查询词典 convection heat transfer

The effective heat-transfer temperature difference of every effect of multi-effect evaporation subsystem and the preheat temperature rise Δt_(p,j of every level of multi-level preheat subsystem of the design model were distributed by equal heating area, equal heat-transfer temperature difference, and free proration methods.

设计型模型对多效蒸发子系统各效有效传热温差Δt_i的分配和多级预热子系统各级预热温升Δt_的分配分别采用等面积法、等温差法、自由配比法等进行分配并采用矩阵法结合迭代法进行设计模拟计算，其中自由配比法巧妙地将具有复杂约束条件的决策变量Δt_i和Δt_转化为取值0～1的中间决策变量τ_i、τ_，为Δt_i和Δt_的自由搜索进而为优化设计提供了一个简便的方法；在常规设计模拟计算的基础上，建立了复杂多效蒸发系统优化设计模型，该模型以系统年总费用最小为优化目标，以生蒸汽温度T_0、冷凝器中二次蒸汽温度T_K、蒸发温差配比系数τ_i和预热温升配比系数τ_为决策变量，采用遗传算法结合矩阵法求解。

Take the opportunity of this project, theoretical and experimental researches on the high-efficiency evaporator used in a large quick-freeze equipment have been done. The main work of experimental research is as follows:(1) Compare and analyze the influences of structural parameters on the heat transfer coefficient of an evaporator. The calculation results show that, under non-freezing conditions, the structure possessing the highest heat transfer coefficient is the one with circular fins, equilateral-triangle arranged small tubes and varying fin-spacing.

主要做了以下几方面的试验研究工作：(1)对不同翅片形状、管径大小、翅片管排列方式，以及是否带波纹等结构参数对蒸发器传热系数的影响进行了比较分析，得出在不结霜工况下，具有最高传热系数的蒸发器结构是圆翅片小管径正三角形排列等节距结构的结论。

Through the analysis of the experimental and numerical calculation values, hereinafter gives the description of the characteristics of the flow and heat transfer within the rotating blade cavity. Influenced by the inflow structure and the centrifugal force, the air flow rate on the top of the blade is bigger than that at the bottom, therefore, there exists radial component velocity which may make the buoyancy force weaken the heat transfer behavior of the blade.

通过实验和数值计算的结果的分析，发现气流在旋转叶片腔内的一些流动和换热特征：在进口流动结构影响和离心力的作用下，使得叶片顶部的气流流量大于底部的流量，因此流体存在径向分速度，可能是这种径向分速度造成浮升力对叶片的换热起降低的作用。

Through the study of heat transfer between the cool and hot fluids in the recuperator, The expression describing the exergetic loss of their convective heat transfer is derived.

分析了热泵系统的主要部件、发生器和吸收器的传质过程，描述了其传质模型，传质分离效率以及它们与热力学不可逆性的关系。

Heat and work involve the transfer of energy; heat transfer red may become thermal energy.

热和功包含了能量的转移，热被转移可能变成热能。

Some sub-models of the original KIVA code were modified, by introducing into the Kelvin-Helmholtz and Rayleigh-Taylor model for spray breakup, the multiple laminar and turbulent characteristic timescale combustion model, the heat transfer model of Han and Reitz, the Hiroyasu and Nagle soot model and the improved Shell auto-ignition model were added to the original KIVA, to improve the predictions of engine spray, ignition, combustion, gas/wall heat transfer and emissions.

为提高模拟精度对标准的KIVA程序进行了改进，引入KH-RT雾化模型、层流和湍流多重特征时间尺度燃烧模型、Han和Reitz传热模型以及Hiroyasu和Nagle碳烟排放模型来模拟柴油机多次脉冲喷雾、燃烧、壁面传热及排放过程，同时增添改进的Shell自燃模型来模拟着火过程。

Based on the heat and moisture transfer theory, establishes the quasi three-dimensional and simplified model of heat and mass transfer between air, tailrace water and surface of tailrace tunnel using the lumped parameter model.

在水－空气热湿交换理论的基础上，采用集总参数法建立了无压尾水洞引风过程空气与尾水及洞壁面之间进行热湿交换的准三维数值模型及其简化模型。

According to flow patterns screened during common pressure experiment . The key factors that affect flow and heat transfer of the gas -liquid -liquid tempestuously mixed jet is analyzed ,the paper present a way and basic idea to describe the flow and heat transfer of the jet .

研究此时的传热现象主要采用实验研究的方法，文中根据常压实验拍摄到的流型，分析影响此气-液-液相互混合大脉动紊流的传热及流动的关键因素，提出描述此时传热和流动过程的基本概念和方法。

Experimental research on effects of a uniform electric field on plate pool boiling heat transfer enhancement was carried out. It's found that in the scope of lower overheat, boiling heat transfer is significantly enhanced under electric field.

对均匀高压电场作用下平板池沸腾换热的强化效果进行了试验研究，发现在较低过热度的范围内电场对换热有明显的强化效果。

Introducing the wet bulb specific heat capacity and the wet bulb heat transfer coefficient, a new mathematical model for the plate wet air cooler was developed based on the wet bulb temperature transfer characteristic.

分析结果表明壁面润湿率对冷却性能具有显著影响，而夹杂在空气中的液滴对传递过程的影响相对较小，工程计算可忽略夹杂液滴对传递模型的影响。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48