Analysis of transient mixed convection in a horizontal channel partially heated from below

Authors

DOI:

https://doi.org/10.15587/1729-4061.2021.238649

Keywords:

mixed convection, channel, uniform heat flux, Richardson number, open cavity

Abstract

The heat convection phenomenon has been investigated numerically (mathematically) for a channel located horizontally and partially heated at a uniform heat flux with forced and free heat convection. The investigated horizontal channel with a fluid inlet and the enclosure was exposed to the heat source from the bottom while the channel upper side was kept with a constant temperature equal to fluid outlet temperature. Transient, laminar, incompressible and mixed convective flow is assumed within the channel. Therefore, the flow field is estimated using Navier Stokes equations, which involves the Boussinesq approximation. While the temperature field is calculated using the standard energy model, where, Re, Pr, Ri are Reynolds number, Prandtl number, and Richardson number, respectively. Reynolds number (Re) was changed during the test from 1 to 50 (1, 10, 25, and 50) for each case study, Richardson (Ri) number was changed during the test from 1 to 25 (1, 5, 10, 15, 20, and, 25). The average Nusselt number (Nuav) increases exponentially with the Reynold number for each Richardson number and the local Nusselt number (NuI) rises in the heating point. Then gradually stabilized until reaching the endpoint of the channel while the local Nusselt number increases with a decrease in the Reynolds number over there. In addition, the streamlines and isotherms patterns in case of the very low value of the Reynolds number indicate very low convective heat transfer with all values of Richardson number. Furthermore, near the heat source, the fluid flow rate rise increases the convection heat transfer that clarified the Nusselt number behavior with Reynolds number indicating that maximum Nu No. are 6, 12, 27 and 31 for Re No. 1, 10, 25 and 50, respectively

Supporting Agency

  • The author would like to acknowledge the support of the University of Technology (Baghdad-Iraq).

Author Biography

Mahmoud A. Mashkour, University of Technology

Assistant Professor Doctor

Department of Mechanical Engineering

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Published

2021-08-31

How to Cite

Mashkour, M. A. (2021). Analysis of transient mixed convection in a horizontal channel partially heated from below. Eastern-European Journal of Enterprise Technologies, 4(8(112), 16–22. https://doi.org/10.15587/1729-4061.2021.238649

Issue

Vol. 4 No. 8(112) (2021): Energy-saving technologies and equipment

Section

Energy-saving technologies and equipment

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Copyright (c) 2021 Mahmoud A. Mashkour

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