Thermal optimization of internally finned tube with variable fin thickness

2016 ◽  
Vol 102 ◽  
pp. 1250-1261 ◽  
Author(s):  
Dong-Kwon Kim
Keyword(s):  
Finned Tube ◽  
Thermal Optimization ◽  
Internally Finned Tube ◽  
Fin Thickness

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.

The 3-D Numerical Simulation of Heat Transfer Process of Finned Copper Tube

2011 ◽  
Vol 393-395 ◽  
pp. 412-415
Author(s):  
Jian Hua Zhong ◽  
Li Ming Jiang ◽  
Kai Feng
Keyword(s):  
Heat Transfer ◽  
Transfer Process ◽  
Theoretical Calculations ◽  
Structural Parameters ◽  
Convection Heat Transfer ◽  
Heat Transfer Process ◽  
Finned Tube ◽  
Copper Tube ◽  
Central Air Conditioning ◽  
Fin Thickness

In this article, finned copper tube used in the central air conditioning was acted as the discussed object. According to the combination with actual processing and theoretical calculations, Five finned tube was selected with typical structural parameters, and established their entity model using Pro/E, then the heat transfer process of finned tube was simulated through the ANSYS, the effect of the fin height, fin thickness and other structure parameters to the heat transfer enhancement of finned tube was researched. Meantime the efficiency of the heat transfer under different convection heat transfer coefficient was also studied.

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.

scholarly journals Numerical Analysis of Mixed Convection through an Internally Finned Tube

2012 ◽  
Vol 4 ◽  
pp. 918342 ◽  
Author(s):  
Sachindra Kumar Rout ◽  
Dipti Prasad Mishra ◽  
Dhirendra Nath Thatoi ◽  
Asit Ku. Acharya
Keyword(s):  
Numerical Analysis ◽  
Mixed Convection ◽  
Finned Tube ◽  
Internally Finned Tube

scholarly journals Performance Investigation of The Bed Adsorption of An Adsorption Desalination Using CFD Simulation

2021 ◽  
Author(s):  
Mohamad Hossein Bakhshandeh ◽  
Taleb Zarei ◽  
Jamshid Khorshidi
Keyword(s):  
Silica Gel ◽  
Water Uptake ◽  
Cfd Simulation ◽  
Finned Tube ◽  
Copper Plate ◽  
Cfd Modeling ◽  
Desorption Process ◽  
Critical Elements ◽  
Computational Fluid Dynamics Cfd ◽  
Fin Thickness

Abstract One of the critical elements of an adsorption desalination system is the adsorption bed. System dynamics of a 2-bed single-stage silica gel plus water-based AD system was analyzed. A great pattern is expanded using energy conservation and mass connected with the kinetics of the ad- sorption/desorption process. Computational fluid dynamics (CFD) modeling was handled for simulation of the adsorption process for a rectangular finned tube-based adsorption bed featured with silica gel adsorbent substance. For the simulation, the adsorbents were considered as a solid volume with defined porosity based on Darcy equation. The adsorption and desorption mode of the adsorption bed was simulated. The CFD techniques were then applied to study fin thickness and fin height. The results showed that decreasing the fin thickness increased the water uptake by up to 8% and decreased the fin height from 30mm to 20mm, which resulted in an increase of the water uptake up to 17%. The CFD technique was also used to investigate the effect of plate type on the adsorption bed performance. The results showed that the copper plate improved the water uptake up to 9%. The copper plate decreased the temperature of the adsorption bed up to 11% more than the aluminum plate.

Numerical Investigation of the Thermal Performance of an Axially Rotating Internally Finned Receiver Tube of Parabolic Trough Concentrator

2021 ◽  
Vol 16 ◽  
pp. 241-253
Author(s):  
Andrew S. Tanious ◽  
Ahmed A. Abdel-Rehim
Keyword(s):  
Thermal Performance ◽  
Rotation Rate ◽  
Pressure Coefficient ◽  
Axial Rotation ◽  
Finned Tube ◽  
Outlet Temperature ◽  
Parabolic Trough ◽  
Ansys Fluent ◽  
Fluid Layers ◽  
Internally Finned Tube

Enhancement of the thermal performance of the parabolic trough receiver tube is one of the approaches to energy sustainability. In the present work, the thermal performance of an axially rotating receiver tube equipped with internal flat longitudinal fins is studied. The effects of both the fin height and the rate of axial rotation are investigated at low values of axial Reynold’s number. The numerical analysis is held at various rotation rates using ANSYS Fluent. The numerical findings showed that the effect of the axial rotation on the internally finned receiver tube is not significant yet negative where a maximum reduction of 6% in the outlet temperature is reached in the 2mm height internally finned tube at rotation rate of N=21. However, the analysis showed that as the rotation rate increases, the temperature homogeneity between the fluid layers also increases and thus the liquid stratification phenomenon between the fluid layers is eliminated. The percentage of temperature difference between the fluid layers near the pipe center and the layers near the pipe wall reaches an optimum value of 58.4% at N=21 which is confirmed by an optimum increase of 110% in Nusselt number at the same rotation rate. However, a maximum loss of 81.6% in pressure coefficient is found in the case of the 2mm internally finned tube due to the increased turbulence. Thus, the integration of pipe axial rotation and internal fins can yield an enhancement in the heat transfer to the parabolic trough concentrator receiver tube and thus its thermal performance.

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