CFD Analysis of the Thermal Hydraulic Performance of a Heat Exchanger Tube Utilizing a Combination of Different Inserts
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Abstract
This inserts embedded heat exchanger tube is numerically investigated at a wide range of Reynolds number (Re) i.e. 4000-22000. The study examines the geometrical parameters of inserts, such as pitch, peg form length, and circular shaped inserts diameter. The smooth tube has a length of L = 1500 mm, an inner diameter of Din = 37 mm, and an outer diameter of Dout = 42 mm. This model has been designed with multiple variations in ring diameters (d = 10, 12 and 14 mm) and peg leg lengths (lp = 5, 6 and 7 mm), maintaining a constant arc, resulting in a seamless design of a smooth tube, ultimately referred to as the round peg-shaped HET. The width of the combined shaped inserts is represented as wp = 37 mm, and the hydraulic diameter of the tube is Dh = 0.037 m, with pitch variations of round peg-shaped inserts P = 70, 90, 110 and 130 mm. The study displays the results of all modifications in these parameters. The CFD analysis of the RNG k-ɛ model, shows that heat transfer rate increases with Reynolds number. Nusselt number increases with pitch to hydraulic diameter ratio (P = 70 and 90 mm) and roughness variation. The highest Nusselt number is 209.3 for round peg leg HET. The friction factor is decreased with increasing Nusselt number and the lowest friction factor is achieved at 130 mm and d = 14 mm. These variations are pretended to enhance the thermal performance, and observed 329.53% increment of heat transfer as compared to smooth tube, and found maximum thermal performance of 2.2 at Re = 22000, d = 12 mm, lp = 6 mm) and p = 90 mm.
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This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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