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ISSN Online: 2377-424X

ISBN Print: 0-89116-130-9

International Heat Transfer Conference 6
August, 7-11, 1978, Toronto, Canada

AN EXPERIMENTAL INVESTIGATION OF THERMAL MIXING IN CROSS-FLOW TUBE BANKS

Get access (open in a dialog) DOI: 10.1615/IHTC6.1670
pages 255-260

Résumé

Experiments have been conducted to determine the thermal mixing characteristics of gas streams flowing through in-line and staggered arrangements of both plain and finned tubes in cross-flow. A thermal spike was generated upstream of the test section by a suitably arranged line heater and the decay of this spike was measured by thermocouples traversing the gas flow at various positions within and downstream of the test bank.
It was found that in the range of Reynolds numbers covered, 1.1 × 104 ≤ Re ≤ 6.6 × 104 the thermal mixing in cross-flow tube configurations falls into three groups:-
(i) 23 ≤ PE ≤ 30 for in-line arrangements of finned tubes with wide transverse pitch
(ii) 14 ≤ PE ≤ 24 for staggered arrangements of plain and finned tubes
(iii) 7 ≤ PE ≤ 14 for in-line arrangements of plain tubes.
The high thermal mixing of tube configurations in group (iii) is associated with the transverse drift of gas which has been observed by both thermal and flow visualization studies. For all three groups the dependence of the turbulent Peclet number on Reynolds number was found to be very weak in the range of variables examined.