Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

Record number 346658
Title A computational fluid dynamics model for designing heat exchangers based on natural convection
Author(s) Dirkse, M.H.; Loon, W.K.P. van; Walle, T. van der; Speetjens, S.L.; Bot, G.P.A.
Source Biosystems Engineering 94 (2006)3. - ISSN 1537-5110 - p. 443 - 452.
Department(s) Systems and Control Group
AFSG Staff Departments (FBR)
Publication type Refereed Article in a scientific journal
Publication year 2006
Keyword(s) finite-volume method - greenhouses
Abstract A computational fluid dynamics model was created for the design of a natural convection shell-and-tube heat exchanger with baffles. The flow regime proved to be turbulent and this was modelled using the k¿¿ turbulence model. The features of the complex geometry were simplified considerably resulting in an almost two-dimensional mesh with only 30 000 mesh cells. The effect of black-body radiation was investigated. The modelling results were validated experimentally and a model neglecting the effect of radiation turned out to be sufficiently accurate, reducing calculation times with a factor 60. Different meshes were used to check that the solution did not depend on the mesh chosen. The measurements indicated that the cross-flow caused by the baffles improved the heat-flux dramatically. The heat exchanger in this case study was intended to be used in an experimental greenhouse. The usefulness of the heat exchanger model was demonstrated by applying it to relevant variations of the experimental arrangements. The model calculations resulted in many recommendations on the dimensions and the operation of the heat exchanger.
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