Internal Trade Engineering and Research Institute

Beijing, China

Internal Trade Engineering and Research Institute

Beijing, China
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Liu C.-J.,Chengdu University of Technology | Zheng Z.-L.,Chongqing University | Huang C.-B.,Chongqing University | Huang C.-B.,Internal Trade Engineering and Research Institute | And 3 more authors.
International Journal of Structural Stability and Dynamics | Year: 2012

In this paper, the nonlinear instability of dished shallow shells under a uniformly distributed load is investigated. The dimensionless governing differential equations for the problem are derived and the equations solved by using the Free-Parameter Perturbation Method with the Spline Function Method. By analyzing the instability modes of dished shallow shells, we obtain the variation rules of the maximum deflection area of initial instability of the uniformly loaded dished shallow shell, and discuss the relationship between the initial instability area and the maximum deflection area of initial instability. These results provide some theoretical basis for engineering design and instability prediction and control of shallow shell structures. © 2012 World Scientific Publishing Company.

Liu C.-J.,Chongqing University | Zheng Z.-L.,Chongqing University | Huang C.-B.,Chongqing University | Huang C.-B.,Internal Trade Engineering and Research Institute | And 3 more authors.
Mathematical Problems in Engineering | Year: 2011

This paper investigated the nonlinear stability problem of dished shallow shells under circular line loads. We derived the dimensionless governing differential equations of dished shallow shell under circular line loads according to the nonlinear theory of plates and shells and solved the governing differential equations by combing the free-parameter perturbation method (FPPM) with spline function method (SFM) to analyze the nonlinear instability modes of dished shallow shell under circular line loads. By analyzing the nonlinear instability modes and combining with concrete computational examples, we obtained the variation rules of the maximum deflection area of initial instability with different geometric parameters and loading action positions and discussed the relationship between the initial instability area and the maximum deflection area of initial instability. The results obtained from this paper provide some theoretical basis for engineering design and instability prediction and control of shallow-shell structures. © 2011 Liu Chang-Jiang et al.

Xu H.,CAS Technical Institute of Physics and Chemistry | Qian C.,CAS Technical Institute of Physics and Chemistry | Qian C.,Zhongyuan University of Technology | Shao S.,CAS Technical Institute of Physics and Chemistry | And 2 more authors.
Guangxue Xuebao/Acta Optica Sinica | Year: 2014

To improve the heat dissipation performance of the high power solid state laser, a spray cooling system is designed based on the refrigeration cycle, with R600a as the coolant. The heat transfer performance of the closed spray cooling system is studied by experiment. The results show that the heat source surface temperature is affected by the nozzle inlet pressure and spray chamber evaporation pressure. And it is more effective to reduce the surface temperature by reducing the spray chamber evaporation pressure. For example, the decrease of 50 kPa evaporation pressure can result in the reduction of 8℃ of the surface temperature. The nozzle inlet pressure and spray chamber evaporation pressure also have a combined effect on the heat transfer coefficient. It is found that the heat transfer coefficient is up to 35000 W/(m2 ·℃) in the experiment. In addition, the surface temperature standard deviation is mainly affected by the nozzle inlet pressure, and it is hardly affected by the increasing of pray chamber evaporation pressure.

Xu H.,CAS Technical Institute of Physics and Chemistry | Li J.,CAS Technical Institute of Physics and Chemistry | Si C.,CAS Technical Institute of Physics and Chemistry | Si C.,Internal Trade Engineering and Research Institute | And 2 more authors.
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2013

For heat dissipation of the high power solid state laser (HPSSL), a spray cooling system based on refrigerant cycle was designed, and its heat transfer performance was studied. Because the compressor in the refrigerant system needs lubricating, it is inevitable to mix the lubricating oil in the coolant. Lubricating oil has influence on the viscosity, surface tension of the coolant, and may produce oil film, which could strengthen or inhibit the heat transfer process of the coolant. We analyzed the influence of lubricating oil on spray cooling heat transfer performance. The experimental results show that lubricating oil increases the resistance of coolant passing through the nozzle and decreases the coolant flowrate, but as to this system, this influence could be neglected. Lubricating oil enhances the heat transfer performance of coolant, and benefits uniform distribution of the heat source temperature at low heat flux. Lubricating oil also enhances the critical heat flux and heat dissipation ability of the system, making this spray cooling system more beneficial to HPSSL heat dissipation.

Xu H.,CAS Technical Institute of Physics and Chemistry | Si C.,CAS Technical Institute of Physics and Chemistry | Si C.,Internal Trade Engineering and Research Institute | Shao S.,CAS Technical Institute of Physics and Chemistry | Tian C.,CAS Technical Institute of Physics and Chemistry
International Journal of Thermal Sciences | Year: 2014

In order to enhance the heat transfer performance of spray cooling system, an integrated system is developed. The system is based on the refrigeration cycle, and uses isobutane (R600a) as the coolant. The heat transfer performance, such as the heat surface temperature, the heat transfer coefficient and the surface temperature distribution, are experimentally investigated in this paper. When the coolant mass flow rate is nearly 6.9 kg/h, the surface temperature can be kept at 57.3 °C with the heat flux of 145 W/cm2. The heat transfer coefficient can be achieved up to 35,000 W/(m2 °C) when the nozzle inlet pressure and the chamber pressure are 4.9 bar and 2.3 bar, respectively. The surface temperature uniformity is mainly influenced by the mass flow rate, the heat flux and the nozzle inlet pressure together, and the standard deviation of the surface temperature is less than 4.0 °C in this study. All the results indicate that this system is promising in the application for high heat flux removal. © 2014 Elsevier Masson SAS. All rights reserved.