Study on the heat transfer characteristics of microchannels under the action of fin-shaped spoilers

doi:10.11949/0438-1157.20240332

Abstract

Abstract:

This study employs the finite volume method (FVM) and dynamic mesh technology to simulate the active disturbance heat transfer of fin-shaped vortex generators in a three-dimensional rectangular microchannel. The simulation conditions are laminar Reynolds numbers (Re) ranging from 50 to 250, and vortex generator oscillation frequencies (f) from 10 to 50 Hz. The results indicate that the Nusselt number (Nu), friction coefficient (fr), and performance evaluation criterion (PEC) exhibit quasi-sinusoidal variations within a certain range, with a period matching that of the vortex generator oscillation. Under the conditions of Re=50 and f=10—50 Hz, the PEC ranges from 0.75 to 1.52 and increases with frequency. Especially in the low frequency range, PEC shows a certain monotonicity. By introducing fin-shaped spoilers, the heat transfer efficiency of the microchannel has been significantly improved. Compared to a smooth rectangular microchannel (PEC=1), the PEC increases by 5% at Re=50 and f=10 Hz, and by 30% at Re=50 and f=50 Hz.

Key words: dynamic grid, heat transfer characteristic, thermodynamics, fin-shaped spoiler, microchannel, numerical simulation

摘要：

基于有限体积（FVM）离散方法和动网格技术，模拟三维矩形微通道内的翅形扰流片的主动扰流换热情况。模拟条件为层流Reynolds数50~250，扰流片的运动频率（f）10~50 Hz。结果表明，不同运动频率下的Nusselt数、摩阻系数（fr）及综合评价因子（PEC）均在一定范围内呈现类正弦变化，其周期与扰流片运动周期相同。在Re=50、f=10~50工况下，扰流片作用下的微通道PEC为0.75~1.52，并随频率的增加而上升。特别是在低频范围内，PEC表现出一定的单调性。通过引入翅形扰流片，微通道的传热效率得到了显著的提高，相较于光滑矩形微通道（PEC=1），在Re=50、f=10 Hz工况下PEC提高了5%，在Re=50、f=50 Hz的条件下PEC提高了30%。

关键词: 动网格, 换热特性, 热力学, 翅形扰流片, 微通道, 数值模拟

CLC Number:

TK 124

Juhui CHEN, Tong SU, Dan LI, Liwei CHEN, Wensheng LYU, Fanqi MENG. Study on the heat transfer characteristics of microchannels under the action of fin-shaped spoilers[J]. CIESC Journal, 2024, 75(9): 3122-3132.

陈巨辉, 苏潼, 李丹, 陈立伟, 吕文生, 孟凡奇. 翅形扰流片作用下的微通道换热特性[J]. 化工学报, 2024, 75(9): 3122-3132.

Figures/Tables 17

Fig.1 Grid independence verification

Table 1 Mesh independence validation

网格数/10⁴	Nu	偏差/%
62	3.01	35
86	3.93	15.7
108	4.44	4.72
136	4.64	0.43
151	4.66	0

Fig.2 Model verification

Fig.3 Comparison of pitching drag coefficients

Fig.4 Change in angle over time

Fig.5 The trend of Nusselt number varying with Reynolds number at different frequencies

Fig.6 The trend of Nusselt number varying with frequency under different Reynolds numbers

Fig.7 Variation of Nussel number over time at different frequencies when Re=50

Fig.8 The temperature monitoring cloud diagram over time (Re=50, f=10 Hz)

Fig.9 Temperature cloud diagram over time (Re= 50, f=10 Hz)

Fig.10 Velocity cloud diagram over time (Re=50, f=10 Hz)

Fig.11 Temperature cloud diagram over time (Re= 200, f=10 Hz)

Fig.12 Velocity cloud diagram over time (Re=200, f=10 Hz)

Fig.13 Temperature cloud diagram over time (Re=200, f=50 Hz)

Fig.14 Velocity cloud diagram over time (Re=200, f=50 Hz)

Fig.15 Trend of friction coefficient with time at different frequencies of Re=50

Fig.16 Trend of PEC coefficient with time at different frequencies of Re=50

References 40

1	齐聪, 李可傲, 李春阳. 微肋结构对纳米流体绕流圆柱热性能的影响[J]. 化工学报, 2021, 72(4): 2006-2017.
	Qi C, Li K A, Li C Y. Influence of micro-rib structures on thermal performance of nanofluids flowing around circular cylinders[J]. CIESC Journal, 2021, 72(4): 2006-2017.
2	李佳旭, 怀英, 刘婷婷, 等. 缠绕管式换热器全模型研究[J]. 化工学报, 2023, 74(12): 4820-4828.
	Li J X, Huai Y, Liu T T, et al. Study on the full model of spiral wound heat exchanger[J]. CIESC Journal, 2023, 74(12): 4820-4828.
3	Sun L, Li J, Xu H, et al. Numerical study on heat transfer and flow characteristics of novel microchannel heat sinks[J]. International Journal of Thermal Sciences, 2022, 176: 107535.
4	Grinham J, Hancock M J, Kumar K, et al. Bioinspired designand optimization for thin film wearable and building cooling systems[J]. Bioinspiration & Biomimetics, 2022, 17(1): 015003.
5	Kumar V, Pathak M, Khan M K. Heat transfer characteristics of a closed-loop two-phase thermosyphon system with a structured heating surface[J]. Journal of Thermal Science and Engineering Applications, 2022, 14(1): 011013.
6	He R D, Wang Z M, Dong F. Influence of heat-transfer surface morphology on boiling-heat-transfer performance[J]. Heat and Mass Transfer, 2022, 58(8): 1303-1318.
7	Zhang Y, Pan M Q. Simulation analysis of the heat transfer performance of an N-type microchannel heat exchanger[J]. Chemical Engineering & Technology, 2020, 43(10): 1930-1938.
8	谷家扬, 陈代飞, 魏世松, 等. 流道截面形状对超临界甲烷在微通道中流动换热特性影响研究[J]. 舰船科学技术, 2023, 45(13): 53-58.
	Gu J Y, Chen D F, Wei S S, et al. Flow channel cross section shape for supercritical methane in microchannels. Study on the influence of flow heat transfer characteristics[J]. Ship Science and Technology, 2023, 45(13): 53-58.
9	王长亮, 田茂诚. 微小通道内低Reynolds数液-液两相流动与换热特性实验研究[J]. 化工学报, 2021, 72(3): 1322-1332.
	Wang C L, Tian M C. Experimental research on low Reynolds number liquid-liquid two-phase flow and heat transfer characteristics in micro channels[J]. CIESC Journal, 2021, 72(3): 1322-1332.
10	刘璐, 丁国良, 庄大伟, 等. 微通道换热器百叶窗翅片排水性能的CFD模拟[J]. 化工学报, 2021, 72(S1): 91-97.
	Liu L, Ding G L, Zhuang D W, et al. CFD simulation of water drainage performance of louver-typed microchannel heat exchanger[J]. CIESC Journal, 2021, 72(S1): 91-97.
11	余同谱. 微流控系统中被动与主动式强化换热模拟研究[D]. 马鞍山: 安徽工业大学, 2018.
	Yu T P. Simulation study of passive and active methods for heat transfer enhancement in microfluidic systems[D]. Maanshan: Anhui Universit of Technology, 2018.
12	Liu G H, Xu J L, Yang Y P. Seed bubbles trigger boiling heat transfer in silicon microchannels[J]. Microfluidics and Nanofluidics, 2010, 8(3): 341-359.
13	陈立伟. 翅形扰流片作用下的微通道流动与换热特性研究[D]. 哈尔滨: 哈尔滨理工大学, 2023.
	Chen L W. Research on flow and heat transfer characteristics of microchannels under the action of fin-shaped spoilers[D]. Harbin: Harbin University of Science and Technology, 2023.
14	苏占科, 徐超, 姜小放, 等. 基于动网格的液压缸无杆腔节流缓冲数值模拟[J]. 液压气动与密封, 2022, 42(11): 25-29.
	Su Z K, Xu C, Jiang X F, et al. Numerical simulation of rodless cavity throttling buffer for hydraulic cylinder based on dynamic grid[J]. Hydraulics Pneumatics & Seals, 2022, 42(11): 25-29.
15	张宇鑫, 曹曙阳, 操金鑫. 自动网格体系在柱体绕流大涡模拟中的适用性评估[J]. 同济大学学报(自然科学版), 2023, 51(4): 542-550.
	Zhang Y X, Cao S Y, Cao J X. Assessment of applicability of auto-generated grid in large eddy simulation of flow around a cylinder[J]. Journal of Tongji University (Natural Science), 2023, 51(4): 542-550.
16	何晓晖, 孙宏才, 程健生, 等. 基于动网格的液压阀阀芯启闭中的液动力分析[J]. 解放军理工大学学报(自然科学版), 2011, 12(5): 491-495.
	He X H, Sun H C, Cheng J S, et al. Numerical analysis on flow force of moving ball valve with dynamic mesh[J]. Journal of PLA University of Science and Technology (Natural Science Edition), 2011, 12(5): 491-495.
17	冯亿坤, 苏玉民, 徐小军, 等. 基于CFD的仿生水动力学数值计算方法及其验证[J]. 船舶力学, 2024, 28(2): 204-219.
	Feng Y K, Su Y M, Xu X J, et al. Numerical simulation method and verification of bio-hydrodynamics based on CFD[J]. Journal of Ship Mechanics, 2024, 28(2): 204-219.
18	田建辉, 胡晨明. 高速弹体出水过程数值模拟[J]. 兵器装备工程学报, 2023, 44(12): 73-78, 176.
	Tian J H, Hu C M. Numerical simulation of high speed projectile discharge process[J]. Journal of Ordnance Equipment Engineering, 2023, 44(12): 73-78, 176.
19	常志荣, 黄松, 曹廷发, 等. 基于动网格的逆止阀关闭特性研究[J]. 阀门, 2023(6): 722-726.
	Chang Z R, Huang S, Cao T F, et al. Research on closing characteristics of check valve based on dynamic mesh[J]. Valve, 2023(6): 722-726.
20	陈真真, 陈洪强, 黄磊, 等. 分形微通道换热过程强化研究进展[J]. 工程科学学报, 2022, 44(11): 1966-1977.
	Chen Z Z, Chen H Q, Huang L, et al. Research progress on fractal microchannels for heat transfer process intensification[J]. Chinese Journal of Engineering, 2022, 44(11): 1966-1977.
21	冯玉祥. 梯形凸肋与凹腔微通道流动换热研究[D]. 哈尔滨: 哈尔滨工程大学, 2023.
	Feng Y X. Study on flow and heat transfer of trapezoidal convex ribs and concave microchannels[D]. Harbin: Harbin Engineering University, 2023.
22	Wang B X, Peng X F. Experimental investigation on liquid forced-convection heat transfer through microchannels[J]. International Journal of Heat and Mass Transfer, 1994, 37(S1): 73-82.
23	辛明道, 师晋生. 微矩形槽道内的受迫对流换热性能实验[J]. 重庆大学学报(自然科学版), 1994, 17(3): 117-122.
	Xin M D, Shi J S. Experiments on forced convective heat transfer performance in rectangular microchannels[J]. Journal of Chongqing University, 1994, 17(3): 117-122.
24	Sikdar P, Datta A, Biswas N, et al. Identifying improved microchannel configuration with triangular cavities and different rib structures through evaluation of thermal performance and entropy generation number[J]. Physics of Fluids, 2020, 32(3): 036601.
25	许海涛. 基于通道内扰流与滑移减阻的双层微通道热沉强化传热[D]. 北京: 华北电力大学, 2022.
	Xu H T. Enhanced heat transfer with double-layer microchannel heat sink based on intra-channel perturbation and slip drag reduction[D]. Beijing: North China Electric Power University, 2022.
26	李永吉. 横断扰流微通道流动及传热特性研究[D]. 哈尔滨: 哈尔滨工业大学, 2019.
	Li Y J. Study on the flow and heat transfer characteristics of the interrupted micro-channel heat sink with ribs[D]. Harbin: Harbin Institute of Technology, 2019.
27	穆金霞, 殷学锋. 微通道反应器在合成反应中的应用[J]. 化学进展, 2008, 20(1): 60-75.
	Mu J X, Yin X F. Application of microfluidic reactors on synthesis reactions[J]. Progress in Chemistry, 2008, 20(1): 60-75.
28	Li H W, Hu Z, Meng K, et al. Study on the evolution characteristics of temperature and heat storage of the soil surrounding the tunnel with years[J]. Energy & Buildings, 2022, 257: 111804.
29	Qiu J C, Zhao Q, Lu M X, et al. Experimental study of flow boiling heat transfer and pressure drop in stepped oblique-finned microchannel heat sink[J]. Case Studies in Thermal Engineering, 2022, 30: 101745.
30	Chen P Z, Pan Z L. Heat transfer analysis of flat heat pipe with enhanced microchannel shape[J]. IEEE Access, 2021, 9: 120833-120843.
31	Zhu Q F, Jin Y Y, Chen J J, et al. Computational study of rib shape and configuration for heat transfer and fluid flow characteristics of microchannel heat sinks with fan-shaped cavities[J]. Applied Thermal Engineering, 2021, 195: 117171.
32	季家东, 高润淼, 陈卫强, 等. 螺旋弹性管束换热器壳程振动强化传热研究[J]. 工程热物理学报, 2021, 42(10): 2692-2699.
	Ji J D, Gao R M, Chen W Q, et al. Study on shell-side vibration-enhanced heat transfer of helical elastic tube heat exchanger[J]. Journal of Engineering Thermophysics, 2021, 42(10): 2692-2699.
33	赵珀, 李炎, 杜强, 等. 基于动网格与滑移网格技术的隧道列车活塞风计算对比[J]. 制冷与空调, 2021, 35(6): 797-802.
	Zhao P, Li Y, Du Q, et al. Comparison of tunnel piston wind calculation based on dynamic mesh and sliding mesh technology[J]. Refrigeration & Air Conditioning, 2021, 35(6): 797-802.
34	甘甜, 王伟, 赵耀华, 等.地铁活塞风Fluent动网格模型的建立与验证[J]. 建筑科学, 2011, 27(8): 75-81.
	Gan T, Wang W, Zhao Y H, et al. Establishment and validation of the subway piston wind model with dynamic mesh method[J]. Building Science, 2011, 27(8): 75-81.
35	王坤, 李雪斌, 杜标. T型槽干气密封数值模拟网格独立性分析[J]. 数码设计, 2017, 6(4): 66-69.
	Wang K, Li X B, Du B. Mesh independence analysis of numerical simulation in T-groove dry gas seal[J]. Peak Data Science, 2017, 6(4): 66-69.
36	邓成香, 宋鹏云. 螺旋槽干气密封数值模拟网格独立性分析[J]. 润滑与密封, 2016, 41(7): 86-90, 101.
	Deng C X, Song P Y. Mesh independence analysis of numerical simulation in spiral groove dry gas seal[J]. Lubrication Engineering, 2016, 41(7): 86-90, 101.
37	Ebrahimi A, Rikhtegar F, Sabaghan A, et al. Heat transfer and entropy generation in a microchannel with longitudinal vortex generators using nanofluids[J]. Energy, 2016, 101: 190-201.
38	范凌灏. 矩形微通道内流动传热特性的数值模拟及结构优化[D]. 济南: 山东大学, 2020.
	Fan L H. Numerical analysis and structural optimization of flow and heat transfer characteristics in rectangular microchannels[D]. Jinan: Shandong University, 2020.
39	Gharali K, Johnson D A. Dynamic stall simulation of a pitching airfoil under unsteady freestream velocity[J]. Journal of Fluids and Structures, 2013, 42: 228-244.
40	Lee T, Gerontakos P. Investigation of flow over an oscillating airfoil[J]. Journal of Fluid Mechanics, 2004, 512: 313-341.

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