A New Estimation Method of Turbulent Flow Structures Effective for Impingement Heat Transfer Augmentation.

2001 ◽  
Vol 34 (9) ◽  
pp. 1136-1140 ◽  
Author(s):  
SHINYA KISHIMOTO ◽  
JIANXING ZHENG ◽  
TAKAYUKI OCHI ◽  
TOKUO YOSHIMURA ◽  
NAOTO OHMURA ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Turbulent Flow ◽  
Estimation Method ◽  
Flow Structures ◽  
Heat Transfer Augmentation ◽  
Impingement Heat Transfer

FORCED CONVECTION BASED HEAT TRANSFER ANALYSIS OF SPHERICAL DIMPLE AND PROTRUSION SURFACE IN TURBULENT FLOW

2017 ◽  
Vol 41 (5) ◽  
pp. 771-786 ◽  
Author(s):  
Ashif Perwez ◽  
Shreyak Shende ◽  
Rakesh Kumar
Keyword(s):  
Heat Transfer ◽  
Turbulent Flow ◽  
Friction Factor ◽  
Vortex Flow ◽  
Rectangular Channel ◽  
Heat Transfer Analysis ◽  
Flow Structures ◽  
Transfer Enhancement ◽  
Heat Transfer Augmentation ◽  
Thermal Boundary Conditions

An experimental and numerical investigation is performed to study the effect of dimple and protrusion geometry on the heat transfer enhancement and the friction factor of surfaces with dimples and protrusions subjected to turbulent flow. The parameters used to compare the spherical dimples and protrusions are Nusselt Number, friction factor, and flow pattern. These parameters are obtained for a Reynolds number of 10500-60900. The spherical dimple results showed the greater heat transfer, which is about 6.97% higher and pressure loss which is 5.07% lower than the spherical protrusion. The realistic heat transfer augmentation capabilities of channels with dimples and protrusions can be studied from the experimental results. The comparison is made with respect to the smooth rectangular channel under the same flow and thermal boundary conditions. The numerical analysis is performed which shows the different vortex flow structures of the spherical dimples and protrusions channel.

scholarly journals Effect of various number conical strip inserted in the tube on heat transfer performance

2018 ◽  
Vol 204 ◽  
pp. 04016 ◽  
Author(s):  
M. Anis Mustaghfirin ◽  
Burniadi Moballa ◽  
Syaifullah Hamim Thohari
Keyword(s):  
Heat Transfer ◽  
Turbulent Flow ◽  
Heat Transfer Process ◽  
Central Angle ◽  
Heat Transfer Augmentation ◽  
Flow And Heat Transfer ◽  
Augmentation Techniques ◽  
Multi Phase Flow ◽  
Multi Phase ◽  
Exchanger Tube

This work, fluid flow and heat transfer in single and multi phase flow chould be enhanced by turbulent flow in heat exchanger tube with one of heat transfer augmentation techniques. Characteristic of globular tube fitted with the multiple conical strips insert were investigated. Most of study are related with this work, they found that an addition by single conical strips insert will make nusselt number increase 5%. Unfortunately, it was also increase pressure drop about 10%. This work improve their work by adding amount of conical strips inserts.The modification that will become 4 variation number of conical (n = 2, 3, 4, and 5) with 4 kind of central angle (α = 20°, 30°, 40°, and 50°), it is shown that the best performance of conical strips insert configuration is 2 peace of strips with 20° central angle. This work successfull improve Performance heat transfer value in tube about 11% compare with A. Fan et al work. Thus achieve a high overall heat trasnfer performence and it is a promising tube insert which would be widely used in heat transfer process turbulent flow.

CFD Modeling of Heat Transfer Augmentation in a Circular Tube Fitted with Right-Left Helical Inserts in Turbulent Flow

2009 ◽  
Vol 5 (1) ◽  
Author(s):  
Palani Sivashanmugam
Keyword(s):  
Heat Transfer ◽  
Turbulent Flow ◽  
Circular Tube ◽  
Industrial Applications ◽  
Cfd Modeling ◽  
Heat Transfer Augmentation ◽  
Twist Ratio ◽  
Plain Tube ◽  
Left Movement ◽  
Transfer Flow

Computational heat transfer flow modeling is one of the great challenges in the classical sciences. As with most problems in engineering, the interest in the heat transfer augmentation is increasing due to its extreme importance in various industrial applications. CFD modeling for the heat transfer augmentation in a circular tube fitted with right-left helical tape inserts in turbulent flow conditions has been explained in this paper using Fluent version 6.2.16. The data obtained by simulation are matching with the literature value for a plain tube with the discrepancy of less than plus or minus 5% for Nusselt number and for the friction factor. Enhanced heat transfer with decreasing twist ratio has been observed. Heat flux is more uniform all along the tube and decreases uniformly towards the center. Right-left movement of the flow as per direction twist was also observed from the velocity contour.

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