Amosova E., Shishkin A.

ELENA AMOSOVA, Candidate of Physical and Mathematical Sciences, Associate Professor, e-mail: el_amosova@mail.ru
ALEXANDER SHISHKIN, Laboratory Assistant, e-mail: 12abcd21@mail.ru
Department of Mechanics and Mathematical Modeling, School of Engineering
Far Eastern Federal University
8 Sukhanova St., Vladivostok, 690091, Russia

Analysis of the influence of the non-uniform distribution of heat transfer coefficients on the heat exchange efficiency of the annular ribs

Abstract: A single rib in the system of ribs of an extended ribbed surface of a circular structure is under consideration. Fuel elements of a nuclear reactor operate at extremely high temperatures, which adversely affect the strength characteristics of materials. In the ribbed walls and the ribs themselves, temperature gradients arise, the magnitude of which depends on the geometric dimensions, the thermal conductivity coefficient, the material of the rib, and the cooling conditions. The heat transfer coefficient for flow around the pipe varies along the height of the rib. Equations based on average heat transfer coefficient can lead to inaccurate thermal calculations.

In this paper, the authors investigate the process of heat propagation in a ribbed wall with an annular geometry with the uneven nature of heat transfer on the surface of the rib, as well as the influence of the vortex structure of the coolant motion in the gap between the ribs. Thus, it is concluded that the distribution of the temperature field in a single rib is attributable to the two-dimensionality and the substantial non-uniformity of heat exchange on the surface of the rib. Using the software model, the thermal behavior of various configurations of the rib was analyzed under the condition of forced convection that allows fast validation of new structures.

The paper illustrated the distributions of temperature fields in different parts of the fuel element under study. The results are presented in the form of graphs.

Keywords: heat transfer, heat exchange efficiency, ribbed surface.

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