EXPERIMENTAL EVALUATION OF PACKED BED HEAT TRANSFER RELATIONS
Mohamed Abdel-Hameed Salama;
Abstract
The fluid flow in a spherical porous media has many industrial applications, therefore, it is important to study the relationship between heat• transfer coefficient, flow conditions and porous media type and size, in order to improve the heat transfer rate.
The objective of this research is to obtain the relationship between Nusselt and Reynolds numbers for fluid flow in packed bed for using spheres ofdifferent sizes. Also, to develop a universal relationship for the Nusselt number in a wide range of Reynolds number and compare the results with those for an empty tube.
Several researchers have studied the mechanisms of enhancement of the heat transfer coefficient by different methods, including control on the temperature levels, improving the forced convection heat transfer mode by increasing the disturbances in the fluid flow, or by increase of the heat transfer surface area. Another technique is based on inducing more turbulence, eddies and pressure drop when the flow passes around a rigid body.such as a spheres or other geometrical shapes, which results in increasing the heat transfer coefficient. This technique is adapted in the present work.
The experimental work has covered a wide range of Reynolds number, based on tube diameter, from 2167 to 19400 at various spherical P.V.C porous media particle diameters from 3 to 12 mm as well as without porous media (empty section).
The results, presented here, are divided into two sets. The first set shows the relationship between the Nusselt number and the Reynolds number at various sphere diameters, (from 3 to 12 mm) for P.V.C porous media. The effect of the bed diameter ratio (D/d) on the Nusselt number at various Reynolds number is also investigated.
The second set of data shows the relationship between the pressure drop across the test section and the Reynolds number at various sphere diameters (from 3 to 12 mm).
The results of this experimental work shows that the Nusselt number improves by a factor of 3.8 to 6.3 times when using porous media for porous diameters from 12 to 3 mm respectively as compared to the empty tube.
The objective of this research is to obtain the relationship between Nusselt and Reynolds numbers for fluid flow in packed bed for using spheres ofdifferent sizes. Also, to develop a universal relationship for the Nusselt number in a wide range of Reynolds number and compare the results with those for an empty tube.
Several researchers have studied the mechanisms of enhancement of the heat transfer coefficient by different methods, including control on the temperature levels, improving the forced convection heat transfer mode by increasing the disturbances in the fluid flow, or by increase of the heat transfer surface area. Another technique is based on inducing more turbulence, eddies and pressure drop when the flow passes around a rigid body.such as a spheres or other geometrical shapes, which results in increasing the heat transfer coefficient. This technique is adapted in the present work.
The experimental work has covered a wide range of Reynolds number, based on tube diameter, from 2167 to 19400 at various spherical P.V.C porous media particle diameters from 3 to 12 mm as well as without porous media (empty section).
The results, presented here, are divided into two sets. The first set shows the relationship between the Nusselt number and the Reynolds number at various sphere diameters, (from 3 to 12 mm) for P.V.C porous media. The effect of the bed diameter ratio (D/d) on the Nusselt number at various Reynolds number is also investigated.
The second set of data shows the relationship between the pressure drop across the test section and the Reynolds number at various sphere diameters (from 3 to 12 mm).
The results of this experimental work shows that the Nusselt number improves by a factor of 3.8 to 6.3 times when using porous media for porous diameters from 12 to 3 mm respectively as compared to the empty tube.
Other data
| Title | EXPERIMENTAL EVALUATION OF PACKED BED HEAT TRANSFER RELATIONS | Other Titles | تقدير معملى لعلاقات انتقال الحرارة بالاوساط المسامية | Authors | Mohamed Abdel-Hameed Salama | Issue Date | 2004 |
Attached Files
| File | Size | Format | |
|---|---|---|---|
| B15030.pdf | 1 MB | Adobe PDF | View/Open |
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