Affiliation:
1. St. Petersburg State Marine Technical University
2. St. Petersburg State University of Civil Aviation
3. Peter the Great St. Petersburg Polytechnic University
Abstract
Anomalous heat transfer intensification in turbulent separated air flow over a long groove of moderate depth made in a plate inclined at an angle of 45°to the freestream is revealed both experimentally and numerically. The region under investigation includes a rectangle heated to 100°C by saturated water vapor. The Reynolds number varied from 103to 3×104. Using the gradient heatmetry the twofold increase, as compared with the case of a flat plate, of the heat transfer coefficient on the groove bottom is established at the Reynolds number Re = 3×104. The relative Nusselt number in different regions of the groove is determined both in the physical experiment and in the RANS calculations with the application of multiblock computational technologies and the SST model in the VP2/3 software package. The results are in good agreement in the turbulent flow regime at Re = (5, 10, and 30) ×103.
Publisher
The Russian Academy of Sciences
Reference20 articles.
1. Isaev S., Gritckevich М., Leontiev А., Popov I. Abnormal enhancement of separated turbulent air flow and heat transfer in inclined single-row oval-trench dimples at the narrow channel wall // Acta Astronautica. 2019. Vol. 163 (part. A). P. 202–207.
2. Исаев С.А. Генезис аномальной интенсификации отрывного течения и теплообмена в наклонных канавках на структурированных поверхностях // Изв. РАН. Механика жидкости и газа. 2022. № 5. С. 13–24.
3. Исаев С.А. Аэрогидродинамические механизмы интенсификации физико-энергетических процессов на структурированных энергоэффективных поверхностях с вихревыми генераторами // Теплофизика и аэромеханика. 2023. Т. 30. № 1. С. 83–88.
4. Isaev S.A., Schelchkov A.V., Leontiev A.I., Gortyshov Yu.F., Baranov P.A., Popov I.A. Tornado-like heat transfer enhancement in the narrow plane-parallel channel with the oval-trench dimple of fixed depth and spot area // Int. J. Heat and Mass Transfer. 2017. V. 109. P. 40–62.
5. Исаев С.А., Гувернюк С.В., Никущенко Д.В., Судаков А.Г., Синявин А.А., Дубко Е.Б. Взаимосвязь аномальной интенсификации отрывного течения и экстраординарных перепадов давления в канавке на пластине при изменении угла наклона от 0 до 90° // Письма в ЖТФ. 2023. Т. 49. Вып. 15. С. 39–42.