THERMAL OPTIMIZATION OF INTERNALLY FINNED-TUBE IN NATURAL CONVECTION

2016 ◽  
Author(s):  
Younghwan Joo ◽  
Sung Jin Kim
Keyword(s):  
Natural Convection ◽  
Finned Tube ◽  
Thermal Optimization ◽  
Internally Finned Tube

Thermal Optimization of an Internally Finned Tube Using Analytical Solutions Based on a Porous Medium Approach

2007 ◽  
Vol 129 (10) ◽  
pp. 1408-1416 ◽  
Author(s):  
Kyu Hyung Do ◽  
Jung Yim Min ◽  
Sung Jin Kim
Keyword(s):  
Porous Medium ◽  
Analytical Solutions ◽  
Saturated Porous Medium ◽  
Equation Model ◽  
Finned Tube ◽  
Navier Stokes ◽  
Uniform Heat Flux ◽  
Thermal Optimization ◽  
Internally Finned Tube ◽  
Cylindrical Region

The present work deals with thermal optimization of an internally finned tube having axial straight fins with axially uniform heat flux and peripherally uniform temperature at the wall. The physical domain was divided into two regions: One is the central cylindrical region of the fluid extending to the tips of the fins and the other constituted the remainder of the tube area. The latter region including the fins was modeled as a fluid-saturated porous medium. The Brinkman-extended Darcy equation for fluid flow and two-equation model for heat transfer were used in the porous region, while the classical Navier–Stokes and energy equations were used in the central cylindrical region. The analytical solutions for the velocity and temperature profiles were in close agreement with the corresponding numerical solution as well as with existing theoretical and experimental data. Finally, optimum conditions, where the thermal performance of the internally finned tube is maximized, were determined using the developed analytical solutions.

Thermo-hydraulic performances of internally finned tube with a new type wave fin arrays

2016 ◽  
Vol 98 ◽  
pp. 1174-1188 ◽  
Author(s):  
Hao Peng ◽  
Lin Liu ◽  
Xiang Ling ◽  
Yang Li
Keyword(s):  
Finned Tube ◽  
Type Wave ◽  
Internally Finned Tube ◽  
New Type

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.

Transient Numerical Analysis of Different Finned Tube Designs for Use in Latent Heat Thermal Energy Storage Devices

2015 ◽  
Author(s):  
Anton Beck ◽  
Martin Koller ◽  
Heimo Walter ◽  
Michael Hameter
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Numerical Analysis ◽  
Numerical Investigation ◽  
Sodium Nitrate ◽  
Solidification Process ◽  
Melting Process ◽  
Finned Tube ◽  
Heat Transfer Mechanism ◽  
Melting And Solidification

In this paper the results of a numerical investigation of the melting and solidification process of sodium nitrate, which is used as phase change material, will be presented. For the heat transfer to the sodium nitrate different finned tube designs, namely helical-, transversal- and longitudinal finned tubes, are used. The numerical results of the melting and solidification process for the different design cases will be compared. The numerical analysis of the melting process has shown that apart from the first period of the charging process natural convection is the dominant heat transfer mechanism. The numerical analysis of the melting process has also shown that for a fast melting process heat exchanger tubes should be designed in such a way that an unrestricted natural convection is guaranteed. The numerical investigation for the solidification process has shown that the dominant heat transfer mechanism is heat conduction. The investigation has also shown that the solidification front grows more uniformly from the tube surface to the outer shell compared to the melting front. Therefore no significant differences between the different tube designs are detected concerning the solidification process.

Sign in / Sign up

Export Citation Format

Share Document