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International Heat Transfer Conference 10

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)


Thaddaeus Bes
Institute for Thermodynamics University of the Federal Armed Forces, Hamburg Holstenhofweg 85 D-22039 Hamburg Germany

Wilfried Roetzel
Institut für Thermodynamik, Universität der Bundeswehr Hamburg, D-22039 Hamburg, Germany

DOI: 10.1615/IHTC10.2030
pages 351-356


A new two-dimensional thermal model is proposed which can be regarded as a more realistic alternative to the cell method of Gaddis & Schlunder [8] developed in 1975.
In the present model the cell is selected in a way other than that in [8]. As a principle each cell consists of only one cross-flow tube row between two neighbouring baffles. The shell-side fluid is now considered to be mixed only infront of the first tube row following the baffle window. Between the subsequent rows the shell-side fluid is unmixed until it is mixed again in the next baffle window. Due to turbulence the tube-side fluid is only mixed across each tube, but not along it and not from tube to tube.
For the analytical calculation of the temperature distribution inside and outside the tubes, a special method was developed earlier by Bes & Roetzel (1983) for the calculation of cross flow arrangements [2]. In this method a weighted mean value of the outside fluid inlet and outlet temperatures to each row is applied in order to simplify radically the mathematical operations (see section 2.) .
For simplicity of treatment the bundle is considered to be rectangular, i.e. the number of tubes in each cross-flow row is constant.

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