对多孔材料强化管内换热进行了数值研究,详细讨论了多孔材料厚度(0≤e≤1)和渗透率(10-5≤Da≤10)等参数对管内换热特性和压力损失的影响.结果表明:利用多孔材料调整流场分布,剪薄边界层厚度,能够有效地增强管内换热.当Da=10-4时,管内充分发展Nu数最大能够增至空管时5.5倍左右.但管内压力损失随着多孔材料厚度e的增加或Da数的减小而急剧增大.因此在实际应用中,应采用部分填充多孔材料,文中建议最佳的多孔材料厚度e取O.6左右,此时换热可以得到相当程度的强化,而且压力损失控制在可接受的范围内.
参考文献
[1] | A. A. Mohamad .Heat transfer enhancements in heat exchangers fitted with porous media Part I: constant wall temperature[J].International Journal of Thermal Sciences,2003(4):385-395. |
[2] | J M Zhang;W H Sutton;F C Lal .Enhancement of Heat Transfer Using Porous Convection-to-Radiation Converter for Laminar Flow in a Circular Duct[J].International Journal of Heat and Mass Transfer,1996,40(01):39-48. |
[3] | M. K. Alkam;M. A. Al-Nimr;M. O. Hamdan .Enhancing heat tranfer in parallel-plate channels by using porous inserts[J].International Journal of Heat and Mass Transfer,2001(5):931-938. |
[4] | Ould-Amer Y.;Bouhadef K.;Lauriat C.;Chikh S. .Forced convection cooling enhancement by use of porous materials[J].International journal of heat and fluid flow,1998(3):251-258. |
[5] | H J Sung;S Y Kim;J M Hyun .Forced Convection from an Isolated Heat Source in a Channel with Porous Medium[J].International Journal of Heat and Fluid Flow,1995,16(06):527-535. |
[6] | Li ZY.;Tao WQ. .A new stability-guaranteed second-order difference scheme[J].Numerical Heat Transfer, Part B. Fundamentals: An International Journal of Computation and Methodology,2002(4):349-365. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%