A comprehensive study of two-phase flow and heat transfer of water/Ag nanofluid in an elliptical curved minichannel

doi:10.1016/j.cjche.2019.07.007

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (2): 383-402.DOI: 10.1016/j.cjche.2019.07.007

• Fluid Dynamics and Transport Phenomena • Previous Articles Next Articles

A comprehensive study of two-phase flow and heat transfer of water/Ag nanofluid in an elliptical curved minichannel

Sajad Mir¹, Omid Ali Akbari², Davood Toghraie³, Ghanbarali Sheikhzadeh⁴, Ali Marzban⁴, Saeid Mir¹, Pouyan Talebizadehsardari^5,6

1 Department of Mechanical Engineering, Aligoudarz Branch, Islamic Azad University, Aligoudarz, Iran;
2 Young Researchers and Elite Club, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran;
3 Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran;
4 Department of Mechanical Engineering, University of Kashan, Kashan, Iran;
5 Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City, Vietnam;
6 Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam

Received:2019-04-26 Revised:2019-05-31 Online:2020-05-21 Published:2020-02-28
Contact: Pouyan Talebizadehsardari

A comprehensive study of two-phase flow and heat transfer of water/Ag nanofluid in an elliptical curved minichannel

Sajad Mir¹, Omid Ali Akbari², Davood Toghraie³, Ghanbarali Sheikhzadeh⁴, Ali Marzban⁴, Saeid Mir¹, Pouyan Talebizadehsardari^5,6

1 Department of Mechanical Engineering, Aligoudarz Branch, Islamic Azad University, Aligoudarz, Iran;
2 Young Researchers and Elite Club, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran;
3 Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran;
4 Department of Mechanical Engineering, University of Kashan, Kashan, Iran;
5 Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City, Vietnam;
6 Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam

通讯作者: Pouyan Talebizadehsardari

Abstract

Abstract: In this research, laminar flow and heat transfer of two-phase water/Ag nanofluid with 0-6% volume fraction of nanoparticles at Re=150-700 in a curved geometry are simulated using finite volume method. Studied geometry is an elliptical curved minichannel with curvature angle of 180°. Forced and natural flow of two-phase nanofluid is simulated at Gr=15000, 35000 and 75000. For estimation of nanofluid flow behavior, two-phase mixture method is used. The second-order discretization and SIMPLEC algorithm are used for solving governing equations. The results indicate that the increase of volume fraction of nanoparticles leads to the enhancement of the temperature of central line of flow. The increase of Grashof number (Gr~75000) has a great effect on reduction of dimensionless temperature in central line of flow. Creation of thermal boundary layer at Re=500 and after the angle of 30° becomes significant. In low Grashof numbers (Gr~15000), due to the great effects of temperature gradients close to wall, these regions have significant entropy generation.

Key words: Elliptical minichannel, Mixed convection, Numerical study, Nanofluid, Finite volume method, Friction factor

摘要： In this research, laminar flow and heat transfer of two-phase water/Ag nanofluid with 0-6% volume fraction of nanoparticles at Re=150-700 in a curved geometry are simulated using finite volume method. Studied geometry is an elliptical curved minichannel with curvature angle of 180°. Forced and natural flow of two-phase nanofluid is simulated at Gr=15000, 35000 and 75000. For estimation of nanofluid flow behavior, two-phase mixture method is used. The second-order discretization and SIMPLEC algorithm are used for solving governing equations. The results indicate that the increase of volume fraction of nanoparticles leads to the enhancement of the temperature of central line of flow. The increase of Grashof number (Gr~75000) has a great effect on reduction of dimensionless temperature in central line of flow. Creation of thermal boundary layer at Re=500 and after the angle of 30° becomes significant. In low Grashof numbers (Gr~15000), due to the great effects of temperature gradients close to wall, these regions have significant entropy generation.

关键词: Elliptical minichannel, Mixed convection, Numerical study, Nanofluid, Finite volume method, Friction factor

Sajad Mir, Omid Ali Akbari, Davood Toghraie, Ghanbarali Sheikhzadeh, Ali Marzban, Saeid Mir, Pouyan Talebizadehsardari. A comprehensive study of two-phase flow and heat transfer of water/Ag nanofluid in an elliptical curved minichannel[J]. Chinese Journal of Chemical Engineering, 2020, 28(2): 383-402.

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A comprehensive study of two-phase flow and heat transfer of water/Ag nanofluid in an elliptical curved minichannel

A comprehensive study of two-phase flow and heat transfer of water/Ag nanofluid in an elliptical curved minichannel

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