On the Enhancement of Heat Transfer and Reduction of Entropy Generation by Asymmetric Slip in Pressure-Driven Non-Newtonian Microflows
On the Enhancement of Heat Transfer and Reduction of Entropy Generation by Asymmetric Slip in Pressure-Driven Non-Newtonian Microflows
复制标题
压力驱动非牛顿微流中非对称滑移强化传热和降低熵产生
DOI:
10.1115/1.4042157
复制
发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Christov, Ivan C.
中科院分区:
文献类型:
--
作者:
Anand, Vishal;Christov, Ivan C.
We study hydrodynamics, heat transfer, and entropy generation in pressure-driven microchannel flow of a power-law fluid. Specifically, we address the effect of asymmetry in the slip boundary condition at the channel walls. Constant, uniform but unequal heat fluxes are imposed at the walls in this thermally developed flow. The effect of asymmetric slip on the velocity profile, on the wall shear stress, on the temperature distribution, on the Bejan number profiles, and on the average entropy generation and the Nusselt number are established through the numerical evaluation of exact analytical expressions derived. Specifically, due to asymmetric slip, the fluid momentum flux and thermal energy flux are enhanced along the wall with larger slip, which, in turn, shifts the location of the velocity's maximum to an off-center location closer to the said wall. Asymmetric slip is also shown to redistribute the peaks and plateaus of the Bejan number profile across the microchannel, showing a sharp transition between entropy generation due to heat transfer and due to fluid flow at an off-center-line location. In the presence of asymmetric slip, the difference in the imposed heat fluxes leads to starkly different Bejan number profiles depending on which wall is hotter, and whether the fluid is shear-thinning or shear-thickening. Overall, slip is shown to promote uniformity in both the velocity field and the temperature field, thereby reducing irreversibility in this flow.
登录
查看更多内容
DOI:
--
发表时间:
2017
期刊:
影响因子:
--
作者:
H. Stone
通讯作者:
H. Stone
DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
Odgerel Jambal;T. Shigechi;Ganbat Davaa;S. Momoki
通讯作者:
S. Momoki
DOI:
--
发表时间:
1959
期刊:
影响因子:
--
作者:
R. Bird
通讯作者:
R. Bird
DOI:
--
发表时间:
2017
期刊:
影响因子:
--
作者:
Y. Asako;C. Hong
通讯作者:
C. Hong
DOI:
--
发表时间:
1989
期刊:
--
影响因子:
--
作者:
S. Paoletti;F. Rispoli;E. Sciubba
通讯作者:
S. Paoletti;F. Rispoli;E. Sciubba