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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.v43.i5.40
pages 443-460

HEAT TRANSFER IN THE INITIAL PART OF THERMAL STABILIZATION OF HELICAL CHANNELS IN AIR FLOW

Povilas Poskas
Lithuanian Energy Institute, Branduolines inzinerijos problemas laboratorija, Breslaujos str. 3, LT-44403 Kaunas, Lithuania
Vytautas Simonis
Lithuanian Energy Institute, Branduolinës inzinerijos problemø laboratorija, Breslaujos str. 3, LT-44403 Kaunas, Lithuania

ABSTRAKT

Experimental results, their analysis and generalization are presented for local heat transfer from the convex and concave surfaces of rectangular helical channels in the initial part of thermal stabilization in air flow over a wide range of operating (Re =103−4·105) and geometrical (D/h = 5−90, b/h = 2−20) parameters in one-side heating.

It was established, according to the helical channels length, that heat transfer from a convex surface decreases and that from a concave surface increases approaching the stabilized values, which in the channel of the highest curvature (D/h = 5.5) reach up to −50% for a convex surface and up to +60% for a concave surface versus those in a straight flat channel. With a decrease of channel curvature (an increase of the parameter D/h), heat transfer intensity from both surfaces decreases in comparison with a straight flat channel. Also, heat transfer stabilization on a convex surface occurs later than on a concave surface or in a straight flat channel.

Correlations were obtained for changes of heat transfer from convex and concave surfaces of helical channels in the initial part of thermal stabilization, in comparison with stabilized heat transfer.


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