NDLI: Study of the heat-transfer crisis on heat-release surfaces of annular channels with swirl and transit flows

Content Provider	Springer Nature Link
Author	Boltenko, E. A.
Copyright Year	2016
Abstract	The results of the experimental study of the heat-transfer crisis on heat-release surfaces of annular channels with swirl and transit flow are presented. The experiments were carried out using electric heated annular channels with one and (or) two heat-release surfaces. For the organization of transit flow on a convex heat-release surface, four longitudinal ribs were installed uniformly at its perimeter. Swirl flow was realized using a capillary wound tightly (without gaps) on the ribs. The ratio between swirl and transit flows in the annular gap was varied by applying longitudinal ribs of different height. The experiments were carried out using a closed-type circulatory system. The experimental data were obtained in a wide range of regime parameters. Both water heated to the temperature less than the saturation temperature and water-steam mixture were fed at the inlet of the channels. For the measurement of the temperature of the heat-release surfaces, chromel-copel thermocouples were used. It was shown that the presence of swirl flow on a convex heatrelease surface led to a significant decrease in critical heat flows (CHF) compared to a smooth surface. To increase CHF, it was proposed to use the interaction of swirl flows of the heat carrier. The second swirl flow was transit flow, i.e., swirl flow with the step equal to infinity. It was shown that CHF values for a channel with swirl and transit flow in all the studied range of regime parameters was higher than CHF values for both a smooth annular channel and a channel with swirl. The empirical ratios describing the dependence of CHF on convex and concave heat-release surfaces of annular channels with swirl and transit flow on the geometrical characteristics of channels and the regime parameters were obtained. The experiments were carried out at the pressure p = 3.0–16.0 MPa and the mass velocity ρw = 250–3000 kg/(m$^{2}$s).
Starting Page	718
Ending Page	723
Page Count	6
File Format	PDF
ISSN	00406015
Journal	Thermal Engineering
Volume Number	63
Issue Number	10
e-ISSN	15556301
Language	English
Publisher	Pleiades Publishing
Publisher Date	2016-09-16
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	heat transfer crisis convex and concave heat-release surfaces annular channel swirl and transit flows Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology Nuclear Energy and Engineering

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