Performance Evaluation of Laminar Fully Developed Flow Through Ducts with Trapezoidal and Hexagonal Ducts Subjected to T Boundary Condition. Part 1


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Abstract


Extended performance evaluation criteria (ExPEC) have been used to assess the performance characteristics of single-phase fully developed laminar flow through bundle with trapezoidal or hexagonal ducts. The bundle with circular tubes has been used as a reference heat transfer unit. The T boundary condition has been selected as thermal boundary condition. The performance characteristics of the bundles with trapezoidal or hexagonal ducts have been evaluated and compared to those of the reference unit for different objectives and constraints imposed. As a common constraint, the cross sectional area of the non-circular duct has been specified, Af* = 1. In Part 1, the main objectives are the increased heat rate, Q* > 1, cases FG-1a (fixed geometry) and VG-2a (variable geometry), and decreased entropy generation, NS < 1. Comparisons with the performance characteristics of the bundles with rectangular and elliptical ducts are also presented. As expected, the analysis of the thermal performance of bundles with non-circular ducts as heat transfer units revealed that the selection of the optimal shape of the ducts strongly depends on the geometric and thermal-hydraulic constraints, and the objectives pursued. The evaluation concerning the superiority of a particular shape of the non-circular duct depends also on the value of irreversibility distribution ratio,
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Keywords


Performance Evaluation Criteria; Single-Phase Laminar Flow; Trapezoidal/ Hexagonal Ducts; Entropy Generation

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References


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