MHD mixed convection flow through a diverging channel with heated circular obstacle

2016 ◽  
Author(s):  
Md. S. Alam ◽  
J. Shaha ◽  
M. A. H. Khan ◽  
R. Nasrin
Keyword(s):  
Mixed Convection ◽  
Convection Flow ◽  
Mixed Convection Flow ◽  
Diverging Channel ◽  
Flow Through

scholarly journals Influence of differently shaped copper nanoparticles in mixed convection flow through a curved wavy channel

2021 ◽  
Vol 60 (3) ◽  
pp. 3305-3314
Author(s):  
Muhammad Qasim ◽  
Muhammad Usman Ashraf ◽  
Dianchen Lu ◽  
Abid Hussanan
Keyword(s):  
Mixed Convection ◽  
Copper Nanoparticles ◽  
Convection Flow ◽  
Mixed Convection Flow ◽  
Wavy Channel ◽  
Flow Through

Improvement of Correlative Approaches for Mixed Convective Flow Through a Horizontal Vent

2019 ◽  
Vol 141 (3) ◽  
Author(s):  
Kevin Varrall ◽  
Hugues Pretrel ◽  
Samuel Vaux ◽  
Olivier Vauquelin
Keyword(s):  
Mixed Convection ◽  
Literature Survey ◽  
Convection Flow ◽  
Safety Engineering ◽  
Mixed Convection Flow ◽  
Flow Rates ◽  
Laboratory Facility ◽  
Flow Through ◽  
Mixed Convective Flow ◽  
Horizontal Vent

This study deals with the mixed convection flow through a shallow horizontal vent linking two compartments (one over the other). Depending on the temperature difference of gas as well as the ventilation flow rate between the two compartments, the flow through the vent can be bi- or uni-directional. A literature survey highlights that three correlations are used in safety engineering to calculate these upward and downward mixed convection flow rates. Unfortunately, for the same conditions, these correlations give very different results and, to date, there is no common agreement in the scientific community to identify quantitatively the most accurate model. This study proposes a new assessment of these correlations based on new experimental data obtained from the laboratory facility as well from the industrial apparatus. In addition, an improvement of the best model is proposed which better reproduced the experimental results.

scholarly journals Thermal and hydrodynamic characteristics of forced and mixed convection flow through vertical rectangular channels

2008 ◽  
Vol 12 (2) ◽  
pp. 103-117
Author(s):  
Abdalla Hanafi ◽  
Safaa Mahmoud ◽  
Hesham Elbakhshawangy
Keyword(s):  
Nusselt Number ◽  
Mixed Convection ◽  
Flow Direction ◽  
Rectangular Channel ◽  
Convection Flow ◽  
Temperature Profiles ◽  
Mixed Convection Flow ◽  
Downward Flow ◽  
Flow Through ◽  
Flow Directions

This paper presents experimental and numerical studies for the case of turbulent forced and mixed convection flow of water through narrow vertical rectangular channel. The channel is composed of two parallel plates which are heated at a uniform heat flux, whereas, the other two sides of the channel are thermally insulated. The plates are of 64 mm in width, 800 mm in height, and separated from each other at a narrow gap of 2.7 mm. The Nusselt number distribution along the flow direction normalized by the Nusselt number for the case of turbulent forced convection flow is obtained experimentally with a comparison with the numerical results obtained from a commercial computer code. The quantitative determination of the nor- malized Nusselt number with respect to the dimension-less number Z = (Gr/Re21/8Pr0.5) is presented with a comparison with previous experimental results. Qualitative results are presented for the normalized temperature and velocity profiles in the transverse direction with a comparison between the forced and mixed convection flow for both the cases of upward and downward flow directions. The effect of the axial locations and the parameter Gr/Re on the variation of the normalized temperature profiles in the transverse direction for both the regions of forced and mixed convection and for both of the upward and downward flow directions are obtained. The normalized velocity profiles in the transverse directions are also determined at different inlet velocity and heat fluxes for the previous cases. It is found that the normalized Nusselt number is greater than one in the mixed convection region for both the cases of upward and downward flow and correlated well with the dimension-less parameter Z for both of the forced and mixed convection regions. The temperature profiles increase with increasing the axial location along the flow direction or the parameter Gr/Re for both of the forced and mixed convection regions, but this increase is more pronounced in the case of the mixed convection flow. For the forced convection region, the velocity profile depends only on Re with no difference between the upward and downward flow directions. Whereas, for the case of mixed convection flow, the velocity profile depends on the parameter Gr/Re with a main difference between upward and downward flow. These results are of great importance for any research reactor using plate type fuel elements or for any engineering application in which mixed convection flow through rectangular channel is encountered. .

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