自然对流换热,natural convection heat transfer
1)natural convection heat transfer自然对流换热
1.Influences of permanent gradient magnetic field configurations on airnatural convection heat transfer;永磁梯度磁场布置方式对空气自然对流换热的影响
2.Testing ofnatural convection heat transfer performance of electric heaters under lower air pressure;低气压条件下电加热器自然对流换热性能测试
3.Numerical simulation of indoornatural convection heat transfer;室内空气自然对流换热的数值模拟研究
英文短句/例句
1.Natural convection heat transfer in the air-layer of insulating glass中空玻璃空气夹层内的自然对流换热
2.Study of Natural Convection of Closed triangle channel heat pipe封闭三角形通道内热管的自然对流换热研究
3.HEAT TRANSFER OF NATURAL CONVECTIVE FLOW BETWEEN AIR AND INCLINED PLATE WITH HEATED SURFACE UPWARD倾斜平板热面朝上自然对流换热实验研究
4.Influence of different medium parameters on natural convection in a square enclosure filled porous medium介质参数对多孔介质腔内自然对流换热的影响
5.Numerical simulation of natural convection and heat transfer of nanofluids in a two-dimensional enclosure封闭腔内纳米流体强化自然对流换热的数值模拟
6.The Experimental Study of Natural Convection Heat Transfer in Rectangular Enclosure at Arbitary Inclined Angles任意倾斜角度下平行平板封闭夹层自然对流换热实验研究
7.Study on Natural Convection Heat Transfer Performance and Structure Optimum of Longitudinal Finned Tube in Vertical;竖直纵向翅片管自然对流换热特性研究及结构优化
8.Fourth-Order Compact Difference for Solving Navier-Stokes Equations and Numerical Simulation of Natural Convection Heat Transfer;Navier—Stokes方程组的四阶紧致差分方法与自然对流换热问题的数值模拟
9.Experiment on Heat Transfer of Natural Convection in Vertical Narrow Rectangular Channels竖直矩形窄通道空气自然对流换热特性的实验研究
10.Numerical Simulation Prediction of Heat Transfer of Natural Convection from Open-ended Inclined Channels Formed by an Array of Slats of Shutter;百叶窗式叶片形成的端部开口倾斜通道自然对流换热的数值模拟预测
11.The Study on Natural Convective Subcooled Boiling Heat Transfer in Vertical Narrow Annulars;竖直窄环隙流道自然对流过冷沸腾换热研究
12.The Experimental Study on Enhancing the Heat Transfer of Natural Convection and Boiling Outside of the Tube;管外自然对流及沸腾强化换热实验研究
13.Convective heat transfer characteristics of impingement cooling for a self-excited precessing jet自激励旋进射流冲击冷却的对流换热特性
14.Instabilities of boundary layers along a tilt plate dissipating uniform heat flux恒热流斜板自然对流边界层的稳定性研究
15.Effect of horizontal conductive solid wall on natural convection in a porous triangular cavity导热壁面对三角形多孔腔体内自然对流的影响
16.Numerical Analysis of Combined Heat and Mass Transfer by Natural Convection on Inclined Plates;倾斜平面上传热传质复合自然对流的数值研究
17.Numerical Simulation of Natural Convection from Seperated Elements and Wire-On-Tube Condenser;离散型热体及钢丝冷凝器自然对流的数值模拟
18.SIMULATION OF NATURAL CONVECTION FLOW BY THE THERMAL LATTICE BOLTZMANN METHOD基于热格子Boltzmann方法的自然对流数值模拟
相关短句/例句
natural convection自然对流换热
1.This article has discussed and analyzed the research status ofnatural convection in a closed square cavity;moreover,has studied the method of numerical simulation and the feasibility of studying the heat transfer by using FLUENT software.论述和分析了封闭方腔自然对流换热的研究进展,研究了采用商业软件FLUENT对此模拟的方法以及换热规律研究的可行性,所获得的数值模拟结果与研究文献做了对比分析,其模拟结果是正确的,由此表明:采用FLUENT软件通过数值模拟方法不仅能获得封闭腔自然对流换热的结果,还能研究其换热规律,是解决封闭腔自然对流换热的有效工具。
2.In this paper, thenatural convection in a cube inclined enclosure with three isolatedplates was investigated experimentally.本文研究了平板的相互位置、腔体倾角及Rα数对倾斜封闭立方腔内多块孤立平板自然对流换热的影响。
3.This article has discussed and analyzed the research status ofnatural convection in a closed cavity; a numerical simulation of two dimensional heat dissipation is made by the software of Fluent in closed triangle channel heat pipe and the wall; and then get the temperature and velocity field.论述和分析了封闭腔内自然对流换热的研究进展,运用Fluent软件对封闭三角形通道内的热管与壁面的二维散热问题进行了数值模拟,模拟了封闭腔内空气自然对流换热的温度场和速度场。
3)natural convective heat transfer自然对流换热
1.This paper numerically simulatednatural convective heat transfer of isothermal vertical strip by using the concept and equations set of tridimensional boundary layer.应用三维边界层的概念及方程组,数值模拟了等温竖窄条自然对流换热。
2.On the basis ofnatural convective heat transfer experimental research in annular air layer, by means of dimensional relation this paper analyzes and discusses the experimented data in order to more know the heat losses.本文在环形夹层自然对流换热实验研究的基础上,从有利于了解热损失的变化情况出发,采用有量纲的分析方法进行讨论,得出了在实验条件下q_c—L的交化规律,并给出了相应于最小热损失的最佳间距。
4)natural convection and heat transfer in an enclosure腔内自然对流换热
1.A time-dependent primitive variables numerical method for solving thenatural convection and heat transfer in an enclosure;原始变量时间推进法计算封闭腔内自然对流换热
5)convection coefficient of heat transfer自然对流换热系数
1.In this paper, the math model of energy storage system with solid liquid phase change is simplified by introducing naturalconvection coefficient of heat transfer α.引入自然对流换热系数 ,将固液蓄能数学模型简化为仅用能量方程加以描述。
6)extractive natural convective heat transfer抽吸式自然对流换热
延伸阅读
自然对流换热自然对流换热natural convection heat transfer间内的自然对流换热,其流体流动的状态亦即换热的强弱都可用无t纲数~些红工专塑尘和~含的乘积来表示.这里,‘为重力加速度,夕为流体的体胀系数,T,和T.为换热表面的和远离换热表面流体的温度,L为物体的定型尺寸(例如,对于竖壁和竖管为高度,对于横管为直径),,和。为T,一冬(T,一曰~’,~’‘’J书~R~~一’一”’一/J一2、一’+T.)温度下流体的运动猫度和热扩散率。‘:称为格拉晓夫数,是浮升力与钻滞力的比值,表示浮升力对流场的影响。当致Gr数较小时,沿换热表面的流动状态为层流,当Gr数增大到某个临界值时,层流变成不稳定并过渡为湍流.尸r数表示流体物性对换热过程的影响.所以常用Gr数和尸r数的乘积来综合表示流体运_.,L.‘一一_.,二_.L‘一一~了~、,口L)一_动的状态和物性对换热强度I用Nu三岑}表示,a为~”碑一梦、J即’‘,闪汕’J~n、‘一~\尹’j一’一一又)~礴”一/J换热系数,孟为流体的导热率,Nu称为努塞尔数)的影响。这种影响通常表述成下述指数函数形式,并称之为换热关系式Nuf=c(GrfPrf).它是在一定的(Grf尸r,)范围内,用实验数据综合出来的.:、n为实验常数,随流体运动的状态,流动空间和换热面的形状、尺寸以及位t、流体的物性参数,换热面与流体之间的温差等因素的不同而变化。对于大空间内的自然对流换热,一些典型情况下的‘、,值如表1所示。下角标f表示各物性参数是以Tf作为定性温度来确定其数值的。在封闭空间内,自然对流的情况除与流体性质、冷热表面温差有关外,还将受空间的形状与尺寸的影响,过程更为复杂。由于光测技术的发展和电子计算机的应用,自60年代以来封闭空间内的自然对流换热的研究取得了很大的进展.以矩形夹层为例,当厚度为古的夹层竖直放置时,由于流体沿热壁向上运动和沿冷壁向下运动的两股流动的边界互相作用,使整个夹层内形成若干环流,此时夹层的换热系数增大。而当Gra三些卫竺呀二卫<20oo时,可认为夹层内没有流动发生,通过夹层的热量可按纯导热过程计算。当夹层水平放置且热壁在下时,Gr,>1700以后夹层内形成有秩序的蜂窝状分布的环流,Gra)500。。时蜂窝状环流消失,变成湍流;当G介<1700时可按纯导热过程计算。对于夹层,换热系数可用公式q一a(Twl一TwZ)定义,式中T,l和T。2分别为热壁和冷壁的温度,K;q为热流通量。竖直、倾斜以及水平夹层的换热关系式列在表2中。裹1几种典型的物体与流体间的自然对流换热关系式中的c和月值┌─────────────┬───────────────┬───────┬───┬──┬───────────────────────────┐│换热物体形状 │定型尺寸L │GrfPrf│C │九 │备注 │├─────────────┼───────────────┼───────┼───┼──┼───────────────────────────┤│竖板和竖图管(图柱)│板或圆管的高度│104~109│0 .59 │l/4 │层流国柱应满足D/L)下粤二 ││ │ │109一1012 │0。10 │1/3 │ 妙r乙‘万, ││ │ │ │ ││ 湍流│├─────────────┼───────────────┼───────┼───┼──┼───────────────────────────┤│水平回柱(圆管)│回柱直径 │104~109│0。53 │1/4 │层流 ││ │ │10,~1012 │0 .13 │l/3 │湍流 │├─────────────┼───────────────┼───────┼───┼──┼───────────────────────────┤│水平平板热面朝上或冷面朝下│,_平板表面积 │ZX10弓~8X106 │0 .54 │1/4 │层流 ││水平平板热面朝下或冷面朝上│J曰一-,不尸下:丁气二犷-六,- │ 8火106~1011 │0 .15 │1/3 │湍流 ││ │ 带很周太│105~1011 │0.58 │1/5 │层流 │└─────────────┴───────────────┴───────┴───┴──┴───────────────────────────┘裹2矩形夹层几种典型状态的换热关系式┌───────────────┬───────────────────┬──────────────┐│夹层位!│换热关系式│适用范图│├───────────────┼───────────────────┼──────────────┤│热壁在下的水平夹层(气体) │Nua=0.059(GraPr)o·4 │1700