Papers by Keyword: Hot Wall

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Authors: Marco Mauceri, Antonino Pecora, Grazia Litrico, Carmelo Vecchio, Marco Puglisi, Danilo Crippa, Nicolo’ Piluso, Massimo Camarda, Francesco La Via
Abstract: Preliminary results of 150mm SiC 4H 4°off have been obtained with the new 150mm automatic horizontal hot wall reactor PE1O6, using chlorinated chemistry (SiHCl3 + C2H4). A new injection system has been tested in two configurations and results will be shown in this paper. AFM surface roughness measurements and epi defect density have been reported.
Authors: Matteo Bosi, Giovanni Attolini, Marco Negri, Cesare Frigeri, Elisa Buffagni, Claudio Ferrari, Tiziano Rimoldi, Luigi Cristofolini, L. Aversa, Roberta Tatti, R. Verucchi
Abstract: We describe a procedure for the optimization of a 3C-SiC buffer layer for the deposition of 3C-SiC on (001) Si substrates. A 100 – 150 nm thick SiC buffer was deposited after a standard carbonization at 1125 °C, while increasing the temperature from 1125 °C to 1380 °C. Ramp time influenced the quality and the crystallinity of the buffer layer and the presence of voids at the SiC/Si interface. After the optimization of the buffer, to demonstrate its effectiveness, a high-quality 3C-SiC was grown, with excellent surface morphology, crystallinity and low stress.
Authors: Yi Hong Ou, Hai Bing Qian, Yang Du, Rong Fan, Xing Sheng Jiang
Abstract: The purpose of this paper is to explore difference between the first thermal ignition and the secondary thermal ignition, and to reveal the variation rules of characteristic parameters and critical condition ignition for the secondary thermal ignition of gasoline-air mixture. In this paper, experimental investigation on the gasoline-air mixture secondary ignition induced by hot wall in model underground oil depots tunnel has been carried out. Compared to the first thermal ignition, the ignition intensity of the secondary thermal ignition is greater, while the ignition delay and duration are shorter. After the first thermal ignition extinguish, if the ambient temperature is in the range of 286K to 463K and hot wall’ temperature is in the range of 730 to 783K, then the relation between critical ignition temperature and the ambient temperature can be expressed by cubic polynomial. The critical ignition concentration of gasoline vapor is only 0.45% and that of oxygen is 10.4%.
Authors: Andrew J. Trunek, Philip G. Neudeck, Andrew A. Woodworth, J. Anthony Powell, David J. Spry, Balaji Raghothamachar, Michael Dudley
Abstract: Lateral expansion of small mixed polytype 4H/6H-SiC and 6H-SiC slivers were realized by hot wall chemical vapor deposition (HWCVD). Small slivers cut from m-oriented (11 ̅00) SiC boule slices containing regions of 4H and 6H-SiC or just single polytype 6H-SiC were exposed to HWCVD conditions using standard silane/propane chemistry for a period of up to eight hours. The slivers exhibited approximately 1500 μm (1.5 mm) of total lateral expansion. Initial analysis by synchrotron white beam x-ray topography (SWBXT) confirms, that the lateral growth was homoepitaxial, matching the polytype of the respective underlying region of the seed sliver.
Authors: Yi Hong Ou, Xing Sheng Jiang, Hai Bing Qian, Dong Wang, Jian Jun Liang, Yang Du
Abstract: The purpose of this paper is to find a efficient model to simulate the thermal ignition of gasoline-air mixture. First, Detailed chemical reaction model of gasoline-air mixture thermal ignition is discussed. that is, chemical reaction chains of controlling of thermal ignition are got according to the characteristic of gasoline-air mixture; through sensitivity analysis of temperature and species concentration, reaction equations are selected within a certain temperature range; based on the relation between chemical reaction rate of species and thermodynamic parameters, both the rate of species consumption or production and the heat release rate of species chemical reaction are got. Then using low mach, compressible equation as control equations, coupling the detailed chemical reaction model and radiation model, the mathematical model of gasoline-air mixture thermal ignition process, namely comprehensive model,has been established on the basis of unification of chemical kinetics and thermodynamics in this paper. In the end, taking gasoline-air mixture thermal ignition due to contacting with hot wall continuously where temperature is raising in a confined insulation space as example, this paper complete the numerical simulation analysis based on the comprehensive model. The result is demonstrated by the experiment data.The research result shows that the comprehensive model, in which fluid field, boundary conditions and detailed chemical reaction control together is efficient for gasoline-air mixture thermal ignition.
Authors: Hong Guo Ren, Gui Wen Li, Xiu Mu Fang
Abstract: In order to satisfy the requirement of villages indoor thermal amenity in winter in cold district in north of china, thermal performance of level, vertical flue smoke organization form hot wall have been tested. The experiment use Testo flue gas analyzer, BES-C portable computer multi-channel data acquisition instrument, the infrared thermography and so on to acquire basic data of two type flue layouts hot wall. These parameters include smoke composition, the inport and export smoke temperature, smoke quantity, metope temperature of hot wall and so on. And then record the test data, calculate evaluation index of the thermal performance, which are metope temperature standard deviation, thermal inertia and heat efficiency, etc. According to the value of the heat efficiency, we can judge the thermal performance of two kind of hot walls. The test results shows that the heat efficiency of level flue smoke organization form is 68.9%, and the heat efficiency of vertical flue smoke organization form is 62.1%. The heat efficiency of hot wall in the form of level flue is higher, better meet the requirement of heating facilities in energy saving, residents thermal amenity.
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