Numerical Study on Thermo-Hydraulic Performance of an Offset-Bubble Primary Surface Channels

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In this paper, the thermo-hydraulic performance of an offset-bubble primary surface channel is presented. The idea of the present design comes from the cross corrugated (CC) primary surface channel and offset-strip plate-fin channel, which imports the transverse disturbance of plate-fin channel into the primary surface channel. The analysis is accomplished by the finite control volume method and the low Reynolds kw turbulent model is used. Under the similar geometrical parameters, the comprehensive performance of the offset-bubble primary surface channel is the best, whose averaged area goodness factor is enhanced by 41% and 71% compared to the CC3.1-60 (pitch-over-height ratio of 3.1 and inclined angle of 60°) and offset-strip plate-fin channels. The comprehensive performance of the offset-bubble primary surface channel with the baseline dimension is superior to the CC4-45 (pitch-over-height ratio of 4 and inclined angle of 45°) and CC3.1-60 primary surface channels. The geometrical parameter studies indicate that variation of the comprehensive performance is very small when the wave length is greater than 18 mm and the effect of wave height is very small.


Bubbles – Dynamics; Cross corrugated; Heat – Transmission; Heat exchangers; Heat recovery; Heat transfer; Offset-bubble; Pressure drop; Primary surface heat exchanger; Surfaces – Thermal properties; Waste heat


Energy Systems | Heat Transfer, Combustion | Mechanical Engineering


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