The hydraulic‐thermal performance of miniature compact heat sinks using SiO₂‐water nanofluids

Abstract

Ever since the rapid increase in both the demand for the miniature electronic devices and their applications, heat dissipation in the electronic components has been a serious issue. A miniature plate‐pin heat sink model with square, circular, and elliptic pins is considered to enhance the hydrothermal performance of this kind of compact heat sink (CHS). Water and 3% of SiO2‐water nanofluids of volume fraction were used with different Reynolds number ranges (100‐1000). The findings show that the base temperature of heat sink reduces while the Nusselt number enhances by using nanofluids and increasing Reynolds number. The lowest value of the base temperature is nearly 25% for the square pins and circular pins CHSs compared with a plate–fin heat sink at 3% of nanofluids. Furthermore, the highest value of the Nusselt number is about 98% at 3% SiO2 for circular pin CHSs compared with the plate–fin heat sink. However, the pressure drop of CHSs is higher than that of plate–fin heat sink. Moreover, the most significant hydrothermal performance value is about 1.44 for water and around 1.51 for SiO2 as using the CHS with circular and elliptic pins depends on the Reynolds number. Thus, applying CHSs with nanofluids instead of the traditional heat sinks might produce a substantial enhancement in the hydrothermal performance of heat sinks.

Three‐dimensional computational comparison of mini pinned heat sinks using different nanofluids: Part one—the hydraulic‐thermal characteristics

“…The most considerable value of dissipation rate is for SiO 2 –H 2 O nanofluids nearly 25% greater than pure water for different pumping power because the thermal conductivity of SiO 2 ‐water and the mass flow rate are higher than that of pure water and other nanofluid types (Brownian motion). This finding is confirmed with the numerical results of Fadhil et al and experimental data of Zirakzadeh et al…”

Three‐dimensional computational comparison of mini‐pinned heat sinks using different nanofluids: Part two—energy and exergy characteristics

“…The thermal fluids have recommendable thermal properties; such nanofluids which have particularly favorable thermal conductivity compared with other base coolant fluids as oil, water, glycerine, etc. Since the thermohydraulic characteristics of nanofluids are worthy, therefore, different sorts of nanofluids are applied in many engineering applications—traditional and compact HSs, solar energy, heat pipes, thermal energy storage, and free and forced convection . However, these applications using nanofluids have some limitations that cannot be neglected.…”

Numerical Investigation of Nusselt Number for Nanofluids Flow in an Inclined Cylinder

“…If the value of NUR greater than 1 indicated that the heat transfer rate is enhanced on that fluid, whereas reduction of heat transfer is indicated when NUR is less than 1 (Fadhil et al , 2019). The present study was conducted for both the constant heat flux ( " = 10,000 W/m 2 ) and constant wall temperature (Tw = 313.15 K) boundary conditions.…”