Numerical calculation of the effect of deposit formation on heat-exchanger efficiency

被引：25

作者：

Bouris, D

Bergeles, G

机构：

[1] Aerodynamics Laboratory, Department of Mechanical Engineering, Natl. Technical University of Athens, 15700 Zografou, Athens

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 1997年 / 40卷 / 17期

关键词：

D O I：

10.1016/S0017-9310(97)00058-6

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A numerically calculated deposit was used to identify the shape of a fouled tube and an orthogonal curvilinear grid was constructed in and around the deposit. The flow and temperature field was calculated and an implicit boundary condition, accounting for the effects of turbulence, was introduced at the solid-fluid interface for the simultaneous calculation of the temperature held in the fluid and the solid. Validation is presented against experimental and numerical calculations. Finally, a reduction of 8-17% in the heat transfer rate was found to occur for a deposit corresponding to 8 h of operation in a staggered tube bundle heat-exchanger of a lignite utility boiler. Thermal resistance of the deposit was also calculated. (C) 1997 Elsevier Science Ltd.

引用

页码：4073 / 4084

页数：12

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