Bharath S. Kattemalalawadi interfacial Science and Surface Engineering Lab (iSSELab) Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada May, 2016

 Microchannels are integral part of microfluidics devices. Used to transport fluids.  Need to efficiently design the channel to reduce the pumping power there by reduces the net energy consumption of the device.  Cost of the micro-devices are very sensitive to energy consumption. Need to minimize it!! Microchannel Pressure loss due to friction in closed channels Pressure drop, f D  Darcy Friction Factor (function of wall shear stress) Viscous drag

Rows Columns Lotus leaf – “Lotus effect”Microscopic view of the leaf Artificial Textures Interaction of liquid with textures Nature!!

 As the spacing between the micro texture increases, the pressure drop decreases  Maximum pressure drop reduction of ~47% is achieved for spacing factor of Φ =0.8 This technique has a considerable impact on energy consumption when implemented in Microchannel !!