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	1. Couple Heat Transfer inside an Anisotropically Scattering Medium with a semitransparent surface and a opaque surfac
	Yi Hongliang,Tan Heping
	Dynamic and Electronic Engineering 07 November 2006
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	Abstract:Transient combined heat transfer by radiation and conduction is investigated within a participating nongray planar slab with one surface coated. Anisotropic scattering is included. By the modified ray tracing method, a radiative transfer model is developed and radiative transfer coefficients (RTCs) under specular reflection are deduced. Five spectral bands are used to simulate radiative spectral properties of translucent material. Radiative source term is calculated by RTCs. Transient energy equation is solved by the full implicit control-volume method under the external radiative and convective boundary conditions. The influences of scattering characteristics such as various scattering phase functions and scattering albedo values on the transient thermal behavior are examined. According to numerical results obtained in this paper, it is found that fully backward scattering, fully forward scattering and forward mixed scattering make a great difference in transient temperature distributions and steady-state total heat flux with isotropic scattering case as a reference.
	TO cite this article:Yi Hongliang,Tan Heping . Couple Heat Transfer inside an Anisotropically Scattering Medium with a semitransparent surface and a opaque surfac[OL].[ 7 November 2006] http://en.paper.edu.cn/en_releasepaper/content/9329


	2. Numerical simulation and field synergy analysis of heat transfer performance of radial slit fin surface
	Zhou Junjie ,Wu Zhigen ,Tao Wenquan
	Dynamic and Electronic Engineering 18 October 2006
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	Abstract:In this paper, the finite volume method is used to numerically simulate the laminar heat transfer performance of a plate fin-and-tube heat exchanger surface with radially positioned slots. The problem is of conjugated type in that the fin temperature distribution is determined during the computation process. The heat transfer performance of a plain plate fin-and-tube surface is also computed for comparison. Computations are performed at the different frontal velocity, ranging from 1 m/s to 3 m/s under three constraints: identical mass flow rate, identical pressure drop and identical pumping power. It is found that the Nusselt number and the friction factor of the two types of plate fin surfaces can be well correlated by power law equation. At the identical pumping power or the identical pressure drop the performance of the slotted fin surface is much better than that of the plain fin surface, while under the identical mass flow rate, the performance of the slotted fin is inferior to that of the plain plate fin. The field synergy principle is applied to reveal the difference of synergy between the velocity and temperature gradient for the two types of plate fin surfaces, and it is found that where there is an enhanced heat transfer there is a better synergy between velocity and the fluid temperature gradient
	TO cite this article:Zhou Junjie ,Wu Zhigen ,Tao Wenquan . Numerical simulation and field synergy analysis of heat transfer performance of radial slit fin surface[OL].[18 October 2006] http://en.paper.edu.cn/en_releasepaper/content/8804


	3. Experimental verification of the field synergy principle
	Ma LiangDong,Li ZengYao,Tao WenQuan
	Dynamic and Electronic Engineering 18 October 2006
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	Abstract:In this paper, the basic idea of the field synergy principle (FSP) is briefly reviewed and is validated experimentally by incompressible flow through a square duct with an imposed temperature difference between vertical walls and perfectly insulated on the horizontal walls. This creates a situation where the steamwise flow velocity is normal the cross section temperature gradient. The experimental results show the independency of crosswise heat transfer rate on the steamwise flow velocity. Detailed discussion is provided to account for some minor deviation from the expected results of FSP
	TO cite this article:Ma LiangDong,Li ZengYao,Tao WenQuan. Experimental verification of the field synergy principle[OL].[18 October 2006] http://en.paper.edu.cn/en_releasepaper/content/8794


	4. Cooling of Laser Slab by Forced Convection through a Heat Sink
	Junrong Wang,Yaozu Song,Jingchun Min
	Dynamic and Electronic Engineering 22 December 2005
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	Abstract:The present study addresses a novel cooling scheme for the high-power solid-state laser slab. The scheme cools the laser slab by forced convection in a narrow channel through a heat sink. Numerical simulations were conducted to investigate the thermal effects of a Nd:YAG laser slab for heat sinks of different materials including the undoped YAG, sapphire and diamond. The results show that the convective heat transfer coefficient is non-uniform along the fluid flow direction due to the thermal entrance effect, causing a non-uniform temperature distribution in the slab. The heat sink lying between the coolant fluid and the pumped surface of the slab works to alleviate this non-uniformity and consequently improves the thermal stress distribution and reduces the maximum thermal stress of the slab. It is found that the diamond heat sink is effective in reducing both the highest temperature and the maximum thermal stress, the sapphire heat sink is able to reduce the maximum thermal stress but is not so effective in reducing the highest temperature, the undoped YAG heat sink reduces the maximum thermal stress but tends to increase the highest temperature. Therefore, cooling with the diamond heat sink is most effective, that with the sapphire heat sink follows, whereas that with the undoped YAG heat sink may not apply if the highest temperature is a concern.
	TO cite this article:Junrong Wang,Yaozu Song,Jingchun Min. Cooling of Laser Slab by Forced Convection through a Heat Sink[OL].[22 December 2005] http://en.paper.edu.cn/en_releasepaper/content/4577


	5. Thermal Properties and Combustion Modeling of Dimethyl Ether
	Longbao Zhou
	Dynamic and Electronic Engineering 21 December 2005
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	Abstract:Based on dimethyl ether(DME) engine experiments, a turbulent combustion model was developed to study the combustion characteristics of DME engine. It consisted of two sections. First, the correlation of DME thermal properties to temperature are required for numerical simulation of DME spray and combustion process, but cannot be obtained instantly through measurement. So molecule theory was applied here to estimate the correlation of the DME thermal properties to temperature, including latent enthalpy, surface tension, thermal conductivity and diffusion coefficient. And other DME thermal properties measured by experiments, including vapor pressure and viscosity coefficient, are also collected here. Then the combustion model was developed. The model took into account the influence of turbulence on combustion by coherent flamelet model(CFM) in addition to the original chemical kinetic model, so closer to the experiments and can be applied to the qualitative analysis of DME engine combustion. Numerical simulation indicated that, in engine condition DME spray has short tip penetration than diesel oil, with almost no wall impingement occurring. The upper edge of spray near the nozzle ignite first for the appropriate fuel concentration and higher temperature. In diffusion combustion the combustion is slow and lasts long for the slow air-fuel mixture formation. The results of numerical simulation are in good agreement with experiments.
	TO cite this article:Longbao Zhou. Thermal Properties and Combustion Modeling of Dimethyl Ether[OL].[21 December 2005] http://en.paper.edu.cn/en_releasepaper/content/4519


	6. Experimental studies of heat transfer enhancement
	Ye Xiang,Huang Suyi,Li Zhongzhou
	Dynamic and Electronic Engineering 13 October 2005
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	Abstract:With the rapid development of nanometer technology, researchers have gradually applied the new and advanced technology to the traditional area of Energy & Power. A new method of enhancing heat transfer of the heating section of a two—phase closed thermosiphon has been proposed .And, theoretical and experimental studies have been carried out of the performance of the heat transfer enhancement by adding a proper amount of nanoparticles to the thermosiphon with water as the working fluid. Compared with the ordinary thermosiphon, results indicate that this heat pipes posses such advantages as good startup, lower tube wall temperature, and its heat transfer coefficient is increased by 47～96%, heat flux is increased by 7.6～15% in the range of the experiment. The performance of the heat transfer relates to the diameter and the volume fraction of nanoparticle. This new enhancing method is simple and easy to apply in industry.
	TO cite this article:Ye Xiang,Huang Suyi,Li Zhongzhou. Experimental studies of heat transfer enhancement[OL].[13 October 2005] http://en.paper.edu.cn/en_releasepaper/content/3237

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