TED-AJ03-570 A NUMERICAL METHOD FOR ANALYZING A CROSS-FLOW HEAT EXCHANGER ACCOUNTING FOR THE COUPLED EFFECTS OF NONUNIFORM FLOW, LATERAL AND LONGITUDINAL WALL CONDUCTION, AND LAYER STACKING

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概要

• 論文の詳細を見る

• The classical ε-Ntu relations for cross-flow heat exchangers are based on a number of idealized assumptions. For most of the idealizations, the departures from the idealizations, or at least the effects of the departures, are negligibly small in most cross-flow heat exchanger applications. However, the assumptions of uniformly distributed flow on both fluid sides, no longitudinal or lateral conduction in the exchanger walls, and no stacking effects (wall-to-wall temperature gradients via conduction across the fins) are seldom if ever achieved in practice. The performance degradation resulting from these nonideal conditions has been found to range from small but significant to highly detrimental. The individual effects of nonuniform flow. This paper documents the development of a numerical method for analyzing a cross-flow heat exchanger, accounting for nonuniform flow, lateral/longitudinal wall conduction, and layer stacking effects. The method is based on discretizing the heat exchanger into finite volumes or cells and applying the conservation of energy statement directly to each of the cells. The scheme is intuitive and insightful. Moreover, the approach assures that conservation of energy is satisfied for every cell within the domain regardless of cell size (as opposed to discretizing the governing differential equations, which is conservative only in the limit as cell size approaches zero). The resulting algorithm provides a high degree of accuracy with a small number of cells. Comparisons over a wide range of heat exchanger sizes (0.1≤Ntu≤100) indicate that a 10×10 grid yields agreement to within 0.1% of the exact solution for an ideal heat exchanger. The solution procedure is both memory and computationally efficient, generating nearly instantaneous results (as perceived by the user) on a personal computer.

• 一般社団法人日本機械学会の論文

著者

• Taylor Robert

  Department Of Mechanical Engineering Mississippi State University

• James Carl

  Department of Mechanical Engineering, Mississippi State University

• Hodge B.

  Department of Mechanical Engineering, Mississippi State University

• Hodge B.

  Department Of Mechanical Engineering Mississippi State University

• James Carl

  Department Of Mechanical Engineering Mississippi State University

関連論文

• TED-AJ03-570 A NUMERICAL METHOD FOR ANALYZING A CROSS-FLOW HEAT EXCHANGER ACCOUNTING FOR THE COUPLED EFFECTS OF NONUNIFORM FLOW, LATERAL AND LONGITUDINAL WALL CONDUCTION, AND LAYER STACKING
• TED-AJ03-571 A NOVEL APPROACH FOR MODELING THE NONUNIFORM FLOW DISTRIBUTIONS IN TYPICAL CROSS-FLOW HEAT EXCHANGER INSTALLATIONS
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