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.

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Record number 307177
Title Developing mixed convection in a coiled heat exchanger
Author(s) Sillekens, J.J.M.; Rindt, C.C.M.; Steenhoven, A.A. van
Source International Journal of Heat and Mass Transfer 41 (1998)1. - ISSN 0017-9310 - p. 61 - 72.
Department(s) Agrotechnological Research Institute
Publication type Refereed Article in a scientific journal
Publication year 1998
Abstract In this paper the development of mixed convection in a helically coiled heat exchanger for Re = 500, Pr = 5 and
δ =114
is studied. The influence of buoyancy forces ¢
(Gr = ¢O (105))
on heat transfer and secondary flow is analyzed. In the method used the parabolized equations are solved using a finite difference discretization. The code is tested on mixed convection flow in a 90° curved tube of which the results are compared to the results obtained with an elliptical code. For the helically coiled tube a constant wall temperature is considered. It appeared that heat transfer is highly influenced by secondary flow induced by centrifugal and buoyancy forces. For low Grashof numbers a splitting phenomenon of the temperature field is observed due to large secondary velocities, resulting in two separated areas of fluid. For high Grashof numbers the fluid in the coiled pipe becomes almost linearly startified which results in small secondary velocities. A wavy behaviour in the Nusselt number is observed for medium Grashof numbers.
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