CFD Analysis of Heat Transfer Enhancement of Shell Side Fluid Flow Over Inline, Non-circular Leading-Edge Wing Shape Tube
Tóm tắt
The objective of the present numerical analysis is to study heat transfer rate and pressure drop characteristic of the fluid flowing over the inline arrangement of novel leading edge (narrow part of the tube cross-section face upstream side) wing-shaped tube bundle which is compared with the inline arrangement of the trailing edge (narrow part of the tube cross-section face downstream side) wing-shaped tube and circular tubes cross sections separately. The study would show how the leading-edge wing-shaped tubes enhance heat transfer rate; thermal energy transfer and reduce pressure drop; a momentum energy transfer across the fluid flowing over the tubes as compared to trailing-edge wing-shape and circular-shape tubes. This study is carried out on a three-dimensional CFD model using finite volume discretization in ANSYS Fluent v16. All tube geometry have equivalent hydraulic diameter and evaluated under the similar hydrodynamic and thermal boundary conditions. The forced air flows over the external surface of the hot tubes and exchanges heat with the tube that passes hot fluid flowing in within. The RNG k–e turbulence model is selected as it yields improved results for those swirling flows and flow separation. The second-order upwind scheme is selected for Energy and Momentum equations. The Semi-Implicit Pressure Linked Energy SIMPLE algorithm is used to couple velocity–pressure. A low convergence criterion is selected for all residuals, to acquire accurate prediction of different thermo-physical parameters. The pitch-to-tube diameter ratio, p/d value is 1.5 and Re ranges from 3500 to 19,000. It is worth noticing that the resultant numerical values indicate enhanced heat transfer rate, enhanced Nusselt number at commensurate lower Euler number with the use of leading-edge wing-shape tube cross-section, in comparison of circular tube and trailing-edge wing-shape tube; presented here by graphs. The comparison of the present study with available previous studies is discussed, which shows a good agreement with published results.
Tài liệu tham khảo
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