基于纳米粒子的水基纳米流体太阳能集水器的建模

R. Nasrin, M. A. Alim
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引用次数: 10

摘要

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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Modeling of a Solar Water Collector with Water‐Based Nanofluid Using Nanoparticles
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
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