Numerical Analysis on the Heat Transfer Characteristics of HDPE Pipe with the Variation of Geometries for Ground Loop Heat Exchangers

Ventilated brake discs are used in high speed vehicles. The brake disc is an important component in the braking system which is expected to withstand and dissipate the heat generated during the braking event. In the present work, an attempt is made to study the effect of vane-shape on the flow-field and heat transfer characteristics for different configurations of vanes and at different speeds numerically. Three types of rotor configurations circular pillared, modified taper radial and diamond pillar vanes were considered for the numerical analysis. A rotor segment of 20? was considered for the numerical analysis due to its rotational symmetry. The pre processing is carried out with the help of ICEM-CFD and analysis is carried out using ANSYS CFX 12.1. The three dimensional flow through the brake rotor vanes has been simulated by solving the appropriate governing equations viz. conservation of mass, momentum and energy using the commercial CFD tool, ANSYS CFX 12. The predicted results have been validated with the results available in the literature. Circular pillar rotor vanes are found to have more uniform pressure and velocity distribution which results in more uniform temperature drop around the vanes. The effect of number and diameter of vanes in the circular pillared rotor is studied and the geometry is optimized for better mass flow and heat dissipation characteristics.

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Pressure Drop and Heat Transfer Characteristics of Louvered Fin Heat Exchangers

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.465-466.500 ◽

2013 ◽

Vol 465-466 ◽

pp. 500-504 ◽

Cited By ~ 1

Author(s):

Shahrin Hisham Amirnordin ◽

Hissein Didane Djamal ◽

Mohd Norani Mansor ◽

Amir Khalid ◽

Md Seri Suzairin ◽

...

Keyword(s):

Heat Transfer ◽

Pressure Drop ◽

Heat Transfer Rate ◽

Heat Exchangers ◽

Transfer Rate ◽

Three Dimensional ◽

Considerable Effect ◽

Heat Transfer Characteristics ◽

Transfer Characteristics ◽

Louvered Fin

This paper presents the effect of the changes in fin geometry on pressure drop and heat transfer characteristics of louvered fin heat exchanger numerically. Three dimensional simulation using ANSYS Fluent have been conducted for six different configurations at Reynolds number ranging from 200 to 1000 based on louver pitch. The performance of this system has been evaluated by calculating pressure drop and heat transfer coefficient. The result shows that, the fin pitch and the louver pitch have a very considerable effect on pressure drop as well as heat transfer rate. It is observed that increasing the fin pitch will relatively result in an increase in heat transfer rate but at the same time, the pressure drop will decrease. On the other hand, low pressure drop and low heat transfer rate will be obtained when the louver pitch is increased. Final result shows a good agreement between experimental and numerical results of the louvered fin which is about 12%. This indicates the capability of louvered fin in enhancing the performance of heat exchangers.

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