INFLUENCE OF THE PRANDTL NUMBER ON HEAT TRANSFER INTENSIFICATION IN A DEVELOPED TURBULENT FLOW IN A CHANNEL WITH ONE FINNED WALL

The paper presents the results of numerical modeling of a developed, spatially periodic turbulent fl ow and heat exchange in a rectangular channel (W/H = 1.5), on a wall of which of width W square cross-section fi ns with a side e = 0.1H are located with a pitch P = H, inclined relative to the channel axis by 45^o. The fl ows of incompressible media are considered at Prandtl numbers equal to 0.01, 0.7 and 10, and Reynolds numbers in the range 104 –106 . The mathematical model of the fl ow is based on the RANS method and the equations of k–ω SST turbulence model. An analysis of heat emission intensifi cation and of increase in the hydraulic resistance compared to fl ow in a smooth channel is performed. Dimensionless dependences for integral characteristics of heat emission are obtained.
The paper presents the results of numerical modeling of a developed, spatially periodic turbulent fl ow and heat exchange in a rectangular channel (W/H = 1.5), on a wall of which of width W square cross-section fi ns with a side e = 0.1H are located with a pitch P = H, inclined relative to the channel axis by 45^o. The fl ows of incompressible media are considered at Prandtl numbers equal to 0.01, 0.7 and 10, and Reynolds numbers in the range 104 –106 . The mathematical model of the fl ow is based on the RANS method and the equations of k–ω SST turbulence model. An analysis of heat emission intensifi cation and of increase in the hydraulic resistance compared to fl ow in a smooth channel is performed. Dimensionless dependences for integral characteristics of heat emission are obtained.
Author:  A. M. Levchenya, S. A. Galaev, V. V. Ris
Keywords:  fi nned channel, turbulent mode, spatially periodic fl ow, developed heat exchange, Prandtl number, numerical modeling
Page:  230