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Copyright © 2015
M. S. Thirumalai
Experimental Investigations in a Circular Tube to
Enhance Turbulent Heat Transfer Using Mesh Inserts
R. Sakthivel, M. Arunkumar, B. K. Vikneshkannan, and D. Vijayasarathi
The present work focuses on experimental analysis of turbulent flow heat transfer enhancement in a horizontal circular tube by means of mesh inserts. Air is used as the working fluid. Sixteen types of mesh inserts are used with various screen diameters of 22 mm, 18 mm, 14 mm and 10 mm for varying distance between the screens of 50 mm, 100 mm, 150 mm and 200 mm. The horizontal tube was subjected to constant and uniform heat flux. The Reynolds number varied from 15,000 to 30,000. Initially the experiment was carried out without mesh inserts in the horizontal tube and then experiment is carried out using mesh inserts. Then both the results are compared for validation. An optimized relation is derived for both experimental and theoretical values. The optimized relation is derived on the basis of variation of heat transfer coefficient with diameter of mesh inserts and pitch between the mesh insertions.
Keywords: tube, heat transfer, mesh, turbulent flow, pressure drop, augmentation.
In the recent years, considerable emphasis has been placed on the development of various augmented heat transfer surfaces and devices. This can be seen from the exponential increase in world technical literature published in heat transfer augmentation devices, rowing patents and hundreds of manufacturers offering products ranging from enhanced tubes to entire thermal systems incorporating enhancement technology. Energy and materials saving considerations, space considerations as well as economic incentives have led to the increased efforts aimed at producing more efficient heat exchanger equipment through the augmentation of heat transfer. Among many techniques investigated for augmentation of heat transfer rates inside circular tubes, a wide range of inserts have been utilized, particularly when turbulent flow is considered. The inserts studied included twisted tape inserts, coil wire inserts, brush inserts, mesh inserts, strip inserts etc. The utilization of porous inserts has proved to be very promising in heat transfer augmentation. One of the important porous media characteristics is represented by an extensive contact surface between solid and fluid surfaces. The extensive contact surface enhances the internal heat exchange between the phases and consequently results in an increased thermal diffusivity. Different types of porous materials are extensively studied in forced convection heat transfer due to the wide range of potential engineering applications such as electronic cooling, drying processes, solid matrix heat exchangers, heat pipe, enhanced recovery of petroleum reservoirs etc. However the experimental work carried out in this area is limited.
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B. K. Vikneshkannan
Department of Mechanical Engineering
Theni Kammavar Sangam College of Technology
Theni 625 534