Numerical simulation of fluid flow and heat transfer characteristics in a saw-like microchannel

doi:10.16085/j.issn.1000-6613.2022-2321

Abstract

Abstract:

In this study, a saw-like microchannel was proposed to enhance convective heat transfer. The fluid flow and heat transfer characteristics of this proposed microchannel were numerically investigated using COMSOL software. The effect of saw-like microchannel on fluid flow and heat transfer performance were studied in both forward and backward direction. The Reynolds number (Re) ranged from 50 to 700. The numerical results indicated that the present microchannel configuration greatly strengthened the spatial mixing of fluid and significantly disturbs the thermal boundary layer, leading to dramatic enhancement of convective heat transfer. Compared to conventional microchannel, Nusselt number (Nu) was significantly enhanced by 102.7%. Additionally, fluid flow and heat transfer characteristics of this saw-like microchannel in both forward and backward directions were investigated. At Re=700, the Nu in the backward direction was increased by 20% compared to that in forward direction. However, the pressure drop was magnified about 110%.

Key words: saw-like microchannel, enhancement of conjugate heat transfer, fluid mixing, Nusselt number

摘要：

设计了一种锯齿型微通道强化对流传热，利用COMSOL软件对该微通道的流动与传热特性进行了数值模拟，研究了正反流动方向上锯齿型结构对通道内流动和传热的影响，其中雷诺数为50~700。数值结果表明，锯齿型微通道极大地强化了流体在空间上的混合以及对热边界层产生了明显扰动，显著提升了微通道内的对流传热。相对常规矩形微通道，努塞尔数（Nu）提高了102.7%。另外，研究了不同流动方向下锯齿型微通道的流动与传热特性。在雷诺数Re=700时，反向流动的Nu相比正向流动增加了20%，但压降同时增加了110%。

关键词: 锯齿型微通道, 共轭传热强化, 流体混合, 努塞尔数

CLC Number:

LIU Zhaoxuan, ZHANG Chengbin, HAN Qun, JIANG Haitao, LI Wenming. Numerical simulation of fluid flow and heat transfer characteristics in a saw-like microchannel[J]. Chemical Industry and Engineering Progress, 2023, 42(11): 5622-5636.

刘兆轩, 张程宾, 韩群, 姜海涛, 李文明. 锯齿型微通道流动与传热特性数值模拟[J]. 化工进展, 2023, 42(11): 5622-5636.

Figures/Tables 21

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参数	物理意义	尺寸/mm
L	总长度	16.00
W	总宽度	0.6400
H	总高度	0.5000
L_m	单个锯齿长度	0.4000
W_m	锯齿最大宽度	0.5400
W_fs	正向流动入口壁厚	0.0875
W_rs	反向流动入口壁厚	0.2800
W_f_l	正向流动入口宽度	0.4650
W_r_l	反向流动入口宽度	0.0800
H_b	底部厚度	0.2000
H_m	微通道高度	0.3000
d	喉道处宽度	0.0800

参数	物理意义	尺寸/mm
L	总长度	16.00
W	总宽度	0.6400
H	总高度	0.5000
L_m	单个锯齿长度	0.4000
W_m	锯齿最大宽度	0.5400
W_fs	正向流动入口壁厚	0.0875
W_rs	反向流动入口壁厚	0.2800
W_f_l	正向流动入口宽度	0.4650
W_r_l	反向流动入口宽度	0.0800
H_b	底部厚度	0.2000
H_m	微通道高度	0.3000
d	喉道处宽度	0.0800

物性参数	去离子水	硅
c_p /J·kg^-1·K^-1	4184.1	700
ρ/kg·m^-3	998.21	2329
k/W·m^-1·K^-1	0.598	130
μ/μPa·s^-1	1001.6	—

物性参数	去离子水	硅
c_p /J·kg^-1·K^-1	4184.1	700
ρ/kg·m^-3	998.21	2329
k/W·m^-1·K^-1	0.598	130
μ/μPa·s^-1	1001.6	—

序号	网格数	T_out/K	参考基准误差 /%	Δp/Pa	参考基准误差 /%
Gird 1	2455459	332.3598	0.128	3661.7063	6.066
Gird 2	4510643	332.6778	0.032	3573.3352	3.506
Gird 3	6126720	332.7453	0.011	3452.8653	0.017
Gird 4	9074234	332.7834	—	3452.3023	—