## THERMAL SCIENCE

International Scientific Journal

### Thermal Science - Online First

online first only
### Control temperature fluctuations in two-phase CuO-water nanofluid by transfiguration of the enclosures

**ABSTRACT**

The innovation of this paper is to simulate two-phase nanofluid natural convection inside the transformable enclosure to control the heat transfer rate under different heat flux. Heat transfer of a two-phase CuO-water nanofluid in an enclosure under different heat flux has many industrial applications including energy storage systems, thermal control of electronic devices and cooling of radioactive waste containers. The Lattice Boltzmann Method based on the D2Q9 method has been utilized for modeling velocity and temperature fields. Streamlines, isotherms and nanoparticle volume fraction, have been investigated for control the heat transfer rate for several cases. The purpose of this feasibility study is to achieve uniform temperature profiles and Tmax < 50ÂșC under different heat flux. Natural convection heat transfer in the rectangular and parallelogram enclosures with positive and negative angular adiabatic walls were simulated. The average wall temperature under heat flux boundary condition has been studied to predict optimal levels of effective factors to control the maximum wall temperature. The results illustrated parallelogram enclosures with positive angle of case 1 and case 3 and 4 with rectangular enclosures were best cases for considering physical conditions. Average of temperature for these cases were 37.9, 29.7 and 38.2, respectively.

**KEYWORDS**

PAPER SUBMITTED: 2020-05-24

PAPER REVISED: 2020-10-27

PAPER ACCEPTED: 2020-10-29

PUBLISHED ONLINE: 2020-12-05

- Samarbakhsh, S., et al., Experimental and Numerical Analysis of Eight Different Volutes with The Same Impeller in A Squirrel-Cage Fan, 2nd European conference of Control and Mechanical Engineering, pp. 198-203, 2011.
- Alinejad, J., et al., Aerodynamic Optimization in The Rotor of Centrifugal Fan Using Combined Laser Doppler Anemometry and CFD Modeling, World Applied Sciences Journal, 17 (2012), 10, pp. 1316-1323.
- Alinejad, J., et al., Accretion of The Efficiency of a Forward-Curved Centrifugal Fan by Modification of the Rotor Geometry: Computational and Experimental Study, International Journal of Fluid Mechanics Research, 40 (2013), 6, pp. 469-481.
- Esfahani, J. A., et al., Lattice Boltzmann Simulation of Viscous-Fluid Flow and Conjugate Heat Transfer in A Rectangular Cavity with A Heated Moving Wall, Thermophysics and Aeromechanics, 20 (2013), 5, pp. 613-620.
- Esfahani, J. A., et al., Entropy Generation of Conjugate Natural Convection in Enclosures: The Lattice Boltzmann Method, International Journal of Multiphase Flow, 27 (2013), 3, pp. 498-505.
- Alinejad, J., et al., Lattice Boltzmann Simulation of Forced Convection Over an Electronic Board with Multiple Obstacles, Heat Transfer Research, 45 (2014), 3, pp. 241-262.
- Alinejad, J., et al., Numerical Stabilization of Three-Dimensional Turbulent Natural Convection Around Isothermal Cylinder, Journal of Thermophysics and Heat Transfer, 30 (2016), 1, pp. 94-102.
- Alinejad, J., et al., Lattice Boltzmann Simulation of EGM and Solid Particle Trajectory Due to Conjugate Natural Convection, Aerospace Science and Technology, 4 (2016), 1, pp. 36-43.
- Alinejad, J., et al., Taguchi Optimization Approach for Three-Dimensional Nanofluid Natural Convection in a Transformable Enclosure, Journal of Thermophysics and Heat Transfer, 31 (2016), 1, pp. 1-7.
- Alinejad, J., et al., Taguchi Design of Three Dimensional Simulations for Optimization of Turbulent Mixed Convection in A Cavity, Meccanica, 52 (2017), 4-5, pp. 925-938.
- Alinejad, J., et al., Optimization of 3-D Natural Convection Around the Isothermal Cylinder Using Taguchi Method, Journal of Applied Mechanics and Technical Physics, 57 (2016), 1, pp. 117-126.
- Fallah, K., et al., The Influence of Micro Air Jets On Mixing Augmentation of Fuel in Cavity Flameholder at Supersonic Flow, Aerospace Science and Technology, 76 (2018), 1, pp. 187-193.
- Peiravi, M. M., et al., Numerical Study of Fins Arrangement and Nanofluids Effects On Three-Dimensional Natural Convection in The Cubical Enclosure, Transp Phenom Nano Micro Scales, 7 (2019), 2, pp. 97-112.
- Peiravi, M. M., et al., Hybrid Conduction, Convection and Radiation Heat Transfer Simulation in A Channel with Rectangular Cylinder, Journal of Thermal Analysis and Calorimetry, published online 01 Nov. 2019.
- Peiravi, M. M., et al., 3D Optimization of Baffle Arrangement in A Multi-Phase Nanofluid Natural Convection Based On Numerical Simulation, International Journal of Numerical Methods for Heat and Fluid Flow, published online 19 July. 2019.
- Liang, G., et al., Two-Phase Heat Transfer of Multi-Droplet Impact On Liquid Film, International Journal of Heat and Mass Transfer, 139 (2019), 1, pp. 832-847.
- Boubaker, R., et al., Effect of Self-Rewetting Fluids On the Liquid/Vapor Phase Change in A Porous Media of Two-Phase Heat Transfer Devices, International Journal of Heat and Mass Transfer, 136 (2019), 1, pp. 655-663.
- Park, Y., et al., Heat Transfer Augmentation in Two-Phase Flow Heat Exchanger Using Porous Microstructures and A Hydrophobic Coating, Applied Thermal Engineering, 153 (2019), 1, pp. 433-447.
- Burk, B. E., et al., Computational Examination of Two-Phase Microchannel Heat Transfer Correlations with Conjugate Heat Spreading, International Journal of Heat and Mass Transfer, 132 (2019), 1, pp. 68-79.
- Zhang, K., et al., Experimental Investigations On Single-Phase Convection and Two-Phase Flow Boiling Heat Transfer in an Inclined Rod Bundle, Applied Thermal Engineering, 148 (2019), 1, pp. 340-351.
- Liu, Y., et al., Uncertainty Quantification of Two-Phase Flow and Boiling Heat Transfer Simulations Through a Data-Driven Modular Bayesian Approach, International Journal of Heat and Mass Transfer, 138 (2019), 1, pp. 1096-1116.
- Jiang, G., et al., Flow and Heat Transfer Characteristics of Mist/Steam Two-Phase Flow in The U-Shaped Cooling Passage with 60 Deg. Ribs International Communications in Heat and Mass Transfer, 105 (2019), 1, pp. 73-83.
- Song, Q., et al., R14 Flow Condensation Heat Transfer Performance: Measurements and Modeling Based On Two-Phase Flow Patterns, International Journal of Heat and Mass Transfer, 136 (2019), 1, pp. 298-311.
- Lee, J., et al., Experimental and Computational Investigation On Two-Phase Flow and Heat Transfer of Highly Subcooled Flow Boiling in Vertical Upflow, International Journal of Heat and Mass Transfer, 136 (2019), 1, pp. 1199-1216.
- Moezzi, M., et al., Hysteretic Heat Transfer Study of Liquid-Liquid Two-Phase Flow in A T-Junction Microchannel, International Journal of Heat and Fluid Flow, 77 (2019), 1, pp. 366-376.
- Zhang, X., et al., Two-Phase Flow and Heat Transfer in A Self-Developed MRI Compatible LN2 Cryoprobe and Its Experimental Evaluation, International Journal of Heat and Mass Transfer, 136 (2019), 2, pp. 709-718.
- Domairry Ganji, D., et al., Evaluation of The Heat Transfer Rate Increases in Retention Pools Nuclear Waste. International Journal of Nano Dimension, International Journal of Nano Dimension, 6 (2015), 4, pp. 385-398.
- Asadi, Z., et al., Survey of Nano-Bio Convection Flow in A Horizontal Channel by Using AGM and FlexPDE Software, 3rd Conference of Heat and Mass Transfer, Amol, Iran, 2017.
- Asadi, Z., et al., Survey and Analysis of the Thermal Flux of a Nanofluid Droplet with A Variable Conductive Coefficient in The Cooling of Nuclear Reactors, 1st International Conference on Modern Technologies in Science, Amol, Iran, 2017.
- Domairry Ganji, D., et al., Survey On Increasing the Heat Transfer Rate in Spent Fuel (Nuclear Wastes) Pool with Free Convection Boundary Layer Flow On a Vertical Cone in A Porous Medium for Newtonian Nanofluid with Application of Homotopy Analysis Method (HAM), 8th international Conference on New Advances in Engineering Sciences, Amol, Iran, 2014.
- Aliyari, f., et al., Analysis of Non-Newtonian Nanofluid Natural Convection Flow, Sodium Alginate (SA) Between Two Vertical Flat Plates, 17th Fluid Dynamics Conference, Shahrood, Iran, 2017.
- Mezrhab, A., et al., Lattice Boltzmann Modeling of Natural Convection in an Inclined Square Enclosure with Partitions Attached to Its Cold Wall, International Journal of Heat and Fluid Flow, 27 (2006), 3, pp. 456-465.
- Xuan, Y., et al., Lattice Boltzmann Model for Nanofluids, Heat and Mass Transfer, 41 (2005), 3, pp. 199-205.
- Ahmed, M., et al., Natural Convection in A Differentially-Heated Square Enclosure filled with A Nanofluid: Significance of The Thermophoresis Force and Slip/Drift Velocity, International Communications in Heat and Mass Transfer, 58 (2014), 4, pp. 1-11.
- Domairry Ganji, D., et al., Evaluation of The Heat Transfer Rate Increases in Retention Pools Nuclear Waste. International Journal of Nano Dimension, International Journal of Nano Dimension, 6 (2015), 4, pp. 385-398.
- Peiravi, M. M., et al., Survey of Nano-Bio Convection Flow in A Horizontal Channel by Using AGM and FlexPDE Software, 3rd Conference of Heat and Mass Transfer, Nov 22, Amol, 2017.
- Peiravi, M. M., et al., Survey and Analysis of the Thermal Flux of a Nanofluid Droplet with A Variable Conductive Coefficient in The Cooling of Nuclear Reactors, 1st International Conference on Modern Technologies in Science, Sep 7, Amol, 2017.
- Domairry Ganji, D., et al., Survey On Increasing the Heat Transfer Rate in Spent Fuel (Nuclear Wastes) Pool with Free Convection Boundary Layer Flow On a Vertical Cone in A Porous Medium for Newtonian Nanofluid with Application of Homotopy Analysis Method (HAM), 8th international Conference on New Advances in Engineering Sciences, May 11, Amol, 2014.
- Peiravi, M. M., et al., Analysis of Non-Newtonian Nanofluid Natural Convection Flow, Sodium Alginate (SA) Between Two Vertical Flat Plates, publication description17th Fluid Dynamics Conference, Aug 27, Shahrood, 2017.
- Alinejad, J., et al., Numerical analysis of secondary droplets characteristics due to drop impacting on 3D cylinders considering dynamic contact angle, Meccanica, 55 (2020), 10, pp. 1975-2002.