Effect of wall wettability coupled nanostructure on fluid molecular ordering near wall and flow heat transfer in asymmetric nanochannels

SY Qin and ZX Chen and WG Li and A Ma and LY Xie, INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, 159, 108070 (2024).

DOI: 10.1016/j.icheatmasstransfer.2024.108070

The effect of wall wettability coupled nanostructure on molecular ordering and flow heat transfer of fluid in asymmetric nanochannels was investigated by using the molecular dynamics method. The coupling was changed by three wettability and four nanostructure periods of the down- wall. The results show that the regular ordering of fluid molecules near down-wall is enhanced with an increase in down-wall wettability and nanostructure periods, which is attributed to an increase in the fluid density, number of hydrogen bonds and interaction energy between wall and fluid. Regular ordering of water molecules near down-wall makes the flow velocity and distribution asymmetrical between up-wall and down- wall. Flow resistance increases more with the wall nanostructure periods, but it increases slightly with wall wettability, while the fluid-wall heat transfer increases slightly with the wall nanostructure periods, but it increases more with wall wettability. Assessment of the effect of wall wettability coupled nanostructure on comprehensive heat transfer capacity is given, that case 3 in smooth channel has optimal flow heat transfer performance. Case 6 has the best comprehensive heat transfer performance among the nanochannels with nanostructure wall (case 4 to 12). This research provides theoretical guidance for the wall selection of efficient cooling of micron/nano-electronic devices.

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