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CONTROL IN SCALE OF GENERATED VORTEXES AT AN INPUT IN NOT ROUND INTERRUPTED DUCTS WITH THE PURPOSE OF REALIZATION OF A RATIONAL ENHANCEMENT OF CONVECTIVE HEAT EXCHANGER

DOI: 10.1615/ICHMT.2014.IntSympConvHeatMassTransf.1080
pages 1437-1450

Victor Vasilyev
Astrakhan State Technical University, 414056, Russia

Svetlana Vinokurova
Astrakhan State Technical University, Russia

Svetlana Kotova
Astrakhan State Technical University, 414056, Russia

Résumé

Experimental unit from rather limited number of plate-and-fin interrupted heat transfer surfaces (PFTint HTS) with the wall thickness (of fins) δ = idem = 0.6·10−3 m of rectangular ducts and dissection value − (l/d)m = 1.30, slit − (h/u)m = 6.95 and a relative thickness of a fin 0.0580 ≤ (δ/d)i ≤ 0.1138 was tested in order to determine the influence of δ/d value on heat and aerodynamic performance of PFTint HTS. The assessment values (R')MAXRe'i=x =4400 = [(Nu / Nusm)']MAXRe'i=x=4400 = 2.78 of a rational enhancement process of convective heat transfer (RECH) were obtained, conditions of its realization being the following: Re'i = (0.6...1.4...4.4)·103; (δ/d)'i = 0.071...0.086...0.061. The range of assessment values of realizable processes RECH are the following: sm Rei idem (Nu / Nusm )'Re'i=idem = 2.11...2.28 in the interval of values (δ/d)'i = 0.071...0.086 and criteria Re'i = (0.6...1.4)·103; (Nu / Nusm )'Re'i=idem = 2.28...2.78 in the interval of values (δ/d)'i = 0.086...0.061 and criteria Re'i = (1.4...4.4)·103. The results of this experimental investigation were treated analytically from the point of view of suggested physical mechanism of RECH process realization in the tested PFTint HTS ducts in the conditions of laminar, converting and turbulent flows. Special-purpose preparations for the experiment made it possible to exclude the negative impact of a number of side factors on the results of the experiment.

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