Study on the heat transfer characteristics of the annular fin under dry-surface, partially wet-surface, and fully wet-surface conditions

2006 ◽  
Vol 33 (1) ◽  
pp. 112-121 ◽  
Author(s):  
Paisarn Naphon
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Characteristics ◽  
Surface Conditions ◽  
Transfer Characteristics ◽  
Annular Fin ◽  
Wet Surface

Heat Transfer and Pressure Drop Characteristics of Plain Fin-and-Tube Heat Exchangers Having 5.0 mm Tubes Under Dehumidifying Condition

2015 ◽  
Vol 23 (02) ◽  
pp. 1550016 ◽  
Author(s):  
Nae-Hyun Kim
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Surface Pressure ◽  
Heat Exchangers ◽  
Negligible Effect ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Wet Surface ◽  
Tube Expansion ◽  
Expansion Tubes

In this study, wet surface pressure drop and heat transfer characteristics of plain finned heat exchangers having 5.0 mm diameter (5.3 mm after tube expansion) tubes were investigated. Nine samples having different fin pitches (1.1 to 1.3 mm) and tube rows (1 to 3 rows) were tested. The fin pitch had a negligible effect on j and f factors. Both j and f factors decreased as the number of tube row increased. When compared the j and f factors of the samples having 5.3 mm diameter tubes with those of 7.3 mm diameter tubes, 5.3 mm samples yielded higher j factors and lower f factors. The j/f ratios of 5.3 mm samples are larger than those of 7.3 mm samples which implies that 5.3 mm geometry is more beneficial than 7.3 mm geometry.

Sign in / Sign up

Export Citation Format

Share Document