Heat fluxes in IC chips and other electronics equipment have reached the current limits of air cooling technology. Some of the applications require heat fluxes well beyond the limit of 100 W/cm, requiring advanced cooling solutions. Liquid cooling technology has been receiving attention as the advances in single-phase liquid cooling in microchannels have shown considerable promise. The extensio...

Many fluids of hydrocarbon derivatives were used as working fluids in refrigeration and air conditioning during the past few decades. The phase out of chlorofluorocarbons and hydrochlorofluorocarbons has initiated research on finding an alternative working fluid for the existing. In this article, some working fluids with zero ozone depletion potential have been assessed for their suitability as...

Boiling conjugate heat transfer is an active field of research encountered in several industries, including metallurgy, power generation and electronics. This paper presents a computational fluid dynamics approach capable accurately modelling the flow phenomena during immersion quenching: process which hot solid immersed into liquid, leading to sudden boiling at solid–liquid interface. The adop...

This study develops robust numerical algorithms for the simulation of three-phase (solid-liquid-gas) boiling and bubble formation problems in rectangular channels. The are based on Finite Volume Methods (FVM) implement both volume-of-fluid (VOF) methods liquid-gas interface tracking as well volume-fraction to account concentration embedded solid nano-particles liquid phase. Water is used base-l...

It’s believed that the macrolayer plays an important role in nucleate and transition boiling heat transfer at high heat flux. Many experiments have been carried out to support the macrolayer evaporation model, however, little has been conducted in the numerical simulation of boiling heat transfer. In this study, based on the macrolayer evaporation model of Maruyama et al. (1992), a numerical si...

In the present work, functionalized 304 stainless steel metallic surfaces were created with the use of a Femtosecond Laser Surface Processing (FLSP) technique. The laser processing technique produces self-organized micro/nanostructures on the surface. The heat transfer performance of various FLSP functionalized surfaces were characterized through pool boiling and Leidenfrost experiments. Enhanc...

The interaction between a liquid droplet and hot granular material is explored in this work. Surprisingly, we found that the deeply penetrated into when temperature exceeds boiling of liquid. digging speed drop decreases with temperature. A mechanism based on Leidenfrost effect proposed considering can be modeled as rough surface eroded vapor sufficient.

New calculus of the liquid-gas phase transition is developed for the boiling of nuclear liquid in the micro-canonical ensemble. In contrast to the familiar geometrical construction, the temperature and the chemical potentials are determined from de…nite values of baryon densities and pressure. We recover the concave maximized entropy in the phase transition against the common tangent …lling up ...

The fractal nature of hydrodynamic features during nucleate boiling is illustrated in this study. Earlier reports in the literature explored the fractal nature of the thermal features in pool boiling. In these studies typically the time-delay technique was used to obtain chaos quantifiers in boiling from wall temperature fluctuation measurements. In this study experiments were performed at diff...