Topic
Heat pipe
About: Heat pipe is a research topic. Over the lifetime, 30354 publications have been published within this topic receiving 243669 citations. The topic is also known as: heatpipe & heat-pipe.
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TL;DR: In this article, a jumping-droplet-based electric-field-enhanced (EFE) condensation method was proposed to achieve active hot spot cooling in electronic devices.
Abstract: Demand for enhanced cooling technologies within various commercial and consumer applications has increased in recent decades due to electronic devices becoming more energy dense. This study demonstrates jumping-droplet based electric-field-enhanced (EFE) condensation as a potential method to achieve active hot spot cooling in electronic devices. To test the viability of EFE condensation, we developed an experimental setup to remove heat via droplet evaporation from single and multiple high power gallium nitride (GaN) transistors acting as local hot spots (4.6 mm × 2.6 mm). An externally powered circuit was developed to direct jumping droplets from a copper oxide (CuO) nanostructured superhydrophobic surface to the transistor hot spots by applying electric fields between the condensing surface and the transistor. Heat transfer measurements were performed in ambient air (22–25 °C air temperature, 20%–45% relative humidity) to determine the effect of gap spacing (2–4 mm), electric field (50–250 V/cm) and app...
89 citations
TL;DR: In this article, micrombrane-enhanced evaporating surfaces were developed to enhance capillary evaporation heat transfer coefficient ( HTC ) and critical heat flux ( CHF ).
89 citations
TL;DR: In this article, a theoretical Nusselt type analysis is proposed for the condensate film taking into account the drag effects of contra-flowing vapour, and a performance prediction relates rates of heat transfer, rotational speeds, temperature differences across Condensate films, fluid properties and heat pipe geometry.
89 citations
TL;DR: In this paper, the effect of the number of wick layers on the effective thermal conductivity and the heat transfer characteristics of the heat pipes have been investigated, and it was found that the flow behavior of the working fluid depends on the wicking structures and number of Wicks layers.
Abstract: Several heat pipes were designed and manufactured to study the effect of the working fluids, container materials, and the wick structures on the heat transfer mechanism of the heat pipes. Also, the effect of the number of wick layers on the effective thermal conductivity and the heat transfer characteristics of the heat pipes have been investigated. It was found that the flow behavior of the working fluid depends on the wicking structures and the number of wick layers. The heat transfer characteristics and the effective thermal conductivity are related directly to the flow behavior. Increasing the number of wick layers (up to 16 layers) increases the heat flux with smaller temperature differences. The flattening phenomena of the thermal resistance was observed after 16 wicks layers due to the entrainment limit.
89 citations
TL;DR: In this article, a steady-state mathematical model of a loop heat pipe is established and compared with experimental results in this work. And the model can predict the decreasing length of the condenser two-phase zone under the constant conductance mode caused by the volume expansion of the liquid in the compensation chamber, and is in good agreement with the experimental data.
88 citations