对流

Spiral-grooved tube ; intensification of heat exchange ; numerical simulation ; ANSYS ; convective heat exchange coefficient

螺旋槽管；强化换热；数值模拟； ANSYS ；对流换热系数

Results show that a combustion technique by increasing upper half counter offsetting auxiliary airs progressively and biasing superheater division panels can eliminate gas imbalance and heat deviation , decrease slagging on furnace and reduce NOx emission effectively.

某300MW 逆时针切向布置燃烧器锅炉在不同二次风反切方式下分隔屏向左偏置一定角度时，炉膛、烟道气流流动特性模型试验和数值模拟的研究结果表明：燃烧器上半部分二次风递增反切分隔屏偏置一定角度的燃烧技术能显著改善烟道偏流现象，可防止过大热偏差引起高温对流受热面超温、爆管，同时能降低炉内燃烧器区域结渣程度、减少NOx 生成，且改造方便、效果明显。

Having analysed the effects of side flow of chips and cutting edge interference on angle of chip flow ,a calculation equation, which is practical in a certain range,is bac up through experimentS and begion analysis.

在分析切屑横向流动及切削刃干涉对流屑角影响规律的基础上，通过试验并利用回归分析的方法，建立了在一定范围内实用的流屑角计算公式。

Air gap due to incomplete closure in the state, slow convection can reduce the heat inside the pot and set the energy loss of working hours.

因空气隙处于不完全封闭状态，对流缓慢，可减少发热盘和内锅工作时的能量散失。

The results show that the local heat transfer characteristics vary with k,and the separation of the boundary layer shifts downstream with the increase of k.

结果表明，局部对流换热系数随长径比k变化，边界层的分离点随k的增大而向后移动。

To deal with the deficiency of the self-learn method of heat transfer coefficient during plate laminar cooling process,a BP neural network was put forward to improve the self adapting system.

针对中厚板在轧后层流冷却过程中采用传统自学习方法修正计算对流换热系数存在的不足，提出利用BP神经网络对自适应系统进行改进。

Three-phase embed electrode salt bath furnace use the salt class as heating impregnant, according to the different operating temperature, could select different ingredient salt or compound salt, the salt is not electric beforemelting, therefore the salt bath furnace must use the starting-electrode to melt when using, because the electricity bring quantity of heat unceasingly through electric dissolving salt, so can maintain the dissolving state, because of electrode under the electromagnetic effect,make the dissolving saltcycle unceasingly through natural convection and magnetism mix round,therefore can well-proportioned heat workpiece rapidly.

三项埋入式电极盐浴炉采用盐类作加热剂，根据不同的工作温度，可选用不同成份的盐或混合盐，盐在熔化前是不导电的，因此盐浴炉使用时必须使用起动电极溶化，由于电流通过导电的溶盐不断产生热量，故可保持溶化状态，因电极在电磁力的作用下，通过自然对流和电磁搅拌而使熔盐不断循环，故可迅速和均匀的加热工件。

NEXT, the effects of trailing edge noise directivity and convective amplification2 (including the Doppler frequency shift) are applied to these radial source strengths , to obtain the effective noise source distribution in the rotor plane ,as perceived by an observer position was taken to be the position.

其次， 后缘噪声方向律的作用和对流amplification2 向这些辐形来源力量被运用，获得有效的噪声源发行在电动子飞机，as 由职位被接受是位置的观察员察觉。

The convection-dispersion equation with the retardation coefficient yield by method has been adopted to model NH4--N transport in saturated soil, simulation results are compared well with experimental results.

基于批平衡得到NH_4~+—N的吸附延迟系数，利用对流一弥散方程模拟NH_4~+—N在饱和土壤中的迁移过程，模拟结果与试验结果吻合较好。

This article mainly carries on the analysis with new weather radar data characteristic in this rainfall process. With the analysis of the reflection factor, the wind profile and the rainfall estimation, we know that the strong wind vertical change and sufficient water vapor condition have the extremely vital role to the development and the maintenance of the convection storm; The new weather radar has the very good instruction function to the weather forecast, specially at the rainfall estimated and in the catastrophe weather forecast and the short-time forecast.

本文主要对这次降水过程中的新一代天气雷达资料特征进行分析，通过对反射率因子、风廓线和降水估测等主要产品的分析，表明较强的风的垂直切变、充足的水汽条件对对流风暴的发展和维持有非常重要的作用；新一代天气雷达对气象预报工作有很好的指导作用，特别在降水估计、灾害性天气预报和短时临近预报中有非常重要的意义。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。