Experimental Investigation of the Augmentation of Forced Convection Heat Transfer in a Circular Tube Using Spiral Spring Inserts

1987 ◽  
Vol 109 (2) ◽  
pp. 300-307 ◽  
Author(s):  
J. P. Chiou
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Heat Transfer Coefficient ◽  
Single Phase ◽  
Circular Tube ◽  
Convection Heat Transfer ◽  
Engine Oil ◽  
Convection Heat ◽  
Cooling Mode ◽  
Spiral Spring

Results of the experimental investigation of a class of spiral spring coil used as a tube side heat transfer augmentative device for a single phase cooling mode operation are presented. SAE 10 engine oil flowing inside the tube is cooled by water flowing outside the tube. This spiral spring insert is inexpensive but it can increase the tube side heat transfer coefficient significantly. Thus its use as an augmentative device is effective. Application of this device in the design of oil coolers is discussed.

Experimental Investigation of Heat Transfer in Coiled Annular Ducts

1988 ◽  
Vol 110 (2) ◽  
pp. 329-336 ◽  
Author(s):  
S. Garimella ◽  
D. E. Richards ◽  
R. N. Christensen
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Circular Tube ◽  
Convection Heat Transfer ◽  
Convection Heat ◽  
Transfer Coefficients ◽  
Dean Number ◽  
Average Heat ◽  
Circular Tubes ◽  
Heat Transfer Coefficients

Forced convection heat transfer in coiled annular ducts was investigated experimentally. Average heat transfer coefficients were obtained for both laminar and transition flows. Two coiling diameters and two annulus radius ratios were used in the study. The data were correlated with Dean number and Reynolds number separately and compared with the available studies of coiled circular tubes and straight annular ducts. It was found that coiling augments the heat transfer coefficients above the values for a straight annulus especially in the laminar region. However, the augmentation is less than would be expected for a coiled circular tube. The augmentation decreases as the flow enters the transition region.

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