Soret效应和Dufour效应对盐梯度太阳池热盐双扩散的影响研究
IMPACT STUDY OF SORET EFFECT AND DUFOUR EFFECT ON DOUBLE DIFFUSION IN SALT GRADIERT SOLAR POND
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摘要: 该文建立盐梯度太阳池数学及物理模型,考虑Soret效应和Dufour效应对热盐双扩散的作用,采用格子Boltzmann方法,以C++为平台分别对速度场、温度场和浓度场进行描述。选取不同的Soret数和Dufour数,得到速度、温度和浓度的微观变化情况,讨论Soret效应和Dufour效应对盐梯度太阳池热盐双扩散的影响。结果表明:Soret效应对传热和传质均具有促进作用;Dufour效应对传热具有一定的抑制作用,对传质具有促进作用,Soret效应比Dufour效应对盐梯度太阳池热盐双扩散的影响作用更强烈。Abstract: A mathematical and physical model of the salt gradient solar pond is established considering the influences of Soret effect and Dufour effect on the double diffusion. The velocity field,temperature field and concentration field are described by lattice Boltzmann method on the platform of C + +. The micro-variations of velocity,temperature and concentration are obtained by choosing different Soret numbers and Dufour numbers. The influence of Soret effect and Dufour effect on the double diffusion in salt gradient solar pond are discussed. The results show that Soret effect promotes both heat and mass transfer,Dufour effect inhibits heat transfer but promotes mass transfer,and Soret effect has a stronger effect on double diffusion in salt gradient solar pond than Dufour effect.
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