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Analysis of thermal and wet stress of corn kernel based on microwave drying
Tongsheng Sun,Ran Cao 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.3
In order to reveal the relationship between temperature, moisture content and stress during microwave drying, the paper establishes a mathematical model of heat and mass transfer as well as stress during microwave drying using corn kernels as the medium, and couples the two models to solve the electromagnetic equation, energy and momentum conservation and stress equation, and conducts experimental verification. The results show that the maximum errors between the simulated and experimental values of temperature and moisture content are 8.04 % and 9.21 %, respectively, and the theoretical model can be used to simulate the changes of temperature, moisture content and stress of corn kernels. Under the set drying conditions, the thermal stress increased with increasing temperature, and the stress maximum was obtained on the upper and lower surfaces of the seeds. The wet stress increased with increasing moisture gradient, and the stress and crack index were maximum at a moisture content (dry basis) of 16.13 %.
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Jieying He,Tongsheng Chen 대한금속·재료학회 2023 ELECTRONIC MATERIALS LETTERS Vol.19 No.1
Synthesis of anatase titanium dioxide (TiO 2 ) catalysts with excellent photocatalytic activity is of great importance in photocatalyticapplication. In this work, a cross-like anatase TiO 2 structure is obtained by thermal treatment of precursors synthesizedin an electrochemical cell with mixed phases of (NH 4 ) 2 TiOF 4 and NH 4 TiOF 3 . When calcined at various temperatures,these obtained anatase TiO 2 products could preserve their original morphologies and structures until 750 °C and kept anatasephase from rutile till 900 °C showing better thermal and structural stability, which was probably associated with fl uoridecontents on the surface of anatase TiO 2 products after conversion from (NH 4 ) 2 TiOF 4 and NH 4 TiOF 3 precursors. The photocatalyticactivity of prepared TiO 2 samples over methyl orange is investigated. The photocatalytic activity of mesocrystallineTiO 2 cross decreases with the increase of the calcination temperature of ammonium oxofl uorotitanates except for a bestperformance at 600 °C. The calcination temperature-dependent catalytic performance of the products could be ascribed tothe removal of fl uorine, nitrogen, or hydroxyl radicals on the surface, and the change of crystallinity and crystallite size withvarying heating temperatures. The results indicated that anatase TiO 2 mesocrystals calcined at 600 °C showed the highestphotocatalytic performance more likely owing to well-defi ned morphology, good microstructure, and suitable crystallite size.
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Precision machining of high aspect-ratio rotational part with wire electro discharge machining
Yingmou Zhu,Tongsheng Liang,Lin Gu,Wansheng Zhao 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.3
Precision and micro rotational parts are widely used in various industries, such as micro probes for medical instruments, contact pins for micro assembly applications, micro electrodes for micro Electrical discharge machining (μ-EDM) or micro Electro-chemical discharge machining (μ-ECDM). In this research, a uniform annular area layer by layer feeding strategy was proposed to fabricate high aspect ratio, small radii rotational components on a conventional Wire electrical discharge machining (WEDM) machine equipped with an auxiliary spindle. The uniform annular area layer by layer feeding strategy consisted of the roughing and finishing stages. First, the theoretical Material removal rate (MRR) and radial infeed rate for each layer were determined for the roughing stage, and the theoretical surface roughness, R z in the finishing stage was researched. Then, a series of optimization experiments were conducted to investigate the influence of the parameters on MRR and the machined surface roughness. A group of pin electrodes were machined by applying this feed strategy with the optimized parameters, and the minimum diameter of the pin electrodes was 40 μm with an aspect-ratio of 60. Finally, micro electrodes for an injection nozzle were achieved with this novel process and a qualified injection nozzle for powder metallurgy was fabricated with the machined micro electrodes.
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Analysis of multi-coalbed CBM development methods in western Guizhou, China
Zhaobiao Yang,Yong Qin,Tongsheng Yi,Jun Tang,Zhengguang Zhang,Congcong Wu 한국지질과학협의회 2019 Geosciences Journal Vol.23 No.2
After more than 20 years of development, the exploration and production of multi-bed coalbed methane in western Guizhou is now in a key growth phase. Based on geological characteristics of CBM and requirements of main development engineering in this area, we have looked into suitable fracturing and drainage modes for this area. This study shows that the Liupanshui coalfield has a high stress field, so staged fracturing with large discharge and high volume of fracturing fluid and sand and increase of the used quantity of high strength ceramic beads is effective for this kind of multi-bed coal reservoir. In contrast, Zhina coalfield has a relatively low stress field, and the Qianbei coalfield has transitional stress conditions. Separate layer fracturing by sleeve diverter in the Zhijin block ensures effective fracturing of multi-production layers. This method enhances fracturing efficiency and decreases fracturing cost and is therefore recommended for the whole area. Coiled tubing fracturing widely used in other countries is recommended for the Zhina and Qianbei coalfields. Commingled drainage and production is considered the best choice for the development of multi-bed CBM reservoirs. The basic geologic conditions for commingled drainage production of multiple layers are that the main productive layers can be ensured to produce gas preferentially and smoothly and the critical desorption pressure liquid level of other productive layers are above the roof depth of the main productive layers. On this basis, all the layers can be produced in an orderly manner by regulating the casing pressure and liquid level depth in different draining phases.
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