Design of a Capillary-Driven Microfluidic Cooling System Using Non-Uniform Cross Section Microchannel

In the present work, a novel configuration is proposed to improve the cooling performance of a capillary-driven system.  In this approach, the possibility of meniscus formation inside the is increased for a wide range of operating temperature by controlling the capillary and viscous forces. The proposed consists of three sections. The first section is a narrow part of to control the pressure drop. The second section of is an evaporator. The meniscus is formed in this section due to of the capillary and viscous forces. It can move along the   The third section is a wide part of The meniscus cannot move further in this section due to decreasing the capillary pressure. The evaporation rate from meniscus is estimated by using the thin film evaporation theory. Results show that the heat flux up to 30-100 W/cm2 70-100⁰C) can be dissipated by the evaporation mechanism from a hydrophilic membrane.