The effect of surface geometry and the fluid inside the channel wall on thermal-hydraulic performance in sinusoidal corrugated channel in the turbulent fluid flow.

Document Type : Mechanics article


1 Department of Mechanical Engineering, Islamic Azad University, Central Tehran Branch, Tehran, Iran

2 Faculty Member of Islamic Azad University, Central Tehran Branch


This numerical study carried out to find the effects of wall geometry and fluid content of a sinusoidal corrugated channel of turbulent fluid flow on increasing thermal- hydraulic performance factor. The channel consisted of two zones namely, zone1 where the fluid pass through it, and zone2 where the fluid was trapped in the channel walls. . Air and TiO2-water Nano fluid were used as fluid in 1st and 2nd zones. Nano fluid was homogeneous, single-phase, with volumetric concentration of 1%. The upper and lower plates of the channel were heated with a constant heat flux of 616 W/m2. The Reynolds numbers of fluid flow of channel were 3700 to 40,000. The turbulent fluid flow in the 1st zone was simulated using the standard k-ε model. The effects of fluid type used inside the channel wall and wave angle and wave height were investigated. The results showed that when the TiO2-water nanofluid was in the 2nd zone and air passed through 1st zone, the channel performance was the best. The optimum wave angle is 35 degrees and produced the most thermal-hydraulic performance factor in 12000 to 40000 Reynolds numbers. With increasing wave height from 4 to 6 mm, the thermal-hydraulic performance coefficient increases from 65 to 110%. The effect of wave height on the increase of the thermal-hydraulic performance coefficient was more significant than the wave angle change.


Main Subjects

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