Thermal analysis of non-newtonian fluid flow over superhydrophobic surface
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Date
2019-05
Authors
Gan, Zheng Hong
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Abstract
The advancement of technology has led to the demand for hydrophobic surface coating and miniature components. However, recent studies only reveal the effects of superhydrophobic surface on Non-Newtonian fluid for circular channel. Hence, there is a need for further the understanding of another type of channel (i.e, plane channel). This study presents a numerical investigation on the hydrodynamic entrance length and thermal entrance length of power-law fluid for planar channel flow consists of alternating superhydrophobic grooves and ribs arranged parallel to the flow direction. The simulations were performed in low Reynolds number range 0.001<Re<100, for power-law index in the range of 0.5<n<1.5 with dimensionless gas area fraction in the range of 0.125< 𝛿 <0.875 for hydrodynamic entrance length. On the other hands, the simulations for thermal entrance length were carried out in low Reynolds number range 0.001<Re<0.007, for power-law index in the range of 0.6<n<1.3 with dimensionless gas area fraction of 0.125< 𝛿<0.875. Numerical results show that the hydrodynamic entrance length for flow over superhydrophobic transverse grooves was longer compared to smooth wall for 0.5<n<n0.9 and shorter for 1.0<n <1.5 Apart from that, it was found that the development length has a positive correlation with dimensionless gas area fraction and Reynolds numbers. On the other hand, results show that the thermal entrance for planar channel flow having alternating ribs and grooves arranged parallel to the flow direction shows a positive correlation with Reynolds number, power-law index and dimensionless gas area fraction.