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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Heat Transfer Research
Импакт фактор: 0.404 5-летний Импакт фактор: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Печать: 1064-2285
ISSN Онлайн: 2162-6561

Выпуски:
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v31.i6-8.50
pages 407-413

Study of the Coefficient of Heat Transfer in a Tube Gas Flow with Unsteady Flow

V. M. Kraev
Moscow State Aviation Institute (Technical University), Moscow, Russia

Краткое описание

Study of heat transfer in unsteady turbulent flows is stipulated by the necessity to improve power systems and plants in the elements of which nonstationary nonisothermal flows are realized.
As is found in earner studies [1,2], nonstationary conditions substantially affect convective heat transfer. A study of a physical picture of turbulence, construction of a mathematical model for its description and development of correct engineering techniques for calculating hydrodynamic processes and heat transfer under the conditions of hydrodynamic nonstationarity are urgent.
The earlier conducted experimental studies of the structure of turbulent gas flows [3] showed a strong difference between the profiles of an axial velocity, axial and radial fluctuations and correlations of them in deceleration and acceleration of the flow on their quasistationary values. The authors of [3] confirmed the results of [2] indicating that flow acceleration increases, whereas deceleration decreases the coefficient of heat transfer.


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