Abstract
For corrugated pipes with a square groove, it is known that there is no interaction between the main flow and groove flow when the aspect ratio is less than four. When the groove length and height are different, the interaction occurs in the pipe. In previous studies, it was investigated whether this interaction is dependent on groove length. However, when changing the groove height, the shape of the vortex generated inside the groove changes, which may cause the interaction to occur. Therefore, in this paper the interaction between the main and groove flow of corrugated pipes is investigated when changing both groove height as well as groove pitch, corresponding to an aspect ratio of less than four. For the groove height, the flow out of the groove after impingement changes with the shape of the secondary vortex in the groove. This flow deforms the velocity distribution in the main flow, and thus the friction factor is different. For the groove pitch, there is no difference in v-velocity distribution at the interface at the 5th and 20th groove. This means there is no interaction between the grooves, and, the friction factor differs as the number of grooves differs.
Highlights
It was shown that interaction existed even when the aspect ratio was less than four, and Stel et al [11] concluded that the radius of the internal vortex’s rotation increases, and the shape of the vortex in the groove changes according to the change in the height of the groove
Flow characteristics and their implications were numerically analyzed against changes in corrugated pipe groove height and pitch when the aspect ratio is less than four
The following conclusions were obtained: When changing the groove height, the friction factor in the corrugated pipe is larger than a smooth pipe
Summary
Pipes play an essential role in transferring energy and fluid in a wide range of settings including fire industries, power plants, plumbing, and buildings. In the case of type-k, this refers to the pipe where the groove length is greater than the groove height In this case, the main flow enters the groove and interacts with it, since the vortex inside the groove only occurs in the groove’s corner. These flows increase turbulent kinetic energy and Reynolds stress in the downstream portion of the groove, and friction factor increases It was shown that interaction existed even when the aspect ratio was less than four, and Stel et al [11] concluded that the radius of the internal vortex’s rotation increases, and the shape of the vortex in the groove changes according to the change in the height of the groove This change of vortex caused a change in v-velocity at the groove and main flow boundary. To justify using a k-ε model we compared our velocity distribution in the corrugated pipe with the velocity distribution of Vijiapurapu et al [12]
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