EXPERIMENTAL INVESTIGATION OF TURBULENT HEAT TRANSFER AND FLUID FLOW IN INTERNALLY FINNED TUBES WITH SURFACE ROUGHNESS

1998 ◽  
Author(s):  
Michael K. Jensen ◽  
Je H. Kim
Keyword(s):  
Heat Transfer ◽  
Surface Roughness ◽  
Experimental Investigation ◽  
Fluid Flow ◽  
Turbulent Heat Transfer ◽  
Turbulent Heat ◽  
Finned Tubes

Periodically Converging-Diverging Tubes and Their Turbulent Heat Transfer, Pressure Drop, Fluid Flow, and Enhancement Characteristics

1984 ◽  
Vol 106 (1) ◽  
pp. 55-63 ◽  
Author(s):  
P. Souza Mendes ◽  
E. M. Sparrow
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Surface Area ◽  
Equal Mass ◽  
Turbulent Heat Transfer ◽  
Turbulent Heat ◽  
Transfer Coefficients ◽  
Pressure Drops ◽  
Heat Transfer Coefficients ◽  
Friction Factors

A comprehensive experimental study was performed to determine entrance region and fully developed heat transfer coefficients, pressure distributions and friction factors, and patterns of fluid flow in periodically converging and diverging tubes. The investigated tubes consisted of a succession of alternately converging and diverging conical sections (i.e., modules) placed end to end. Systematic variations were made in the Reynolds number, the taper angle of the converging and diverging modules, and the module aspect ratio. Flow visualizations were performed using the oil-lampblack technique. A performance analysis comparing periodic tubes and conventional straight tubes was made using the experimentally determined heat transfer coefficients and friction factors as input. For equal mass flow rate and equal transfer surface area, there are large enhancements of the heat transfer coefficient for periodic tubes, with accompanying large pressure drops. For equal pumping power and equal transfer surface area, enhancements in the 30–60 percent range were encountered. These findings indicate that periodic converging-diverging tubes possess favorable enhancement characteristics.

Effect of fan-generated swirl on turbulent heat transfer and fluid flow in a pipe

2016 ◽  
Vol 95 ◽  
pp. 1019-1025 ◽  
Author(s):  
J.M. Gorman ◽  
E.M. Sparrow ◽  
S. Ilamparuthi ◽  
W.J. Minkowycz
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Turbulent Heat Transfer ◽  
Turbulent Heat
Sign in / Sign up

Export Citation Format

Share Document