Numerical Simulation of Laminar Flow and Heat Transfer Characteristics in a Tube with Helical Tape Inserts
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Abstract
The laminar flow and heat transfer enhancement characteristics in a tube fitted with helical tape swirl generators, have been numerically studied in the present work. The computations were based on the finite volume method and the SIMPLE algorithm. The helical tape swirl generators with different numbers of helical tape (n = 1, 2, 3 and 4) were examined. The width ratio (w/D) and pitch ratio (p/D) were kept constant at 1.0 and 2.0, respectively. The study was carried out for Reynolds numbers ranging between 100 and 2000, under a uniform wall temperature condition. The numerical result showed that a helical tape generated a swirl flow that conveyed fluid from core region to near tube wall zone and vice versa. The action helped to reduce a thickness of thermal boundary layer and facilitate heat transfer through the tube wall. As the helical tape number (n) increased, it was found that heat transfer rate decreased while friction factor increased. Among the investigated conditions, the highest thermal enhancement factor of 1.71 was achieved by the use of the helical tape with n = 1, at Re = 2000.
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Copyright @2021 Engineering Transactions
Faculty of Engineering and Technology
Mahanakorn University of Technology
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