25 ft/sec. Condensation. correlation for the heat transfer coe cient on the steam side [5] can be used.

Equation 6 represents correlation for heat transfer coe cient on steam side h v on a single tube. h v = k c d o " r0(ˆ c ˆ s) g d3 o (t s t t) k c ˛ c # (6) During condensation on a tube bundle, the con-densed water from the above tubes inundates the.

An implicit finite difference scheme is Condensation heat transfer of steam on a single horizontal tube book to solve the problem of condensation of pure vapors flowing vertically downwards around a horizontal tube.

The incompressible flow equations coupled at the interface for the liquid and vapor phases are by: In the gravity dominated flow regime, the dominant heat transfer mode was laminar film condensation in the top of the tube.

This regime was characterized by heat transfer coefficients that depended on the wall-to-refrigerant temperature difference but were nearly independent of mass by: condensation of steam-air mixtures in a horizontal effects of inlet fluid temperature,air mass concentration and tube diameter on the rate of condensation were investigated.

It was found that condensation heat transfer coefficient drops by approximately 50% within an air mass of 3% and there after the drop in the heat transfer.

MechHEAT TRANSFER HOMEWORK Solutions. (Problem in the Book) A horizontal tube of mm outer diameter, with a surface temperature of 34oC, is exposed to steam at bar. Estimate the condensation rate and heat transfer rate per unit length of the Size: KB. The dependence of the equivalent radius of a threshold channel on the diameter of particles during combined action of capillary and mass forces is experimentally obtained.

Experimental data on heat transfer during steam condensation on a horizontal tube placed in well- and partially wettable granular layers are presented.

It is shown that no enhancement of heat transfer Cited by: 2. Available from UMI in association with The British Library. This thesis presents an experimental and theoretical investigation into the effect of vapour shear on the condensation of steam flowing vertically downwards over a single horizontal tube and a horizontal tube in a row.

Honda and Fujii's conjugate heat transfer analysis has been adapted and modified to take Author: Azzeddine Aoune. This feature is not available right now. Please try again later. Heat Transfer L30 p2 - Example - Condensation on a Horizontal Tube Bundle Heat Transfer L30 p1 - Condensation - Horizontal Tubes and Spheres - Duration: Heat Transfer L28 p3 - Condensation.

Heat transfer in tube condensation process involves conduction as well as convection. Heat will conduct from inside of tube to its outside surface irrespective of its alignment in space.

But, for effective convection, tube surface area should be exposed more. Which is achieved by placing it horizontally. Towards the outlet of the condenser tube, most of the steam has been condensed and the predominant heat transfer mechanism changes from condensation heat transfer to single-phase gas cooling by forced convection at the top of the tube.

At the bottom of the tube, the heat transfer mechanism is forced convection through the by: Direct contact condensation heat transfer (DCCHT) of saturated steam to subcooled liquid spray has been of great interest to researchers for its application possibilities in modern industries.

Pressure-swirl nozzles are usually used to spray the subcooled liquid into the saturated steam. Condensation heat and mass transfer of steam with non-condensable gases outside a horizontal tube under free convection.

International Journal of Heat and Mass Transfer, DOI: /masstransferCited by: Past literature shows condensation of steam inside the tube or tube bundle having tube inner diameter is about 15 to 40 mm and length is about to mm. up to now all literature for L/di ratio is less than No such literature is present for L/di is more than Chapter Boiling and Condensation1 1Based on lecture by Yoav Peles, Mech.

Aero. Nuc. Eng., RPI. • Calculate the heat flux associated with condensation on inclined and horizontal plates, vertical and horizontal cylinders or spheres, and tube bundles, – a sharp decrease in the heat transfer coefficient • Vapor single-phase flowFile Size: 2MB.

Augmentation of horizontal in-tube condensation of steam A Dissertation Submitted to the Graduate Faculty in Partial Fulfillment of The Requirements for the Degree of DOCTOR OF PHILOSOPHY Major: Mechanical Engineering by John Henri Royal In Charge of Major #ork Iowa State University Ames, Iowa Signature was redacted for privacy.

transfer coefficient for pure steam. The condensation heat transfer coefficient obtained stratified flow inside a horizontal tube the analogy between liquid film flow and single phase.

Preliminaries. The condensate loading on a tube is the mass flow of condensate per unit length that must be traversed by the draining fluid. The length dimension is perpendicular to the direction the condensate flows; the perimeter for vertical tubes, the length for horizontal tubes.

Briggs A, Wang HS, Murase T, Rose JW () Heat transfer measurements for condensation of steam on a horizontal wire-wrapped tube.

J Enhanc Heat Transf 10(4) CrossRef Google Scholar Brower SK () The effect of condensate inundation on steam condensation heat transfer in a tube bundle. Heat-transfer measurements were made during film condensation of steam on a plain copper tube and on nine similar tubes which were spirally wrapped with.

For the case of condensation from steam–air mixtures, the single-tube data gave good agreement with theory. For condensation from steam–air mixtures on the bank of tubes, the data were significantly under predicted by single-tube theory, possibly because of mixing and re-circulation due to the complex flow pattern around the tubes.

(1) where is the net condensation mass flux, P v is the vapor pressure, P sat (T s) is the saturation pressure at the liquid surface temperature, T s and R is the specific gas constant of the vapor.

ξ is a dimensionless quantity of order unity, and can be considered as an interface mass transfer coefficient.

Condensation in Forced Convection. As shown in Figure 1, in the inlet region of a horizontal condenser tube the volume flow rate of superheated vapor is usually high, and the flow pattern is single-phase vapor flow.

If the temperature of the vapor decreases below saturation temperature near the cooling tube wall. Condensation heat transfer of steam on a single horizontal tube. By Kenneth A. Graber.

Download PDF (6 MB) Abstract. Approved for public release; distribution is unlimitedAn experimental apparatus was designed, constructed and instrumented in an effort to systematically and carefully study the condensation heat-transfer coefficient on a single Author: Kenneth A.

Graber. Figure 4 to 7 show that for all combinations of correlations two observations can be made: condensate heat transfer coefficient varies from a high on the first tube to a minimum on the last tube; and condensate heat transfer coefficients are highest with n-butane, followed by Ra, Rfa, and are lowest for R and isobutene; plots of values Cited by: 1.

Steam Condensation in the Presence of a Noncondensable Gas in a Horizontal Tube, Evaporation, Condensation and Heat transfer, Amimul Ahsan, IntechOpen, DOI: / Available from: O IntechOpen readers like this topic. Help us write another book on this subject and reach those readers Cited by: 6.

The film condensation heat transfer coefficient ℎ 𝑓, instead, is given from a modification of the Nusselt’s theory for laminar flow of a falling film outside a horizontal tube (around the perimeter, from top to bottom) applied indeed to the condensation on the inside.

Any effect of axial shear on the falling film is by: 8. Steam will condense and give up its enthalpy of evaporation on the walls of any pipe or tube exposed to ambient air.

In some cases, such as steam mains, heat transfer is minimised by the lagging of the pipes. In other cases such as air heater batteries, heat transfer may be promoted by the use of fins on the outside of the pipes. correlation for saturated boiling heat transfer [S] by noting the similarity between the mechanisms of heat transfer during film condensation and boiling with- out bubble nucleation (evaporation).

That cor- relation was developed by analyzing a vast amount of varied data from horizontal, verticat upflow, andFile Size: KB. LOCAL HEAT-TRANSFER COEFFICIENTS FOR CONDENSATION OF STEAM IN VERTICAL DOWNFLOW WITHIN A 5/8-INCH-DIAMETER TUBE by Jack H.

Goodykoontz and Robert G. Dorsch Lewis Research Center SUMMARY Local heat-transfer data were obtained for steam condensing in vertical downflow in- side a Size: 1MB. The condensation heat transfer process inside the horizontal tube is more complex due to the steam condensation and flow changes.

Factors, including two phase transformation, inter-atomic forces, and gravity, have a big impactFile Size: KB.

The first investigator to propose a theoretical model of condensation heat transfer on vertical plates and horizontal tubes was Nusselt [].By considering laminar flow and constant properties for the condensate film, uniform temperature on the vapour side (no temperature gradient in the vapour), and neglecting inertia, convection in the condensate film (i.e.

heat transfer across the condensate Cited by: 2. In this chapter, two-phase convection processes are examined.

Two-phase processes occur when the fluid is experiencing heat transfer near the vapor dome so that vapor and liquid are simultaneously present. If the fluid is being transformed from liquid to vapor through heat addition, then the process is referred to as boiling or : Gregory Nellis, Sanford Klein.

NOTES ON TWO‐PHASE FLOW, BOILING HEAT TRANSFER, AND BOILING CRISES IN PWRs AND BWRs wall of a PWR steam generator tube, JB / Fall etc.) is full of micro‐cavities, naturally present due to roughness, corrosion, etc. refer to any boiling heat transfer textbook (e.g.

Boiling, Condensation and Gas. Abstract. Accurate, repeatable heat-transfer data have been obtained for condensation of steam and CFC on integral-fin tubes made of copper, brass and bronze, with rectangular-section fins having fin spacing of 1 mm, fin heights in the range mm to mm and fin thicknesses in the range mm to mm; all other geometric parameters were the same.

The heat transfer rate in a condensing steam flow rate of 8 kg/h ( kg/s), atmospheric pressure and temperature oC - can be calculated as.

q = ( kJ/kg) ( kg/s) Sponsored Links. Steam Thermodynamics - Thermodynamics of steam and condensate applications. en: condensing condensation steam heat transferred transfer.

HEAT TRANSFER FROM CONDENSING VAPORS: Condensation of vapors on tube surfaces is cooler than condensing temperature of vapor for those such as water, hydrocarbon, and volatile substances are processed where latent heat of vaporization is removed for condensation to occur.

Heat transfer occurs between vapor and surface and condensation .Coils are discretised into tube elements for which the governing equations are solved using local values of temperature, pressure, physical properties and heat transfer coefficients. Single phase, condenser and evaporator cases can be treated using water, R22, Ra, and various refrigerant mixtures based on R32, R, and Ra.