Kinematic structure of flows and the heat transfer in flat diffuser and confuser channels
R.R. Shakirov, I.A. Davletshin, N.I. Mikheev
Institute of Power Engineering and Advanced Technologies FRC “Kazan Scientific Center of RAS”, Kazan,Russia
Keywords: gradient flows, diffuser, confuser, flow structure, heat transfer
Abstract
Results of an experimental study of the kinematic structure of flow and the transfer of heat in gradient flows are reported. A field measurement method (SIV) was used to obtain profiles of velocities and turbulence characteristics in characteristic sections of diffuser and confuser channels. Based on the results of thermal measurements, the distributions of the heat-transfer coefficient on the wall of a flat diffuser/confuser were obtained in a wide range of regime parameters. The mechanisms of the formation of the transfer of heat in gradient flows are analyzed. It is shown that, in a diffuser channel, the transfer of heat on the wall as a whole depends on the flow parameters at the diffuser inlet. For a confuser channel, this relation can be determined using the local values of longitudinal flow velocity.
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