Akademik Veri Yönetim Sistemi
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, cilt.172, 2026 (SCI-Expanded, Scopus)
Developing chip technology causes cooling to become increasingly important in terms of sustaining technology. Therefore, advanced micro-heat-sink designs with forced liquid flow have critical potential. Here, first time, the combined role of surface roughness and pin-fin layout with variable fin number in single-phase flow in micro heat sinks were numerically investigated. There are three heat sinks including (1) conventional rectangular (CON-1), (2) uniform pin-fin distribution (CON-2) and (3) staggered and decreasing fin number (CON-3) designs, respectively. These designs were roughened at different levels to simultaneously study effect of relative roughness (0 %, 0.71 %, 1.42 %, 2.18 %, 2.84 %, 4.26 %). Regarding thermo-fluidic characteristics, periodic boundaries were used, and a range of Reynolds number of 300-700 was considered, addition to constant heat flux condition. 3D-Gaussian model was the tool to rough surface. It was concluded that combination of roughness with staggered orientation and decreasing fin number significantly improved thermal performance. In this regard, for relative roughness of 4.26 %, CON-3 presented higher average Nusselt number (Nuavg) by 8.2 % and 87.3 % respectively, compared to CON-2 and CON-1. At same roughness, performance factor (PF), included also effect of pressure drop, was 4.1 for CON-3; while PF values are 3.8 and 2.8 for CON-2 and CON-1, respectively.