传热

The thickness of the ice cover on the wall surface heat transfer is greater than the thickness of it on the air heat transfer form. The thickness of the ice cover on the wall surface heat transfer along the way changes slowly, but it on the air heat transfer along the way changes significantly. Reducing the entrance velocity, lowering the wall surface or air temperature, the formation of the thickness of the ice cover will increase; in the 3D circumstances, The thickness of the ice cover was relatively uniform in the import of the U-turn model, the ice cover was gradual accumulation in the convex bank when the stream traversed the import of the U-turn model, the thickness of the ice cover in the convex bank was significantly bigger than the thickness in the concave bank. The temperature field under the ice cover tends to be complex because of the existence of the secondary flows. The temperature in the convex bank is greater than it in the concave bank. Compared with the data from experiments, the laws in the numerical simulation are similar with them in the experiments

模拟结果显示：二维情况下，运用壁面传热形成的冰盖厚度大于运用空气传热形成的冰盖厚度，壁面传热形成的冰盖厚度沿程变化缓慢，而空气传热形成的冰盖厚度沿程变化明显，减小入口流速，降低壁面或空气温度等，形成冰盖的厚度都会增大；三维情况下，弯道入口处凸、凹岸形成的冰盖厚度基本相同，进入弯道后，凸岸形成的冰盖厚度逐渐增大，而凹岸的冰盖厚度逐渐减小，受横向环流的影响，冰盖下水流的温度场趋向复杂，并且凸岸的温度小于凹岸的温度；与实验室实验所得数据相比较，数值模拟研究得到的规律基本符合实验规律。

This method is not necessary to solve a complex unlined partial differential equation so that the computational cost is reduced.

本文在温度场的模拟计算中，将铸件中同时发生的连续的传导传热和对流传热，用在微小时间间隔内独立的传导传热和对流传热近似表达，完成充型过程中流场与温度场的耦合计算。

The frondose techniques of heat transfer enhancement were comparatively amply introduced,and the relevant new structures to enhance heat transfer were enumerated.

比较全面地介绍了换热器的强化传热技术及其应用，列举了相应的强化传热新结构；点明了强化传热技术的选用，以期对今后的强化传热研究工作提供帮助。

In order to investigate the basic heat transfer characteristics of the platelet regeneratively cooled thrust chamber, the second chapter focussed on the developed flow and heat transfer in the long straight regenerative cooling channels with rectangular sections.

为了解层板再生冷却推力室在传热上的基本特征，第二章重点研究流动和热充分发展的矩形截面长、直再生冷却通道内的传热问题，建立了层板再生冷却推力室二维流固耦合传热过程的数理模型，采用通用形式控制方程描述冷却剂紊流传热和通道材料内导热的共轭传热问题，从而避免了流-固区域之间的反复迭代，大大缩短了计算时间。

Thermal delivery out of the drills is a very complicated process, according to the difference of working condition, thermal delivery has steady state and non-steady state, considering that the subterrene is a bit, and is removing constantly, non-steady state should be taken as the main pattern.

热能在热熔器外的传递是一个非常复杂的过程，依据工况的不同有非稳态传热，也有稳态传热，但考虑到热熔器实际上是一个钻头，它要不断移动，所以非稳态传热应视为实际上的主要传热。

Four processes in gas-burning vacuum hot water boiler are researched in the paper:gas combustion process, heat transfer from gas to water, water boiling heat transfer, heat transfer of the process of congealing from steam to water by heat exchanger.

研究的燃气真空热水锅炉包括四个同时进行的过程燃料的燃烧过程，烟气向水的传热过程，水的沸腾传热过程，蒸汽与水通过换热器的凝结传热过程，在这个循环过程中，通过对其传热机理的分析研究，进行了真空锅炉内部结构的热工计算。

The major works are as follows: 1 The 3-D numerical model of U-sharp flow passages is set up. The single-phase fluid flow and heat transfer are simulated for the U-sharp smooth and rib-roughened flow passages with FLUENT software. Their performance curves, temperature field and velocity vector are obtained and the local heat transfer and flow pressure-drop distribution along flow passage are analyzed. It is revealed that the ribbed flow passages can enhance heat-transfer and make the temperature more uniform, but it increases the pressure-drop to more extent. 2 The influences of diaphragm depth, channel width and board spacing on the performance are investigated.

建立了层叠式蒸发器U形流道的3维湍流模型，用FLUENT软件对尺寸相同的U形光滑流道和肋化流道中单相流体的传热和流动进行了数值模拟，得到了两种流道的传热和阻力性能关系曲线及速度矢量图、温度场，分析了光滑流道和肋化流道的局部换热系数及沿程压降变化，结果表明流道的肋化能有效的增强传热，而且使流体的流动和传热更加均匀，但也较大地增大了阻力。

Heat transfer will worsen if structure parameters of the spring inserts are not fit. The paper think that the mechanism of heat transfer enhances of the spring inserts is the laminar flow lining is thinner because of librating of the spring inserts, accordingly the part of convection is enhanced. But the part of boil is not influenced.

通过弹簧插入物的各个参数对传热性能的影响分析，认为弹簧插入物对竖管降膜蒸发传热强化的机理主要是弹簧的振动加强了液膜的湍动，减薄了层流内层，从而强化了对流传热分量，但对沸腾传热分量没有影响。

This article mainly is analyzed the empirical datum of the Heat Transfer in the High Gravity Rotary Device of Countercurrent Flow, and discussed the heat transfer influence, example for intake and outtake temperature of cold and thermal fluid, current capacity, rotational speed and so on.

本文对逆流超重机的传热进行了研究，通过查阅大量关于超重力技术和直接接触传热的资料，综合分析出超重力场下的传热属于冷热流体直接接触的对流传热。流体在高速旋转中产生的强大离心力即超重力，使气液的流速及填料得比表面积大大的提高而不液泛。

Wan Zhongmin ,Liu Wei, Zhang Liang, Ming Tingzhen （College of Energy and Power Engineering, H uazhong University of Science and Technology, Wuhan 430074）The operational behavior of small-scale flat-plate type capillary pumped loop at high heat fluxes was analyzed. The total pressure loss along the loop and maximum capillary pressure of the evaporator wick for different working fluids were obtained.

引言毛细抽吸两相流体回路是一种利用液体工质的相变进行传热传质的两相热控系统，具有结构简单，安置灵活，传热效率高，不需外加动力装置，运行可靠，传热温差小，热传输距离长以及传热能力强等优点，使其成为航空航天热控技术的有效方式[1 ]。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。