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Thermal performance improvement in water nanofluid/GNP–SDBS in novel design of double-layer microchannel heat sink with sinusoidal cavities and rectangular ribs

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Abstract

In this numerical study, laminar flow of water nanofluid/GNP–SDBS (graphene nanoplatelet–sodium dodecylbenzene sulfonate) for 0–0.1% solid nanoparticles mass fraction was investigated for Reynolds numbers of 50–1000 in 3D space via finite volume method. In the newly proposed microchannel design, the cooling fluid is moving in countercurrent in the upper and lower layers of the microchannels, and there are cavities and sinusoidal routes on the solid walls of the microchannel, and the presence of rectangular ribs on the flow centerline along the fluid path enhances mixing for cooling fluid and creates better heat transfer for warm surfaces. The results of this study show that this special design of the microchannel can have a substantial increase in Nusselt number and heat transfer so that in the considered geometry by adding solid nanoparticles mass fraction it is possible to increase average Nusselt number for each Reynolds number by approximately 20%. Also, the mixing of the fluid because of formation of secondary flows has a strong effect on making the temperature distribution uniform in the cooling fluid and solid bed (wall) of the microchannel, especially in the lower layer. The upper layer of the microchannel always has a lower temperature due to indirect contact with heat flux compared with the lower layer. In this study, by increasing Reynolds number and mass fraction of solid nanoparticles the Nusselt number is increased and heat resistance of the lower wall of the microchannel is reduced. Based on the investigation of flow field and heat transfer, the use of the proposed design of the microchannel is recommended for Reynolds number less than 300.

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Abbreviations

C :

Mass fraction/wt%

C p :

Specific heat capacity/J Kg−1 K−1

g :

Gravitational acceleration/ms−2

H :

Height/m

k :

Thermal conductivity coefficient/Wm−1k−1

P :

Pressure/Pa

Re :

Reynolds number

U :

Velocity/ms−1—x direction

v :

Velocity/ms−1—y direction

w :

Velocity/ms−1—z direction

μ :

Viscosity/Pa s

ρ :

Density/kgm−3

f:

Fluid

In:

Inner

Out:

Outer

p:

Particle

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Author information

Authors and Affiliations

  1. Mechanical Engineering Dept, Amirkabir University of Technology (Tehran Polytechnic), 424 Hafez Avenue, P.O. Box 15875-4413, Tehran, Iran

    Erfan Khodabandeh

  2. Mechanical Engineering Dept, Isfahan University of Technology, Isfahan, Iran

    Seyed Alireza Rozati

  3. Civil Engineering Dept, University of Louisville, Louisville, USA

    Mohammad Joshaghani

  4. Young Researchers and Elite Club, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran

    Omid Ali Akbari

  5. Department of Chemical Engineering, Iran University of Science and Technology (IUST), Iran Narmak, Tehran, 16846-13114, Iran

    Soheil Akbari

  6. Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran

    Davood Toghraie

Authors
  1. Erfan Khodabandeh
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  2. Seyed Alireza Rozati
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  3. Mohammad Joshaghani
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  4. Omid Ali Akbari
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  5. Soheil Akbari
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  6. Davood Toghraie
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Correspondence to Davood Toghraie.

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Khodabandeh, E., Rozati, S.A., Joshaghani, M. et al. Thermal performance improvement in water nanofluid/GNP–SDBS in novel design of double-layer microchannel heat sink with sinusoidal cavities and rectangular ribs. J Therm Anal Calorim 136, 1333–1345 (2019). https://doi.org/10.1007/s10973-018-7826-2

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