Alexander Mazo, Evgeniy Kalinin, Valery Molochnikov, Dmitry Okhotnikov, Anton Paereliy, Olga Dushina
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Heat transfer enhancement behind an obstacle in a channel flow undergoing transition to turbulence
Direct numerical simulation of heat transfer behind a spanwise obstacle was carried out in a steady channel flow. Reynolds numbers corresponded to transition to turbulence in the separation region behind the obstacle. The obstacle was mounted either on the channel wall or with a gap from the wall. Thorough verification of numerical results (visual flow pattern and flow statistics) against experimental data was carried out. Distributions of local coefficients of heat transfer and skin friction behind the obstacle were found to correlate with vortical structure of the flow. For both positions of the obstacle relative to the channel wall, the study discovered principal regularities in the behavior of local and averaged across the channel values of heat transfer behind the obstacle with the varying Reynolds number of the oncoming flow. The effect of obstacle position on the total increase in heat transfer coefficient on the wall behind the obstacle was estimated in comparison with the smooth wall.
期刊介绍:
Heat Transfer Research (ISSN1064-2285) presents archived theoretical, applied, and experimental papers selected globally. Selected papers from technical conference proceedings and academic laboratory reports are also published. Papers are selected and reviewed by a group of expert associate editors, guided by a distinguished advisory board, and represent the best of current work in the field. Heat Transfer Research is published under an exclusive license to Begell House, Inc., in full compliance with the International Copyright Convention. Subjects covered in Heat Transfer Research encompass the entire field of heat transfer and relevant areas of fluid dynamics, including conduction, convection and radiation, phase change phenomena including boiling and solidification, heat exchanger design and testing, heat transfer in nuclear reactors, mass transfer, geothermal heat recovery, multi-scale heat transfer, heat and mass transfer in alternative energy systems, and thermophysical properties of materials.