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Interaction phenomena between liquid droplets and hot particles—Captured via high-speed camera

Particuology 2009年第4期7卷 260-263页

作者： sebastian gehrke Karl-Ernst Wirth Institute of Particle Technology Cauerstrasse 4Erlangen 91058Germany

The interaction of evaporating droplets and hot catalyst particles plays a major role in heterogeneously catalysed reactions. The liquid feed is injected into a gas-solid flow and is mixed with the catalyst. The interaction phenomena determine the evaporation time which should be minimised to keep the reactor vessel small. First measurements with a bed of fixed hot FCC-particles （fluid catalytic cracking） and two model fluids have been conducted. The interactions of ethanol and water droplets with the hot bed surface were captured via a high-speed camera. While the ethanol droplet developed a stable steam cushion due to Leidenfrost phenomena, water showed intense interaction and steam explosions which induced repulsion and atomisation of the droplet.

关键词： Particle-droplet-interaction Leidenfrost phenomenon Direct heat transfer Liquid-feed-injection

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Compartment syndrome of thigh and lower leg with disruption of the popliteal vascular bundle after being run over by a 25-ton truck

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Chinese Journal of Traumatology 2013年第5期16卷 308-310页

作者： Rolf D Burghardt Thorsten gehrke Daniel Kendoff Ulrich Stockle sebastian Siebenlist Department of Orthopaedics Helios-Endo KlinikHamburg Hamburg Germany Klinik for Unfall-und Wiederherstellungschirurgie Berufsgenossenschaftlichen Unfallklinik Eberhard-Karls-Universitat Tubingen Schnarrenbergstraβe 95 72076Tubingen Germany Department of Trauma Surgery Klinikum rechts der IsarTechnische Universitat M(3nchen Germany

Compartment syndrome of the thigh is a rare condition, potentially resulting in devastating functional outcome. Increasing intracompartmental pressure which suppresses microcirculation and capillary perfusion may lead to cellular anoxia and muscle ischemia. The muscle com- partments in the thigh have a more compliant fascia and blend anatomically into the open compartments of the pelvis, thus compensating higher volumes than the compartments in the lower leg. We present a previously unreported case in which the limb of a 36-year-old man was run over by a 25- ton truck. He presented with a sensomotor deficit in his left lower leg with full paralysis of the shank muscles and ab- sence of all foot pulses. CT scan showed a huge haematoma in the thigh with active bleeding out of the popliteal artery into the haematoma which has already expanded into the muscle compartments of the lower leg. The limb had a disas- trous compartment syndrome of the thigh and lower leg with disruption of the popliteal neurovascular bundle; however, no bones in the limb were fractured. A complete fasciotomy of all the lower limb muscle compartments was immediately performed. The artery was reconstructed with interposition of the smaller saphenous vein, which was al- ready interrupted through the initial trauma.

关键词： Compartment syndromes Thigh Hemorrhage Popliteal artery Peroneal nerve

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