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International Heat Transfer Conference 6

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

SHELL-AND-TUBE HEAT EXCHANGER DATA PRODUCED BY AN ELECTROCHEMICAL MASS TRANSFER MODELLING TECHNIQUE

Robert V. Macbeth
UKAEA, Atomic Energy Establishment, Winfrith, Dorset, England

DOI: 10.1615/IHTC6.1620
pages 225-230

Abstract

Heat transfer data relating to the shell-side of shell-and-tube heat exchangers have been produced using a diffusion controlled electrochemical mass transfer modelling technique. The work has been done at the UK Atomic Energy Establishment, Winfrith and has been sponsored by the Harwell based Heat Transfer and Fluid Flow Consultancy and Testing Service (HTFS).
In the electrochemical technique an aqueous solution of potassium ferri and ferro cyanide is circulated through a heat exchanger model made of plastic, covering a range of Reynolds numbers. Parts of the tube bundle surface are made of nickel and serve as electrodes where local heat transfer is to be determined. A potential applied between these nickel surfaces (cathodes) and a larger anode produces an electric current which is a measure of the mass transfer of ions by diffusion through the boundary layers. Using the Chilton and Colburn analogy between heat and mass transfer local heat transfer coefficients can be calculated directly from the measurements and detailed distribution patterns quickly established. The technique has been validated by comparison of analogue data with the results of actual heat transfer experiments. In the past 6 years nearly 100 different tube bundle arrangements have been tested. Variables examined include type of baffle, baffle spacing, baffle cut, tube layout, tube/baffle and baffle/shell clearances. This paper describes the technique and discusses some of the important conclusions that have emerged from the vast amount of experimental data produced.

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