Effect of Local Thermal Non-equilibrium on the Onset of Convection in a Porous Medium Layer Saturated by a Nanofluid

被引：181
|
作者：
Kuznetsov, A. V. [1 ]
Nield, D. A. [2 ]
机构：
[1] N Carolina State Univ, Dept Mech & Aerosp Engn, Raleigh, NC 27695 USA
[2] Univ Auckland, Dept Engn Sci, Auckland 1142, New Zealand
来源：
TRANSPORT IN POROUS MEDIA | 2010年 / 83卷 / 02期
关键词：
Local thermal non-equilibrium; Nanofluid; Porous medium; Instability; Natural convection;
D O I：
10.1007/s11242-009-9452-8
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
The onset of convection in a horizontal layer of a porous medium saturated by a nanofluid is analytically studied. The model used for the nanofluid incorporates the effects of Brownian motion and thermophoresis. For the porous medium, the Darcy model is employed. The effect of local thermal non-equilibrium among the particle, fluid, and solid-matrix phases is investigated using a three-temperature model. The analysis reveals that in some circumstances the effect of LTNE can be significant, but for a typical dilute nanofluid (with large Lewis number and with small particle-to-fluid heat capacity ratio) the effect is small.
引用
收藏
页码：425 / 436
页数：12
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