Diffusion characteristics of plasma nitrided hard chromium on AISI 1010 steel

with a flat ground uranium tailings impoundment as the object of the paper, CFD technology was used to study the atmospheric dynamic diffusion characteristics and the evolution of time and space distribution of radon in the uranium tailings impoundment. Results show that, within 1500m range of the leeward of uranium tailings impoundment the falling gradient of radon mass fraction improves with distance increases at the same moment, however the falling gradient flattens with the increase of time gradually; During the first 30 minutes, the radon mass fraction of tailings impoundment in the leeward direction has a larger growth gradient, then flattens out slowly, and stabilizes after 75 minutes.

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Diffusion characteristics of boron and phosphorus in polycrystalline silicon

Thin Solid Films ◽

10.1016/0040-6090(83)90281-x ◽

1983 ◽

Vol 100 (3) ◽

pp. 235-248 ◽

Cited By ~ 25

Author(s):

A.D. Buonaquisti ◽

W. Carter ◽

P.H. Holloway

Keyword(s):

Polycrystalline Silicon ◽

Diffusion Characteristics

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Effects of Wind on the Heat Flow of FPSO Topsides Subject to Fire: An Experimental and Numerical Study

29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 2 ◽

10.1115/omae2010-20761 ◽

2010 ◽

Author(s):

Joon Young Yoon ◽

Seong Hwan Kim ◽

Gwon Cheol Yu ◽

Jung Kwan Seo ◽

Bong Ju Kim ◽

...

Keyword(s):

Thermal Diffusion ◽

Numerical Study ◽

Wind Tunnel Test ◽

Experimental Results ◽

Test Facility ◽

Test Model ◽

Cfd Simulations ◽

Fire Engineering ◽

Diffusion Characteristics ◽

Fire Loads

The aim of this paper is to examine the effect of wind on the thermal diffusion characteristics of floating production storage and offloading (FSPO) topside models subject to fire. It is motivated by the need to identify the fire loads on FPSO topsides, taking into account the effects of wind speed and direction. The results of an experimental and numerical study undertaken for these purposes are reported here. This paper is part of Phase II of the joint industry project on explosion and fire engineering of FPSOs (EFEF JIP) [1]. An experiment was performed on a 1/14-scale FPSO topside model using a wind tunnel test facility. The locations of the heat source of the fire were varied, as were the speed and direction of the wind, and the temperature distribution was measured. Computational fluid dynamics (CFD) simulations using the ANSYS CFX program were performed on the test model, with the results obtained compared with the experimental results. It is concluded that wind has a significant effect on the thermal diffusion characteristics of the test model and that the CFD simulations are in good agreement with the experimental results. The insights developed in this study will be very useful for the fire engineering of FPSO topsides.

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