Enhancement of natural and forced convection heat transfer has been the subject of numerous academic and industrial studies. Stationary inserts can be efficiently employed as enhancement devices for heat transfer and temperature blending in the heat convection systems. Generally, a stationary heat transfer enhancement insert consists of a number of equal (or similar) motionless segments, placed inside of a pipe in order to control flowing fluid streams. An ideal insert, for temperature blending in compressible flow applications, provides a smaller standard deviation of temperature with minimized pressure drop and required space. The ratio of temperature uniformity to the pressure drop can be used to determine the efficiency of an insert design. It is possible to use different segment lengths for a given insert design to maximize this ratio. Numerical simulation for heat transfer in turbulent flow is employed to simulate the flow and thermal fields for streams of cold and hot gases flowing across stationary inserts with variable segment length and to study the impact of the segment length on the performance of the insert. It is shown that the insert with variable segment length is more effective in temperature blending for two compressible streams.

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