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Effects of longitudinal vortex generator pairs in transverse microchambers on thermal–hydraulic performances and entropy generation in an interrupted microchannel heat sink

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Abstract

A novel interrupted microchannel heat sink with longitudinal vortex generator (LVG) pairs in transverse microchambers is presented in this study. The effects of LVG pairs in transverse microchambers on thermal–hydraulic performances due to the Nusselt number and flow friction, as well as the entropy generation due to the heat transfer and flow irreversibility in microchannel are analyzed for Reynolds number of 133–596. The studied parameters of LVG pairs include height (H = 0.025–0.175 mm), transverse spacing (S = 0.01–0.07 mm) and setting angle (A = 30–75º). The results indicate that LVG pairs plays a significant effect on the thermal–hydraulic performance and entropy generation in microchannel as consequence of the perturbation generated by longitudinal vortexes in transverse microchambers. The greatest overall thermal performance factor of 1.45 and the lowest augmentation entropy generation number of 0.764 are both obtained by LVG pairs with H = 0.075 mm, S = 0.01 mm and A = 75º at Reynolds number of 596.

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Abbreviations

A :

Setting angle of LVG pair (°)

A w :

Computational domain bottom area (m2)

A con :

Convective heat transfer area (m2)

c p :

Specific heat capacity (J kg−1 K−1)

Dh :

Hydraulic diameter (m)

f :

Friction factor h Heat transfer coefficient (W m−2 K−1)

H :

Height of LVG pair (m)

H ch :

Height of single microchannel (m)

k :

Thermal conductivity (W m−1 K−1)

L ch :

Length of single microchannel (m)

Nu:

Nusselt number

N s,a :

Augmentation entropy generation number

p :

Pressure (Pa)

q :

Heat flux (W m−2)

Re:

Reynolds number

S :

Transverse spacing of LVG pair (m)

\({S}_{\mathrm{gen}}^{*}\) :

Local total entropy generation (W m−3 K−1)

\(S_{{\text{gen}},\Delta T}^*\) :

Local heat transfer entropy generation (W m−3 K−1)

\(S_{{\text{gen}},\Delta P}^*\) :

Local flow entropy generation (W m−3 K−1)

S gen :

Global total entropy generation (W K−1)

\(S_{{\text{gen}},\Delta T}\) :

Global heat transfer entropy generation (W K−1)

\(S_{{\text{gen}},\Delta P}\) :

Global flow entropy generation (W K−1)

T :

Temperature (K)

u, v, w :

Velocity components (m s−1)

V :

Fluid volume (m3)

W ch :

Width of single microchannel (m)

x, y, z :

Cartesian coordinates (m)

ρ :

Density (kg m−3)

μ :

Dynamic viscosity (kg m−1 s−1)

ave:

Average

D:

Darcy

f:

Fluid

s:

Solid

in:

inlet

out:

Outlet

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Acknowledgements

This research has been supported by National Natural Science Foundation of China (No. 22168003 and No. 21666005), and the Dean Project of Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology (No. 2019Z012).

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Authors and Affiliations

  1. School of Mechanical Engineering, Guangxi University, Nanning, 530004, China

    Zhenfei Feng, Yongqi Lan, Zhenjun Hu & Siyao Zheng

  2. Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning, 530004, China

    Zhenfei Feng

  3. School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China

    Yanjuan Zhang & Zuqiang Huang

  4. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510641, China

    Jinxin Zhang

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  1. Zhenfei Feng
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Contributions

ZF contributed to writing—original draft, funding acquisition, conceptualization, methodology, supervision, validation, project administration, writing—review & editing. YL contributed to investigation, data curation, formal analysis, validation, writing—original draft, writing—review & editing. ZH contributed to writing—review & editing, investigation, visualization, validation. SZ contributed to writing—review & editing, visualization, validation. YZ contributed to funding acquisition, writing—review & editing. ZH contributed to project administration, writing—review & editing. JZ contributed to software, resources, writing—review & editing.

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Correspondence to Zhenfei Feng.

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Feng, Z., Lan, Y., Hu, Z. et al. Effects of longitudinal vortex generator pairs in transverse microchambers on thermal–hydraulic performances and entropy generation in an interrupted microchannel heat sink. J Therm Anal Calorim 147, 8551–8567 (2022). https://doi.org/10.1007/s10973-021-11133-2

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