Heat Transfer in Annular Channels with the Inner Rotating Cylinder and the Radial Array of Cylinders

Aidar Hayrullin (), Alex Sinyavin, Aigul Haibullina, Margarita Khusnutdinova, Veronika Bronskaya, Dmitry Bashkirov, Ilnur Gilmutdinov and Tatyana Ignashina
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Aidar Hayrullin: Energy Supply of Enterprises, Construction of Buildings and Structures, Kazan State Power Engineering University, 51 Krasnoselskaya Street, 420066 Kazan, Russia
Alex Sinyavin: Energy Supply of Enterprises, Construction of Buildings and Structures, Kazan State Power Engineering University, 51 Krasnoselskaya Street, 420066 Kazan, Russia
Aigul Haibullina: Energy Supply of Enterprises, Construction of Buildings and Structures, Kazan State Power Engineering University, 51 Krasnoselskaya Street, 420066 Kazan, Russia
Margarita Khusnutdinova: Energy Supply of Enterprises, Construction of Buildings and Structures, Kazan State Power Engineering University, 51 Krasnoselskaya Street, 420066 Kazan, Russia
Veronika Bronskaya: Institute of Mechanical Engineering for Chemical and Petrochemical Industry, Kazan National Research Technological University, 68 Karl Marx Street, 420015 Kazan, Russia
Dmitry Bashkirov: Institute of Mechanical Engineering for Chemical and Petrochemical Industry, Kazan National Research Technological University, 68 Karl Marx Street, 420015 Kazan, Russia
Ilnur Gilmutdinov: Institute of Mechanical Engineering for Chemical and Petrochemical Industry, Kazan National Research Technological University, 68 Karl Marx Street, 420015 Kazan, Russia
Tatyana Ignashina: Institute of Mechanical Engineering for Chemical and Petrochemical Industry, Kazan National Research Technological University, 68 Karl Marx Street, 420015 Kazan, Russia

Energies, 2024, vol. 17, issue 23, 1-25

Abstract: Numerical investigations of heat transfer for forced, mixed, and natural convection conditions within an annular channel are carried out. The main objective was to investigate, for the first time, the effect of the radial cylinder array on heat transfer in the annular channel with the rotating cylinder. The governing equations for velocity and temperature with the Boussinesq approximation were solved using the finite-volume method. The heat transfer quantities were obtained for different Rayleigh numbers (10 4 –10 6 ), the radius ratios (1.4–2.6), the radial cylinder spacing, and for different rotating velocities in the form of the Richardson number (10 −2 –10 4 ). The Prandtl number was 0.7. It has been shown that radial cylinders do not influence significantly the intensity and the local distribution of heat transfer on the inner rotating cylinder. The Nusselt number was 1.4–2.0 times higher on the radial cylinder array for all convection modes relative to the outer flat surface. For all annuli gaps with radial cylinders, the maximal values of the Nusselt number were observed with an increase of the radial spacing of cylinders.

Keywords: annular channel; rotating cylinder; radial cylinder array arrangement; natural and mixed convection (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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