Direct numerical simulation of turbulent heat transfer in an axially rotating pipe flow
Conference
·
OSTI ID:20026793
A direct numerical simulation (DNS) has been carried out to grasp and understand a laminarization phenomenon caused by a pipe rotation. As for fully-developed turbulent rotating pipe flows, the DNS with turbulent transport of a scalar quantity has been performed. In this paper, the Reynolds number, which was based on bulk velocity and pipe diameter, was set to be constant; Re{sub b} = 5,293, and the rotating ratios of a wall velocity to a bulk velocity were set to be 0.25, 0.3 and 0.35. A uniform heat-flux was applied to the wall as a thermal boundary condition. Prandtl number of the working fluid was set to be 0.71. The turbulent statistics regarding to the mean flow, temperature fluctuations, turbulent stresses and pressure distribution were obtained. Moreover, the scalar-flux budgets were also obtained for each rotation ratio. The mean velocity profile in the circumferential direction indicated a parabolic distribution except the near-wall-region. The turbulent drag decreased with higher rotation ratio. The reason of this drag reduction can be considered that an additional rotational production term appears in the azimuthal turbulence component. The Nusselt number is also decreased with the rotation ratio increase because of this laminarization effect.
- Research Organization:
- Toyama Univ. (JP)
- OSTI ID:
- 20026793
- Country of Publication:
- United States
- Language:
- English
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