Airside performance of oval tube heat exchangers having sine wave fins under wet condition

2014 ◽  
Vol 66 (1-2) ◽  
pp. 580-589 ◽  
Author(s):  
Nae-Hyun Kim ◽  
Kang-Jong Lee ◽  
Yeong-Bin Jeong
Keyword(s):  
Heat Exchangers ◽  
Sine Wave ◽  
Wet Condition ◽  
Oval Tube

THERMAL PERFORMANCE OF SINE WAVE FIN-AND-OVAL TUBE HEAT EXCHANGERS

2013 ◽  
Vol 21 (01) ◽  
pp. 1350008 ◽  
Author(s):  
NAE-HYUN KIM ◽  
KANG-JONG LEE ◽  
JI-CHAO HAN ◽  
BYUNG-NAM CHOI
Keyword(s):  
Heat Transfer ◽  
Aspect Ratio ◽  
Thermal Performance ◽  
Heat Exchangers ◽  
Sine Wave ◽  
Heat Transfer Characteristics ◽  
Round Tube ◽  
Flow And Heat Transfer ◽  
Wave Channel ◽  
Oval Tube

Experiments were conducted on sine wave fin-and-tube heat exchangers having oval tubes of 0.6 aspect ratio. Twelve samples having different fin pitches and tube rows were tested. Eight herringbone wave fin-and-tube heat exchangers having round tubes were also tested. For round tube samples, the effect of tube row on j factor is not prominent. For oval tube samples, however, the highest j factor is observed for two row configuration, whereas the lowest one is observed for one row configuration. Possible reasoning is provided considering the flow and heat transfer characteristics of sine wave channel combined with connecting oval tubes. The friction factor decreases as number of tube row increases. Comparison with round tube samples reveals that airside performance of oval fin-and-tube heat exchangers is generally superior except for one-row configuration.

scholarly journals Air-Side Performance of Fin-and-Tube Heat Exchangers Having Sine Wave Fins and Oval Tubes

2013 ◽  
Vol 25 (5) ◽  
pp. 279-288 ◽  
Author(s):  
Byung-Nam Choi ◽  
Fung Yi ◽  
Hyun-Min Sim ◽  
Nae-Hyun Kim
Keyword(s):  
Heat Exchangers ◽  
Sine Wave

Numerical Prediction of Enhanced Heat Transfer Using Oval Tubes and Delta Winglets

2002 ◽  
Author(s):  
D. Maurya ◽  
S. Tiwari ◽  
G. Biswas ◽  
V. Eswaran ◽  
A. K. Saha
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Power Plants ◽  
Transport Coefficients ◽  
Three Dimensional ◽  
Cross Flow ◽  
Vortex Generators ◽  
Delta Winglet ◽  
Fin Tube ◽  
Oval Tube

Unsteady three-dimensional laminar flow and heat transfer in a channel with a built-in oval tube and delta winglets have been obtained through the solution of the complete Navier-Stokes and energy equations using a body-fitted grid and a finite-volume method. The geometrical configuration represents an element of a gas-liquid fin-tube cross flow heat exchanger. The air-cooled condensers of the geothermal power plants also use fin-tube heat exchangers. The size of such heat exchangers can be reduced through enhancement in transport coefficients on the air (gas) side, which are usually small compared to the liquid side. In a suggested strategy, oval tubes are used in place of circular tubes, and delta winglet type vortex generators in common-flow-down configuration are mounted on the fin-surface in front of the tubes, while another delta winglet pair in common-flow-up configuration is mounted downstream of the first set of winglets. An evaluation of this augmentation strategy is attempted in this investigation. The investigation was carried out for a winglet angle of attack of 40 degrees to the incoming flow. The structures of the velocity field, and the heat transfer characteristics have been presented. The results indicate that vortex generators in conjunction with the oval tube show definite promise for the improvement of fin-tube heat exchangers.

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