Effect of Vapor Velocity during Condensation on Horizontal Finned Tubes

Abstract

Heat transfer measurements were made for condensation of R-113 and steam on a smooth tube and on three finned tubes with rectangular shape fins. These tubes had a fin height and width of 1.0 mm and spacings of 0.25, 1.5, and 4.0 mm (tubes A, B, and C respectively). Data were taken by increasing the vapor velocity from 0.4 to 1.9 m/s for R-113 and 4.8 to 31.3 m/s for steam. For both fluids, the improvement of the condensing heat-transfer coefficient with vapor velocity was smaller for the finned tubes than for the smooth tube. For R-113, the smooth tube experienced a 43 percent improvement with vapor velocity, whereas the finned tubes (tubes A, B and C respectively) experienced improvements of only 0, 5, and 10 percent. For finned tubes (tubes A, B and C respectively) experienced improvements of only 31, 11, and 9 percent. Condensation; Vapor velocity effects; Heat transfer coefficient; Finned tubes; Theses.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1988
Accession Number
ADA205072

Entities

People

  • Charles R. Hopkins Iii

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Chemistry
  • Condensation
  • Data Acquisition
  • Engineering
  • Heat Energy
  • Heat Transfer
  • Heat Transfer Coefficients
  • Hydrodynamics
  • Literature Surveys
  • Measurement
  • Measuring Instruments
  • Mechanical Engineering
  • Phase Transformations
  • Reynolds Number
  • Steady State
  • Thermodynamics

Fields of Study

  • Engineering

Readers

  • Combustion and Flow Dynamics.

Technology Areas

  • Space
  • Space - Hall-Effect Thruster