Accession Number:

AD0694752

Title:

FRICTION AND HEAT TRANSFER IN TWISTED FLOW INSIDE A PIPE,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

• Migai,V. K.

Report Date:

1969-05-14

Pagination or Media Count:

14.0

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

Descriptors:

• (*TURBULENCE
• *HEAT TRANSFER)
• (*SKIN FRICTION
• PIPES)
• VORTEX GENERATORS
• EFFICIENCY
• PRANDTL NUMBER
• USSR

Subject Categories:

• Fluid Mechanics
• Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE