Heat Transfer-Asian Research最新文献

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Flow and Heat Transfer of Maxwell Fluid Over an Exponentially Stretching Sheet: A Non‐similar Solution 麦克斯韦流体在指数拉伸薄片上的流动和传热:一个非相似的解决方案

IF 4.9

Heat Transfer-Asian Research

Pub Date : 2014-05-01 DOI: 10.1002/htj.21074

Z. Abbas, T. Javed, N. Ali, M. Sajid

In this investigation, the boundary layer flow and heat transfer analysis in a Maxwell fluid over an exponentially continuous moving sheet are studied. The transformed boundary layer equations are solved numerically for a non‐similar solution using a shooting method with the Runge–Kutta algorithm. The purpose of this article is to look into the influence of the Deborah number on the velocity, temperature, and Nusselt number. The obtained results show that an increase in the Deborah number decreases the fluid velocity and boundary layer thickness. On the other hand, it increases the temperature and thermal boundary layer thickness. It is also found that the numerical results are in excellent agreement with the previous existing results for the case of a Newtonian fluid (λ = 0). © 2013 Wiley Periodicals, Inc. Heat Trans Asian Res, 43(3): 233–242, 2014; Published online 30 August 2013 in Wiley Online Library (wileyonlinelibrary.com/journal/htj). DOI 10.1002/htj.21074

本文研究了麦克斯韦流体在指数连续运动薄片上的边界层流动和传热分析。用龙格-库塔算法对变换后的边界层方程进行了非相似解的数值求解。本文的目的是研究底波拉数对速度、温度和努塞尔数的影响。结果表明，随着波底拉数的增加，流体速度和边界层厚度减小。另一方面，它增加了温度和热边界层厚度。在牛顿流体(λ = 0)的情况下，数值结果与先前的结果非常吻合。©2013 Wiley期刊公司。热力学报，43(3):233-242,2014;2013年8月30日在线发表于Wiley在线图书馆(wileyonlinelibrary.com/journal/htj)。DOI 10.1002 / htj.21074

引用次数: 14

The Interfacial Layer and the Thermal Conductivity of Nanofluid 纳米流体的界面层与导热性

IF 4.9

Heat Transfer-Asian Research

Pub Date : 2014-05-01 DOI: 10.1002/htj.21084

R. Pasrija, S. Srivastava

Nanofluids are a class of colloidal dispersion of nanosized particles which are found to exhibit anomalous heat conducting properties compared to other conventional heat transfer fluids. Among various factors responsible for this anomaly, the role of nanolayer thickness is found to be quite important. This article includes its effect by suggesting a new exponential form for the profile of thermal conductivity in the interfacial layer. The effect of nanoparticle size, the volume fraction, and the ratio of thermal conductivity of the nanoparticle to the base fluid form part of the discussion. The presented scheme predicts well the enhancement of thermal conductivity of two nanofluids, alumina/EG and CuO/water, used as an example. © 2013 Wiley Periodicals, Inc. Heat Trans Asian Res, 43(3): 288–296, 2014; Published online 3 October 2013 in Wiley Online Library (wileyonlinelibrary.com/journal/htj). DOI 10.1002/htj.21084

纳米流体是一类纳米颗粒的胶体分散体，与其他传统的传热流体相比，纳米流体表现出异常的导热性能。在造成这种异常的各种因素中，纳米层厚度的作用是相当重要的。本文通过提出界面层导热系数曲线的一种新的指数形式来阐述其影响。纳米颗粒大小、体积分数和纳米颗粒与基液的导热率的影响构成了讨论的一部分。以氧化铝/EG和氧化铜/水两种纳米流体为例，该方案较好地预测了两种纳米流体导热性的增强。©2013 Wiley期刊公司热力学报，43(3):288-296,2014;2013年10月3日在线发表于Wiley在线图书馆(wileyonlinelibrary.com/journal/htj)。DOI 10.1002 / htj.21084

引用次数: 12

MHD Flow and Heat Transfer of a Dusty Fluid Over a Stretching Hollow Cylinder with a Convective Boundary Condition 含尘流体在具有对流边界条件的拉伸空心圆筒上的MHD流动和换热

IF 4.9

Heat Transfer-Asian Research

Pub Date : 2014-05-01 DOI: 10.1002/htj.21073

A. Rasekh, D. Ganji, S. Tavakoli, H. Ehsani, S. Naeejee

In this study, we deal with the problem of a steady two‐dimensional magnetohydrodynamic (MHD) flow of a dusty fluid over a stretching hollow cylinder. Unlike the commonly employed thermal conditions of constant temperature or constant heat flux, the present study uses a convective heating boundary condition. The multi‐step differential transform method (multi‐step DTM), one of the most effective methods, is employed to find an approximate solution of the system of highly nonlinear differential equations governing the problem. Comparisons are made between the results of the proposed method and the numerical method in solving this problem and excellent agreement has been observed. The influence of important parameters on the flow field and heat transfer characteristics are presented and discussed in detail. The results show that both the thermal boundary layer thickness and the heat transfer rate at the wall increases with increasing Biot number Bi, while it has no effect on the skin friction coefficient. © 2013 Wiley Periodicals, Inc. Heat Trans Asian Res, 43(3): 221–232, 2014; Published online 30 August 2013 in Wiley Online Library (wileyonlinelibrary.com/journal/htj). DOI 10.1002/htj.21073

在本研究中，我们处理了含尘流体在拉伸中空圆柱体上的稳定二维磁流体动力学(MHD)流动问题。与通常采用的恒温或恒热流密度热条件不同，本研究采用对流加热边界条件。多阶微分变换(multi - step differential transform，简称multi - step DTM)是最有效的方法之一，用于求解控制该问题的高度非线性微分方程组的近似解。将所提出的方法与数值方法的结果进行了比较，结果非常吻合。详细讨论了重要参数对流场和换热特性的影响。结果表明:随着Biot数Bi的增加，热边界层厚度和壁面换热率均增加，但对壁面摩擦系数没有影响;©2013 Wiley期刊公司热力学报，43(3):221-232,2014;2013年8月30日在线发表于Wiley在线图书馆(wileyonlinelibrary.com/journal/htj)。DOI 10.1002 / htj.21073

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引用次数: 9

Unsteady Mixed Convection Flow of a Rotating Second‐Grade Fluid on a Rotating Cone 二级流体在旋转锥上的非定常混合对流流动

IF 4.9

Heat Transfer-Asian Research

Pub Date : 2014-05-01 DOI: 10.1002/htj.21072

S Nadeem, S. Saleem

In the present article, we have investigated the unsteady mixed convection flow of a rotating second‐grade fluid in a rotating cone with time‐dependent angular velocities. Two cases of heat transfer are presented which are known as (i) prescribed wall temperature (PWT) and (ii) prescribed heat flux (PHF). The governing coupled nonlinear partial differential equations are simplified with the help of transformations and non‐dimensional similar and non‐similar variables, and solved analytically with the help of the homotopy analysis method (HAM). The effects of pertinent parameters on the velocity, temperature, concentration, skin friction coefficients, Nusselt number, and Sherwood number have been examined through graphs. © 2013 Wiley Periodicals, Inc. Heat Trans Asian Res, 43(3): 204–220, 2014; Published online 30 August 2013 in Wiley Online Library (wileyonlinelibrary.com/journal/htj). DOI 10.1002/htj.21072

本文研究了二阶流体在角速度随时间变化的旋转锥内的非定常混合对流流动。提出了两种传热情况，即(i)规定的壁温(PWT)和(ii)规定的热流密度(PHF)。利用变换和无量纲相似和非相似变量对控制耦合非线性偏微分方程进行了简化，并利用同伦分析方法进行了解析求解。通过图形考察了相关参数对速度、温度、浓度、表面摩擦系数、努塞尔数和舍伍德数的影响。©2013 Wiley期刊公司热力学报，43(3):204-220,2014;2013年8月30日在线发表于Wiley在线图书馆(wileyonlinelibrary.com/journal/htj)。DOI 10.1002 / htj.21072

引用次数: 6

Solution of nonlinear boundary layer equation for flat plate via optimal homotopy asymptotic method 平板非线性边界层方程的最优同伦渐近解

IF 4.9

Heat Transfer-Asian Research

Pub Date : 2014-05-01 DOI: 10.1002/htj.21070

F. Mabood, W. Khan, A. I. Ismail

In this article, we use the optimal homotopy asymptotic method (OHAM) to compute the solution of two‐dimensional incompressible laminar boundary layer flow over a flat plate (Blasius problem). The obtained results for the stream function and velocity profile were comparable in terms of accuracy with that obtained by Esmaeilpour and Ganji (2007) who studied the same problem using the homotopy perturbation method and results obtained by using a numerical method (RK4). The good agreement obtained shows the effectiveness of OHAM. © 2013 Wiley Periodicals, Inc. Heat Trans Asian Res, 43(3): 197–203, 2014; Published online 19 June 2013 in Wiley Online Library (wileyonlinelibrary.com/journal/htj). DOI 10.1002/htj.21070

本文利用最优同伦渐近方法(OHAM)计算了平面上二维不可压缩层流边界层流动(Blasius问题)的解。得到的流函数和速度剖面的结果与esmailpour和Ganji(2007)使用同伦摄动方法和数值方法(RK4)研究相同问题的结果在精度上相当。所获得的良好一致性表明了OHAM的有效性。©2013 Wiley期刊公司热力学报，43(3):197-203,2014;2013年6月19日在线发表于Wiley在线图书馆(wileyonlinelibrary.com/journal/htj)。DOI 10.1002 / htj.21070

引用次数: 8

Modeling of a Solar Water Collector with Water‐Based Nanofluid Using Nanoparticles 基于纳米粒子的水基纳米流体太阳能集水器的建模

IF 4.9

Heat Transfer-Asian Research

Pub Date : 2014-05-01 DOI: 10.1002/htj.21080

R. Nasrin, M. A. Alim

The pressure‐velocity form of the Navier–Stokes equations, energy equation, and concentration equation are used to represent the mass, momentum, energy, and concentration conservations of the nanofluid medium in the solar collector. The governing equations and corresponding boundary conditions are converted to dimensionless form and solved numerically by the finite element method. The physical domain is discretized by triangular mesh elements with six nodes. The working fluid is water‐based nanofluid with two nanoparticles, namely, silver (Ag) and copper oxide (CuO). The study includes computations for different values of buoyancy ratio (Nr) and Schmidt number (Sc). Flow, heat, and mass transfer characteristics are presented in the forms of streamlines, isotherms, and iso‐concentrations. In addition, results for the average radiative, convective heat and mass transfer, mean temperature and concentration of nanofluid, mid‐height horizontal‐vertical velocities, and subdomain average velocity field are offered and discussed for the above‐mentioned parametric conditions. Results show that the effects of Nr and Sc on the convective‐radiative heat and mass transfer phenomenon inside the collector are significant for all values of Nr and Sc studied. Comparison and validation with the standard experimental/numerical data is given in brief. The variation of the obtained result is presented as 34% with the result of experimental data. © 2013 Wiley Periodicals, Inc. Heat Trans Asian Res, 43(3): 270–287, 2014; Published online 30 September 2013 in Wiley Online Library (wileyonlinelibrary.com/journal/htj). DOI 10.1002/htj.21080

Navier-Stokes方程、能量方程和浓度方程的压力-速度形式被用来表示太阳能集热器中纳米流体介质的质量、动量、能量和浓度守恒。将控制方程和相应的边界条件转化为无因次形式，用有限元法进行数值求解。物理域采用六节点三角网格单元离散化。工作流体是水基纳米流体，具有两种纳米颗粒，即银(Ag)和氧化铜(CuO)。研究包括不同浮力比(Nr)和施密特数(Sc)值的计算。流动、热和传质特性以流线、等温线和等浓度的形式呈现。此外，给出了上述参数条件下的平均辐射、对流传热和传质、纳米流体的平均温度和浓度、中高水平垂直速度和子域平均速度场的计算结果，并进行了讨论。结果表明，Nr和Sc对集热器内对流辐射传热传质现象的影响是显著的。并与标准实验/数值数据进行了比较和验证。所得结果与实验数据的偏差为34%。©2013 Wiley期刊公司热力学报，43(3):270-287,2014;2013年9月30日在线发表于Wiley在线图书馆(wileyonlinelibrary.com/journal/htj)。DOI 10.1002 / htj.21080

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引用次数: 10

Modeling and CFD Simulation of a Mixed‐Convection Flow of Regular Fluids and Nanofluids in Vertical Porous and Regular Channels 垂直多孔和规则通道中规则流体和纳米流体混合对流流动的建模和CFD模拟

IF 4.9

Heat Transfer-Asian Research

Pub Date : 2014-05-01 DOI: 10.1002/htj.21079

A. Hashemi, A. Dehkordi

In this article, the problem of combined forced and free convection in vertical porous and regular channels for both regular fluids and nanofluids has been solved using the CFD technique in the entrance regions of momentum and heat transfer taking into account the influences of viscous heating and inertial force. In this regard, various types of viscous dissipation models reported in the literature such as the Darcy model, the power of the drag force model, and the clear fluid‐compatible model were applied. In the case of nanofluid flow, both the Brownian and thermophoresis molecular transfer mechanisms were considered. The dimensionless distributions of velocity, temperature, and the volume fraction of nanoparticles were determined in terms of corresponding dimensionless numbers such as the Grashof, Reynolds, Forchheimer, Brinkman, and Darcy numbers. The predicted results were validated using fully‐developed distributions of velocity and temperature. In addition, the influences of the Grashof number value on the temperature and velocity distributions in the entrance and fully‐developed regions were examined carefully. In addition, temperature and velocity distributions of nanofluids and regular fluids in porous and regular channels were compared. © 2013 Wiley Periodicals, Inc. Heat Trans Asian Res, 43(3): 243–269, 2014; Published online 30 September 2013 in Wiley Online Library (wileyonlinelibrary.com/journal/htj). DOI 10.1002/htj.21079

本文在考虑粘性加热和惯性力影响的情况下，利用CFD技术求解了垂直多孔和规则通道中规则流体和纳米流体的强制对流和自由对流联合问题。在这方面，应用了文献中报道的各种类型的粘性耗散模型，如达西模型、阻力功率模型和透明流体相容模型。在纳米流体流动的情况下，考虑了布朗和热泳分子传递机制。用相应的无因次数(如Grashof、Reynolds、Forchheimer、Brinkman和Darcy数)确定了纳米颗粒的速度、温度和体积分数的无因次分布。利用充分发展的速度和温度分布验证了预测结果。此外，还仔细研究了Grashof数值对入口和完全发育区域温度和速度分布的影响。此外，还比较了纳米流体和常规流体在多孔通道和规则通道中的温度和速度分布。©2013 Wiley期刊公司热力学报，43(3):243-269,2014;2013年9月30日在线发表于Wiley在线图书馆(wileyonlinelibrary.com/journal/htj)。DOI 10.1002 / htj.21079

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引用次数: 8

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