Thermal analysis of Al₂O₃/water nanofluid-filled micro heat pipes

Abstract

The comparison of heat transport capacity and the thermal resistance as the performance indicators provides valuable insights into the underlying physical significance of the use of a nanofluid on the performance of micro heat pipes.

Effects of Tube Radius and Surface Tension on Capillary Rise Dynamics of Water/Butanol Mixtures

“…In particular, the cooling of modern electronic devices requires a suitable configuration for high-performance devices with reduced-size because heat loads and heat fluxes increase exponentially [5,6]. In light of the continued miniaturization of electronic components, micro heat pipes are promising micro-scale cooling devices and their operation is sustained by two-phase heat transfer and capillary forces [7]. Therefore, capillary-based flows can replace electric pumps that consume space Appl.…”

Effect of operating parameters on the transient behavior of gravity-assisted heat-pipe using radio-chemically prepared Al 2 O 3 nano-fluid

“…and Hung[33], however, intro-386 duced an equation for calculating the latent heat of a nanofluid,387 incorporating the volume fraction of the nanoparticles and the den-388 sities of both the nanofluid and base fluid using a lever rule.The average heat transfer coefficient between the condenser 390 surface and cooling water is calculated separately in cases of lam-391 inar and turbulent flow regimes as follows.…”

“…The heat pipe is divided into two heat carriers; evaporator and condenser. An 33 energy balance for each carrier is carried out to estimate temperatures, heat transfer coefficients, thermal 34 resistances, time constants, and other thermal characteristics at three different heat loads; 500, 1000, and 35 1500 W. Governing equations of the transient behavior can be simplified into first-order linear ordinary 36 differential equations, which can be solved by the linear algebra formalism method yielding the heat-pipe 37 temperatures. The transient response of a gravity-assisted heat pipe is found to depend mainly on the 38 average evaporator thermal resistance.…”

Gravitational effects on electroosmotic flow in micro heat pipes

“…Micro heat pipe – a microscale electronics cooling device, has received considerable interests among the thermal management community. In view of the demanding needs for electronics cooling and advances in miniaturization of electronic components, micro heat pipe manifests itself to be a very promising candidate for effective cooling of electronic equipment, because of its high reliability, efficiency and cost-saving features (Babin et al , 1990; Suman, 2009; Liu and Chen, 2013; Gan and Hung, 2015; Sun et al , 2017; Qu et al , 2017; Ye et al , 2018; Yoon and Kim, 2018; Chen et al , 2019; Wang et al , 2019). Micro heat pipe is a heat transfer device with extremely high thermal conductance.…”