Materials Science, Mechanical Engineering and Applied Research

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Authors: Bin Sun, Xin Cong Zhou
Abstract: This paper discusses the source and harm of the hydraulic oil pollution, the connotation of oil monitoring technology, methods, instruments and basic principle of the oil monitoring, and states the feasibility and importance of oil monitoring technology from two failure cases in the hydraulic system of the ship.
Authors: Qiao Dong Bai, Chun Sheng Weng
Abstract: Experimental studies were performed to investigate the ejector’s effect on the performance of a pulse detonation rocket engine (PDRE). The PDRE employed in the experiments utilizes gasoline as fuel and air as oxidizer. The operating frequency of the PDRE is 10 and 20 Hz respectively. Performance is quantified by thrust measurements, and the average thrust of the PDRE is obtained by integration of the thrust measured in the experiment. The experimental results show that the PDRE can increase thrust augmentation with an ejector, a maximum thrust augmentation is measured by 18.7% at 10 Hz operating frequency. In the experiment, axial placement (X/DPDRE) of the ejector is varied downstream the PDRE tube of 0.5,1 and 2 respectively. It is found that the thrust augmentation obviously increases when the relative position at 1 and 2, and also the thrust augmentation increases at higher operating frequency. The experiment result is useful for the development of a PDRE producing higher thrust.
Authors: Rong He, Nai Jun Zhou, Bin Bin Dai
Abstract: A cooling plate with staggered micro-groove structure was designed to replace traditional straight groove structure which cannot meet the VSC-HVDC cooling requirement. On the basis of reasonable physical and mathematical models, the thermal process was simulated based on Icepak, and experiments were designed to verify the reliability of the numerical simulation results. Results showed that the thermal resistance of experimental is 0.00538K/W and pressure drop is 1.03bar, which can meet the technical requirement; The differences of pressure drop and thermal resistance between simulation and test results are 9.4% and 7.4% respectively. It also provides an important method for the design and improvement of cooling plate in engineering application.
Authors: Long Sheng Wu, Xu Zhang, Cheng Jian Wang, Zhen Long Wang
Abstract: Phase change cooling technology is based on the boiling of refrigerating medium to absorb the heat generated by the electronic chip. It provides higher heat flux dissipation, reduces the refrigerating medium flux and consumes a lower pumping power, compared with single-phase liquid cooling. It also has good temperature uniformity and higher working temperature, which is ideal for energy reuse. Experimental system was designed for phase change cooling of R123 to analyze the basic conditions required for boiling vaporization. The chip temperature was 70 °C or less when the heat flux was 100 W·cm-2, with the 0.6 mm rectangular micro-channel evaporator. Experiments were conducted to analyze the effects of heat flux, channel dimension, throttling action on the heat transfer effect.
Authors: Hua Xiang Zhou, Zheng Zhou, Jing Ping Liu
Abstract: In order to obtain the radiation heat transfer theory and calculation methods, the movement of the gas particles, location, intensity, temperature, are researched in cylinder under different conditions with combustion system and the mode of heat transfer. Under high temperature conditions in the cylinder, the gas radiation heat transfer is researched in the complex heat transfer theory. A statistical correlation K narrow band model, a mean absorption coefficient, a gas line databases, by-line calculation method are found, through research and analysis emissivity, transmittance, absorption coefficient, typical models, mathematical equations, database, calculation methods. Examine the distribution performance of each database for different media concentration and temperature, a statistical narrow-band band parametric model accuracy is tested, using statistical narrow band model, the results of the use of by-line method. Research shows: selected spectral database, calculation method has a greater impact on the results. The research also shows the result coincides calculations based by-line HITEWP2010 database method, whether radiant heat or wall flux, statistical narrow band model. These are supplied to the internal combustion engine cylinder design.
Authors: Zhi Bin Yang
Abstract: In this paper we found two catalysts exhibit high catalytic activity and stability during the partial oxidation of methane (POM) in Coke oven gas (COG) in BCFNO membrane reactor. Such as the NiO/MgO catalyst, we discussed the COG and air flow rate on the performance of reforming of COG. The results show that the NiO/MgO catalyst exhibits high activity. The experimental result of the CH4 conversion, selectivity of H2 and CO were suited well to the result of thermodynamic analysis. And the LiNiCeO/γ-Al2O3 catalyst, we discussed the LiNiCeO/γ-Al2O3 catalysts with different amount CeO2 in order to compare the reaction performance on the membrane reactor. The results show that the oxygen permeation flux increased significantly with increasing the amount of CeO2 during the POM in COG. Such as, the LiNi15%CeO/γ-Al2O3 catalyst with a oxygen permeation flux of 10.6 ml⋅cm-2⋅min-1 and a 100% CH4 conversion were obtained at 875 oC.
Authors: Hai Ping Zhu
Abstract: The models for impact energies of gas-solid flows are proposed based on the governing equations of the flows, and then applied to investigate the energies of the gas-solid flow in a model blast furnace (BF). The kinetic energy, contact and friction energy dissipations, and energy dissipation from fluid – particle interactions are examined. The effect of solid flow rate on the energies is also studied. The results indicate that the distributions of the energies are related to the flow pattern of the solid flow.
Authors: Yong Ming, Yong Guo, Nai Jun Zhou
Abstract: Aim at developing power generation technology using the waste heat of the cell sidewall, a heat recycle installation was designed and used for recycling heat of the sidewall of a 400kA aluminum reduction cell. A 3D slice finite element model of aluminum reduction cell was established by using ANSYS finite element analysis software, and the coupled thermo-electric simulation for a 400kA cell was analyzed under installing the exchanger or not. The simulation results show the average temperature of main heat dissipation area of the cell is significantly decreased after installing the exchanger, and the thickness of freeze would also increase 1.7cm, which benefits in decreasing the heat dissipation and protecting the lining of the cell.
Authors: Xiao Xia Xia, Nai Jun Zhou, Zhi Qi Wang
Abstract: The energy consumption of several central air conditioning systems in summer was researched by the method of exergy analysis. Combined with actual example,the exergy loss of all the equipments and the exergy efficiency of three systems were calculated. The results show that the exergy efficiency of three systems is very low. Relatively speaking, the exergy efficiency of primary return air conditioning system with supplying air in dew point is highest. The equipment of highest exergy loss is air-conditioned room, while the exergy loss of surface air cooler is smallest. Based on this, several improvement measures were proposed to reduce exergy loss and improve exergy efficiency.
Authors: Wen Ying Shi, Hong Bin Li, Rong Zhou
Abstract: A sulfonated polyethersulfone (SPES)/polyethersulfone (PES) blend catalytic membrane was prepared and used as a heterogeneous catalyst in the esterification of oleic acid with methanol for producing biodiesel. Response surface methodology (RSM) based on central composite design (CCD) was used to optimize the three important reaction variables methanol/oleic acid mass ratio, catalytic membrane loading and reaction time for the esterification by SPES/PES blend catalytic membrane. The optimum condition for the esterification was as follows: methanol/oleic acid mass ratio 1:1, catalytic membrane loading 1.66 meq/g, reaction time 6 h. The optimum predicted fatty acid methyl ester (FAME) yield was 97.44% and the actual value was 98.64%. The above results shows that the RSM study based on CCD is adaptable for FAME yield studied for the current esterification system.

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