Topic
Power density
About: Power density is a research topic. Over the lifetime, 9534 publications have been published within this topic receiving 197264 citations. The topic is also known as: volumic power & volume power density.
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TL;DR: In this paper, numerical simulation using a bonded-particle model was undertaken to provide a better understanding of the mechanism of microwave-induced micro-fracture and to predict the effect of microwave power delivery and ore texture on microwave treatment of ores.
74 citations
01 Jan 2011
TL;DR: In this paper, the effect of flow-over and flow-through anode architectures, as well as operating conditions such as different fuel flow rates and concentrations on the performance of LFFCs was investigated.
Abstract: This paper describes a detailed characterization of laminar flow-based fuel cell (LFFC) with air-breathing cathode for performance (fuel utilization and power density). The effect of flow-over and flow-through anode architectures, as well as operating conditions such as different fuel flow rates and concentrations on the performance of LFFCs was investigated. Formic acid with concentrations of 0.5 M and 1 M in a 0.5 M sulfuric acid solution as supporting electrolyte were exploited with varying flow rates of 20, 50, 100 and 200 μl/min. Because of the improved mass transport to catalytic active sites, the flow-through anode showed improved maximum power density and fuel utilization per single pass compared to flow-over planar anode. Running on 200 μl/min of 1 M formic acid, maximum power densities of 26.5 mW/cm 2 and 19.4 mW/cm 2 were obtained for the cells with flow-through and flow-over anodes, respectively. In addition, chronoamperometry experiment at flow rate of 100 μl/min with fuel concentrations of 0.5 M and 1 M revealed average current densities of 34.2 mA/cm 2 and 52.3 mA/cm 2 with average fuel utilization of 16.3% and 21.4% respectively for flow-through design. The flow-over design had the corresponding values of 25.1 mA/cm 2 and 35.5 mA/cm 2 with fuel utilization of 11.1% and 15.7% for the same fuel concentrations and flow rate.
74 citations
12 Nov 2012
TL;DR: In this paper, the effect of parasitics on the performance of high frequency GaN point of load (POL) converters is discussed, and methods to improve the circuit layout of a highly integrated 3D integrated POL module, and the thermal design of a high density module using advanced substrates.
Abstract: The demand for future power supplies to achieve higher output currents, smaller size, and higher efficiency cannot be achieved with conventional technologies. There are limitations in the packaging parasitics, thermal management, and layout parasitics that must be addressed to push for higher frequencies and improved power density. To address these limitations, the use of integrated 3D point of load (POL) converters utilizing GaN transistors, low profile magnetic substrates, and ceramic substrates with high thermal conductivity will be considered. This paper will discuss the effect of parasitics on the performance of high frequency GaN POLs, methods to improve the circuit layout of a highly integrated 3D integrated POL module, and the thermal design of a high density module using advanced substrates. The final demonstration is a 900W/in3 12V 2MHz Alumina DBC GaN converter which offers unmatched power density compared to state of the art industry products and research.
74 citations
TL;DR: In this paper, a three-dimensional thermo-fluid-electrochemical model is developed to study the heat/mass transport process and performance of a solid oxide fuel cell (SOFC).
74 citations
TL;DR: Graphene wrapped nitrogen-doped active carbon fibers (ACF@GR) of a core-shell structure were successfully prepared by a simple dip-coating method using natural silk as template.
73 citations