Measurements were carried out to investigate the enhancement in the heat transfer and the influen... more Measurements were carried out to investigate the enhancement in the heat transfer and the influence of the flow friction in a rectangular channel using periodic zigzag (multiple V-shaped) ribs affixed, in tandem, on the bottom surface of the channel, which was heated with a uniform heat flux. A horizontal rectangular channel with an aspect ratio, (height/width), of 1:4 was examined. The ribs were arranged in an in-line arrangement such that repeated V-shaped secondary flow cells were established. The present experiments were conducted for a range of Reynolds number from 15,000 to 75,000, rib height-to-pitch (e/p) ratio between 0.0375 and 0.15, and for three rib angles (α) of 30, 45 and 60 deg, respectively. An efficiency index of about 0.6 was observed for rib angles of 45 and 60 deg. at the lowest rib height to pitch ratio. New correlations were obtained for the influence of rib height-to-pitch ratio, rib angle, and Reynolds number on both Nusselt number enhancement ratio and flow ...
This paper presents an experimental study of the heat transfer and flow friction for turbulent fl... more This paper presents an experimental study of the heat transfer and flow friction for turbulent flows of air over a heated flat plate mounted downstream of a fence. A rectangular brass plate is attached to a heating unit and fixed inside the test section of a subsonic wind tunnel. A number of non-metallic fences with different heights are used separately to promote turbulence over the plate. A series of experiments are conducted to examine the following parameters: fence height to plate length ratio (H/L), the distance between the fence and plate relative to plate length (S/L) and the Reynolds number, which is calculated based on the stream wise length of the plate (1.5×10 5 ≤ ReL≤ 4.5×10 5 ). The first set of the results, which is obtained for the case of the flat plate without a fence, satisfied with other published results. The results in the cases of the plate placed downstream of a fence revealed that the Nusselt number and friction factor are critically dependent on the fence h...
Measurements were carried out to investigate the enhancement in the heat transfer and the influen... more Measurements were carried out to investigate the enhancement in the heat transfer and the influence of the flow friction in a rectangular channel using periodic zigzag (multiple V-shaped) ribs affixed, in tandem, on the bottom surface of the channel, which was heated with a uniform heat flux. A horizontal rectangular channel with an aspect ratio, (height/width), of 1:4 was examined. The ribs were arranged in an in-line arrangement such that repeated V-shaped secondary flow cells were established. The present experiments were conducted for a range of Reynolds number from 15,000 to 75,000, rib height-to-pitch (e/p) ratio between 0.0375 and 0.15, and for three rib angles (α) of 30, 45 and 60 deg, respectively. An efficiency index of about 0.6 was observed for rib angles of 45 and 60 deg. at the lowest rib height to pitch ratio. New correlations were obtained for the influence of rib height-to-pitch ratio, rib angle, and Reynolds number on both Nusselt number enhancement ratio and flow ...
This paper presents an experimental study of the heat transfer and flow friction for turbulent fl... more This paper presents an experimental study of the heat transfer and flow friction for turbulent flows of air over a heated flat plate mounted downstream of a fence. A rectangular brass plate is attached to a heating unit and fixed inside the test section of a subsonic wind tunnel. A number of non-metallic fences with different heights are used separately to promote turbulence over the plate. A series of experiments are conducted to examine the following parameters: fence height to plate length ratio (H/L), the distance between the fence and plate relative to plate length (S/L) and the Reynolds number, which is calculated based on the stream wise length of the plate (1.5×10 5 ≤ ReL≤ 4.5×10 5 ). The first set of the results, which is obtained for the case of the flat plate without a fence, satisfied with other published results. The results in the cases of the plate placed downstream of a fence revealed that the Nusselt number and friction factor are critically dependent on the fence h...
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Papers by S A. Moneim