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Heat Transfer Research
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ISSN Druckformat: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v37.i4.20
pages 295-305

Generalization of the Existing Collection of Experimental Information on Critical Heat Loads in Flow Twisting

Yury A. Kuzma-Kichta
Moscow Power Engineering Institute Moscow, Russia
Vasilii V. Glazkov
Moscow Power Engineering Institute (Technical University), Russia

ABSTRAKT

The data of eight works on critical heat loads for heat carrier streams twisted in a tube with the aid of a tape (272 experimental points in all) are presented. A comparison of the data on critical heat loads on stream twisting with corresponding data for smooth tubes at x ≤ 0 is made. The results of the comparison allow the following assumptions to be made: 1) for both smooth tubes and tubes with tape swirlers the action of the same factors is determining in heat transfer crisis; 2) for both smooth tubes and tubes with tape swirlers the dependence of the critical heat load on the length of a heated section seems to be valid; this dependence is very strong, approximately as ∼1/L. This result can be due to the weakening of turbulent fluctuations of the mass velocity in the flow core due to the appearance of a bubble layer near the heater surface.


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