FRICTION AND HEAT TRANSFER IN TWISTED FLOW INSIDE A PIPE,

Abstract

Approximate calculations of the characteristics of heat exchange and friction during turbulent flow in tubes with band-type vortex generators are compared with experimental results obtained on an air unit. Graphs are given for hydraulic friction in tubes with band-type vortex generators, heat exchange in tubes with band-type vortex generators, effect of the Prandtl number on the efficiency of heat exchange in a turbulent flow, and power comparison of band-type vortex generators. The results show that band-type vortex generators are most efficient at relatively small values. On the other hand, wire type spiral vortex generators are more efficient at large values although band-type vortex generators are still preferable at low Reynolds numbers. (Author)

Document Details

Document Type
Technical Report
Publication Date
May 14, 1969
Accession Number
AD0694752

Entities

People

  • V. K. Migai

Organizations

  • National Air and Space Intelligence Center

Tags

DTIC Thesaurus Topics

  • Flow
  • Fluid Flow
  • Friction
  • Generators
  • Heat Transfer
  • Prandtl Number
  • Reynolds Number
  • Turbulent Flow
  • Vortex Generators
  • Vortices

Readers

  • Electrical Engineering
  • Fluid Dynamics.
  • Information Retrieval