Numerical Investigation of Interrupted Microchannel Heat Sink with Multi-Step Rectangular Ribs in the Transverse Microchambers

In this study, the performance of multi-step rectangular ribs and their base surface areas in microchannel heat sinks was investigated numerically using the finite volume method in ANSYS Fluent. To save time and reduce costs, a section of the microchannel was analyzed using the symmetry method. The results indicated that double-step ribs outperformed other step configurations, showing a ۱۴% increase in the thermal enhancement factor, with the Nusselt number and friction factor each increasing by ۲۷.۳% and ۴۱%, respectively. The friction factor initially increased due to vortices generated by the steps, but as the Reynolds number increased, the influence of vortices on the friction factor diminished. Additionally, it was concluded that a larger surface area for the top step of the double-step rib resulted in higher thermal enhancement factors. The configuration with A۲=۱.۵A demonstrated a ۲۵% increase in the thermal enhancement factor, with the Nusselt number and friction factor each increasing by ۴۲% and ۵۱%, respectively. These findings highlight the potential of double-step ribs with larger top step surface areas for optimal performance in thermal management systems, such as electronics cooling, hybrid and electric vehicle power systems, data center servers, avionics, and medical devices like laser systems.

کلیدواژه ها:

Heat transfer ، Microchannel heat sink ، multi-step rib ، Numerical simulation