The current study investigates capillary-fed boiling of water from porous sintered powder wicks used in emerging high-effective-conductivity vapor chamber heat spreaders intended for management of hot spots with heat fluxes exceeding 500 W cm -2 . Characterization of 1 mm-thick wicks composed of 100 μm sintered copper particles is performed in a test facility which replicates the capillary feed...

A compact packaging module for direct liquid cooling of roomtemperature quantum cascade lasers is implemented. The light was coupled out of the hermetically sealed package through a mid-infrared fibre epoxy-bonded to the laser. The threshold current reduces by 10%, compared to convectional substrate-side cooled lasers when using low boiling temperature (boiling point (b.p.)1⁄4 34 C) 3M HFE7000 ...

• A MCHS to cool CPV under transient heat flux was investigated numerically. Flow boiling instability affected by the were investigated. Two-phase flow pattern different sudden increase studied. With from 97.96 580 kW/m2, duration of rapid development period increased 0.03 s 0.066 s. Fluctuation intensity pressure drop in quasi-stable 0.025 0.193. Concentrated photovoltaic (CPV) overheating due...

Pool boiling experiments were conducted in microgravity on five space shuttle flights, using a flat plate heater consisting of a semitransparent thin gold film deposited on a quartz substrate that also acted as a resistance thermometer. The test fluid was R-113, and the vapor bubble behavior at the heater surface was photographed from beneath as well as from the side. Each flight consisted of a...

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...

Dioxane and water form a positive homoazeotrope which has an azeotropic decrease in temperature sufficiently large to effect the complete r emoval, by fractional distillation through an efficient column, of water present as an impurity. The boiling-point-composition diagram, including the composition of the vapor in equilibrium with the boiling liquid, was determined. The normal boiling point o...

Published studies concerning transport phenomena in micro-channel heat sinks can be divided into those concerning saturated boiling versus those focused on subcooled boiling, with the vast majority related to the former. What has been lacking is a single generalized method to tackle both boiling regimes. The primary objective of the present paper is to construct a consolidated method to predict...

In this paper the heat transfer characteristics of a two-phase closed thermosyphon over a wide range of heat transfer rates, system pressure, aspect ratios and filling ratios were studied. The experiments focused on the boiling and condensation heat transfer characteristics of the thermosyphon. The experimental boiling and condensation heat transfer coefficients inside the thermosyphon were com...

• Experimental investigations on the boiling process in desorbers are reviewed. Compact membrane and plate based represent trend desorber design. The main contributors to diffusion, convective nucleate boiling. Correlations reported from Absorption technology becomes an attractive option for cooling or heating when driven by solar thermal energy, residual heat different processes, geothermal en...

Boiling is a complex phenomenon where different non-linear physical interactions take place and for which the quantitative modeling of mechanism involved not fully developed yet. In last years, many works have been published focusing on numerical analysis this problem. However, lack assessing quantitatively sensitivity these simulations to grid parameters can be identified, especially Lattice B...