Next Article in Journal
Environmental Impact Assessments of Integrated Food and Non-Food Production Systems in Italy and Denmark
Previous Article in Journal
Design and Modeling of an Integrated Flywheel Magnetic Suspension for Kinetic Energy Storage Systems
Open AccessArticle

Pulsating Flow of CNT–Water Nanofluid Mixed Convection in a Vented Trapezoidal Cavity with an Inner Conductive T-Shaped Object and Magnetic Field Effects

1
Department of Mechanical Engineering, Prince Sultan Endowment for Energy and Environment, Prince Mohammad Bin Fahd University, Al-Khobar 31952, Saudi Arabia
2
Department of Mechanical Engineering, Celal Bayar University, Manisa 45140, Turkey
3
Department of Mechanical Engineering, Technology Faculty, Firat University, Elazig 23119, Turkey
*
Author to whom correspondence should be addressed.
Energies 2020, 13(4), 848; https://doi.org/10.3390/en13040848
Received: 13 December 2019 / Revised: 9 January 2020 / Accepted: 9 January 2020 / Published: 14 February 2020
(This article belongs to the Section Thermal Management)
Mixed convection of carbon-nanotube/water nanofluid in a vented cavity with an inner conductive T-shaped object was examined under pulsating flow conditions under magnetic field effects with finite element method. Effects of different parameters such as Richardson number (between 0.05 and 50), Hartmann number (between 0 and 30), cavity wall inclination (between 0 and 10 ), size (between 0.1 H and 0.4 H) and orientation (between −90 and 90 ) of the T-shaped object, and amplitude (between 0.5 and 0.9) and frequency (Strouhal number between 0.25 and 5) of pulsating flow on the convective flow features were studied. It was observed that the average Nusselt number enhanced with the rise of strength of magnetic field, solid nanoparticle volume fraction, and amplitude of the pulsation, while the effect was opposite for higher values of Ri number and cavity wall inclination angle. The presence of the T-shaped object and adjusting its size and orientation had significant impact on the main flow stream from inlet to outlet and recirculations around the T-shaped object and in the vicinity of hot wall of the cavity along with the magnetic field strength. Pulsating flow resulted in heat transfer enhancement as compared to steady flow case for all configurations. However, the amount of increment was different depending on the variation of the parameters of interest. Heat transfer enhancements were 41.85% and 20.81% when the size of the T-shaped object was increased from 0.1 H to 0.4 H. The T-shaped object can be utilized in the vented cavity as an excellent tool for convective heat transfer control. As highly conductive CNT particles were used in water, significant enhancements in the average Nusselt number between 97% and 108% were obtained both in steady flow and in pulsating flow cases when magnetic field was absent or present. View Full-Text
Keywords: mixed convection; pulsating flow; magnetic field; finite element method; T-shaped object mixed convection; pulsating flow; magnetic field; finite element method; T-shaped object
Show Figures

Figure 1

MDPI and ACS Style

Chamkha, A.J.; Selimefendigil, F.; Oztop, H.F. Pulsating Flow of CNT–Water Nanofluid Mixed Convection in a Vented Trapezoidal Cavity with an Inner Conductive T-Shaped Object and Magnetic Field Effects. Energies 2020, 13, 848.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop