Airside Performance of Fin-and-Tube Heat Exchangers Having Nonrepeating Nonsymmetrical Slit Fins under Wet Condition

2019 ◽  
Vol 27 (04) ◽  
pp. 1950033 ◽  
Author(s):  
Nae-Hyun Kim
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Water Film ◽  
Finned Tube ◽  
Heat Transfer Characteristics ◽  
Wet Condition ◽  
Study Heat Transfer ◽  
The Many ◽  
The One ◽  
Thin Water Film

In this study, heat-transfer and friction characteristics of newly developed nonsymmetric slit-finned-tube heat exchangers are experimentally investigated. The newly developed slit fin had more slits in the second row than the first row. As a result, different row effect on [Formula: see text] factor than that of conventional enhanced finned-tube heat exchangers was observed. In other words, two-row configuration yielded larger [Formula: see text] factor than the one-row configuration. Comparison with conventional louver fin or slit fin heat exchangers revealed that the present slit fin heat exchangers show superior heat-transfer characteristics, especially at the second row. The reason was attributed to the many narrow slits that formed at the second row, which maintain thin water film along the slits and smooth the condensate flow.

Flow and Thermal Characteristics Analysis of Plate–Finned Tube and Annular–Finned Tube Heat Exchangers fo In–Line and Staggered Configurations

2020 ◽  
Vol 22 (4) ◽  
pp. 1407-1418
Author(s):  
Shadman Sakib ◽  
Abdullah Al-Faruk
Keyword(s):  
Heat Transfer ◽  
Flow Rate ◽  
Heat Exchangers ◽  
Air Flow ◽  
Thermal Characteristics ◽  
Finned Tube ◽  
Air Flow Rate ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Exit Temperature

AbstractAs the effective selection of fin can greatly enhance the performance of heat exchanger, heat transfer and pressure drop performance on the air-side of annular and rectangular finned tube heat exchangers were numerically investigated. Two types of tube arrangement (in-line and staggered alignment) were examined for 6 different air flow rate for both the heat exchangers using computational fluid dynamics software package ANSYS FLUENT. Renormalization group theory (RNG) based k-ε turbulence model was employed to handle the unsteady three-dimensional flow and the conjugate heat transfer characteristics. The exit temperature were determined from the simulated results and then the LMTD, heat transfer rate and air-side heat transfer coefficient were calculated. The numerical flow visualization results revealed few important aspects, such as, the development boundary layers between the fins, the formation of the horseshoe vortex system, and the local variations of the velocity and temperature on the fin geometries. The result shows that as the air flow rate increased the exit temperature decreased but the overall heat transfer increased. Staggered configuration shows higher heat transfer characteristics over the in-line configuration. The rectangular finned tube shows 17 to 24% improvement in heat transfer over the annular finned tube.

scholarly journals CFD analysis and heat transfer characteristics of finned tube heat exchangers

2019 ◽  
Vol 14 (3) ◽  
pp. 165-176 ◽  
Author(s):  
Máté Petrik ◽  
Gábor Szepesi ◽  
Károly Jármai
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Finned Tube ◽  
Cfd Analysis ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics
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