A pore-scale investigation of the transient response of forced convection in porous media to inlet ramp inputs
A pore-scale investigation of the transient response of forced convection in porous media to inlet ramp inputs
This paper investigates the transient response of forced convection of heat in a reticulated porous medium through taking a pore-scale approach. The thermal system is subject to a ramp disturbance superimposed on the entrance flow temperature/velocity. The developed model consisted of ten cylindrical obstacles aligned in a staggered arrangement with set isothermal boundary conditions. A few types of fluids, along with different values of porosity and Reynolds number, are considered. Assuming a laminar flow, the unsteady Navier Stokes and energy equations are solved numerically. The temporally developing flow and temperature fields as well as the surface-averaged Nusselt numbers are used to explore the transient response of the system. Also, a response lag ratio (RLR) is defined to further characterize the transient response of the system. The results reveal that an increase in amplitude increases the RLR. Nonetheless, an increase in ramp duration decreases the RLR, particularly for high-density fluids. Interestingly, it is found that the Reynolds number has almost negligible effects upon RLR. This study clearly reflects the importance of conducting pore-scale analyses for understanding the transient response of heat convection in porous media.
Habib, Rabeeah
4a0a29f8-dcfe-4002-b369-d534c4e63985
Yadollahi, Bijan
76b7347b-00ec-482c-863f-9e6a60b1815b
Karimi, Nader
620646d6-27c9-4e1e-948f-f23e4a1e773a
21 August 2020
Habib, Rabeeah
4a0a29f8-dcfe-4002-b369-d534c4e63985
Yadollahi, Bijan
76b7347b-00ec-482c-863f-9e6a60b1815b
Karimi, Nader
620646d6-27c9-4e1e-948f-f23e4a1e773a
Habib, Rabeeah, Yadollahi, Bijan and Karimi, Nader
(2020)
A pore-scale investigation of the transient response of forced convection in porous media to inlet ramp inputs.
Journal of Energy Resources Technology, 142 (11).
(doi:10.1115/1.4047968).
Abstract
This paper investigates the transient response of forced convection of heat in a reticulated porous medium through taking a pore-scale approach. The thermal system is subject to a ramp disturbance superimposed on the entrance flow temperature/velocity. The developed model consisted of ten cylindrical obstacles aligned in a staggered arrangement with set isothermal boundary conditions. A few types of fluids, along with different values of porosity and Reynolds number, are considered. Assuming a laminar flow, the unsteady Navier Stokes and energy equations are solved numerically. The temporally developing flow and temperature fields as well as the surface-averaged Nusselt numbers are used to explore the transient response of the system. Also, a response lag ratio (RLR) is defined to further characterize the transient response of the system. The results reveal that an increase in amplitude increases the RLR. Nonetheless, an increase in ramp duration decreases the RLR, particularly for high-density fluids. Interestingly, it is found that the Reynolds number has almost negligible effects upon RLR. This study clearly reflects the importance of conducting pore-scale analyses for understanding the transient response of heat convection in porous media.
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jert_142_11_112112
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Accepted/In Press date: 8 June 2020
Published date: 21 August 2020
Identifiers
Local EPrints ID: 509102
URI: http://eprints.soton.ac.uk/id/eprint/509102
ISSN: 0195-0738
PURE UUID: 80942ac8-7558-4f46-a45d-9983fbf6320c
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Date deposited: 11 Feb 2026 17:44
Last modified: 12 Feb 2026 03:31
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Author:
Rabeeah Habib
Author:
Bijan Yadollahi
Author:
Nader Karimi
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