HEAT TRANSFER AND FLOW CHARACTERISTICS OF CRYOGENIC FLUIDS IN A MINIATURE CHANNEL OF DOUBLE HELICAL FINNED TUBE

2018 ◽  
Author(s):  
Cai Jie ◽  
Liang Chen ◽  
Shuangtao Chen ◽  
Yu Hou
Keyword(s):  
Heat Transfer ◽  
Flow Characteristics ◽  
Finned Tube ◽  
Cryogenic Fluids

Effect of fin and tube configuration on heat transfer of an internally finned tube

2015 ◽  
Vol 25 (8) ◽  
pp. 1978-1999 ◽  
Author(s):  
Kailash Mohapatra ◽  
Dipti Prasad Mishra
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Transfer Rate ◽  
Flow Characteristics ◽  
Finned Tube ◽  
Maximum Heat ◽  
Content Type ◽  
Maximum Heat Transfer ◽  
Internally Finned Tube ◽  
Fluid Flow Characteristics

Purpose – The purpose of this paper is to determine the heat transfer and fluid flow characteristics of an internally finned tube for different flow conditions. Design/methodology/approach – Numerical investigation have been performed by solving the conservation equations of mass, momentum, energy with two equation-based k-eps model to determine the wall temperature, outlet temperature and Nusselt number of an internally finned tube. Findings – It has been found from the numerically investigation that there exists an optimum fin height and fin number for maximum heat transfer. It was also found that the heat transfer in T-shaped fin was highest compared to other shape. The saw type fins had a higher heat transfer rate compared to the plane rectangular fins having same surface area and the heat transfer rate was increasing with teeth number. Keeping the surface area constant, the shape of the duct was changed from cylindrical to other shape and it was found that the heat transfer was highest for frustum shape compared to other shape. Practical implications – The present computations could be used to predict the heat transfer and fluid flow characteristics of an internal finned tube specifically used in chemical and power plants. Originality/value – The original contribution of the paper was in the use of the two equation-based k-eps turbulent model to predict the maximum heat transfer through optimum design of fins and duct.

scholarly journals Heat Transfer and Flow Characteristics of Finned Tube over Forward Facing Step

2003 ◽  
Vol 2003 (0) ◽  
pp. 169-170
Author(s):  
Norihiro OKUDA ◽  
Ryosuke MATSUKOTO ◽  
Isao ISHIHARA ◽  
Mamoru OZAWA
Keyword(s):  
Heat Transfer ◽  
Flow Characteristics ◽  
Finned Tube ◽  
Forward Facing Step

scholarly journals 1108 Heat Transfer and Flow Characteristics around a Horizontal Finned Tube Immersed in a Fluidized Bed

2007 ◽  
Vol 2007.82 (0) ◽  
pp. _11-8_
Author(s):  
Yohei TSUJI ◽  
Ryosuke HONDA ◽  
Hisashi UMEKAWA ◽  
Mamoru OZAWA
Keyword(s):  
Heat Transfer ◽  
Fluidized Bed ◽  
Flow Characteristics ◽  
Finned Tube

A Theoretical Model of Film Condensation in a Bundle of Horizontal Low Finned Tubes

1989 ◽  
Vol 111 (2) ◽  
pp. 525-532 ◽  
Author(s):  
H. Honda ◽  
S. Nozu ◽  
Y. Takeda
Keyword(s):  
Heat Transfer ◽  
Theoretical Model ◽  
Flow Characteristics ◽  
Vertical Tube ◽  
Finned Tube ◽  
Film Condensation ◽  
Vertical Column ◽  
Finned Tubes ◽  
Fin Spacing ◽  
The Heat Transfer Coefficient

The previous theoretical model of film condensation on a single horizontal low finned tube is extended to include the effect of condensate inundation. Based on the flow characteristics of condensate on a vertical column of horizontal low finned tubes, two major flow modes, the column mode and the sheet mode, are considered. In the column mode, the surface of the lower tubes is divided into the portion under the condensate column where the condensate flow is affected by the impinging condensate from the upper tubes, and the portion between the condensate columns where the condensate flow is not affected by the impinging condensate. In the sheet mode, the whole tube surface is assumed to be affected by the impinging condensate. Sample calculations for practical conditions show that the effects of the fin spacing and the number of vertical tube rows on the heat transfer performance is significant for R-12, while the effects are small for steam. The predicted value of the heat transfer coefficient for each tube row compares well with available experimental data, including four fluids and five tube bundles.

scholarly journals Influence of Perforated Fin on Flow Characteristics and Thermal Performance in Spiral Finned-Tube Heat Exchanger

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 556 ◽  
Author(s):  
Hyung Lee ◽  
Jaiyoung Ryu ◽  
Seong Lee
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Thermal Performance ◽  
Stokes Equations ◽  
Flow Characteristics ◽  
Finned Tube ◽  
Reference Case ◽  
Ansys Fluent ◽  
Tube Heat Exchanger ◽  
Finned Tube Heat Exchanger

The present study conducts the numerical investigation of flow characteristics and thermal performance of spiral finned-tube heat exchangers. The effects of location of perforations (90°, 120°, and 150°) on heat transfer and pressure drop are analyzed for the air-side. The commercial computational fluid dynamics code ANSYS Fluent (V.17.0) is used for simulations with the RNG k-ε model based on the Reynolds-averaged Navier–Stokes equations. The velocity field, Colburn j-factor, and friction factor are analyzed to evaluate the heat transfer and pressure drop characteristics. Because of the flow through the perforations, the boundary layers on the fin surfaces are interrupted. This results in increased flow disturbances close to the fin, and the heat transfer performance increases compared to the reference case. The pressure drop, which is one of the disadvantages of spiral finned tubes comparing to plate or circular fins, decreases with perforations on the fin. Overall, the cases with perforated fin exhibit greater performance of area goodness factor considering the relationship between the heat transfer and the pressure drop.

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