Details
| Original language | English |
|---|---|
| Pages (from-to) | 801-809 |
| Number of pages | 9 |
| Journal | Journal of Thermophysics and Heat Transfer |
| Volume | 23 |
| Issue number | 4 |
| Publication status | Published - 23 May 2012 |
Abstract
This study investigates the effects of wall heating and skin friction on the characteristics of a compressible turbulent flow in developing and developed regions of a pipe. The numerical solution is performed by finite-element-based finite volume method applied on unstructured grids. A modified κ-ε model with a two-layer equation for the near-wall region and a compressibility correction are used to predict turbulent viscosity. The results show that shear stress in fully developed flow is nearly constant from the centerline up to 75% of the pipe radius, then increases sharply next to the wall, and the ratio of the turbulent viscosity to the molecular one is less than 0.2. Under a uniform wall heat flux condition, the friction factor decreases in the entrance region and will be fully developed after Z/D > 50, but the Nusselt number increases first and then will be fully developed after Z/D > 10. In addition, the heat flux accelerates the developing compressible flow and causes the entrance length to decrease, unlike the incompressible flow.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Aerospace Engineering
- Engineering(all)
- Mechanical Engineering
- Chemical Engineering(all)
- Fluid Flow and Transfer Processes
- Earth and Planetary Sciences(all)
- Space and Planetary Science
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In: Journal of Thermophysics and Heat Transfer, Vol. 23, No. 4, 23.05.2012, p. 801-809.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Numerical Simulation of Developing Compressible Turbulent Flow with Heat Transfer
AU - Nouri-Borujerdi, A.
AU - Ziaei-Rad, M.
AU - Seume, J. R.
PY - 2012/5/23
Y1 - 2012/5/23
N2 - This study investigates the effects of wall heating and skin friction on the characteristics of a compressible turbulent flow in developing and developed regions of a pipe. The numerical solution is performed by finite-element-based finite volume method applied on unstructured grids. A modified κ-ε model with a two-layer equation for the near-wall region and a compressibility correction are used to predict turbulent viscosity. The results show that shear stress in fully developed flow is nearly constant from the centerline up to 75% of the pipe radius, then increases sharply next to the wall, and the ratio of the turbulent viscosity to the molecular one is less than 0.2. Under a uniform wall heat flux condition, the friction factor decreases in the entrance region and will be fully developed after Z/D > 50, but the Nusselt number increases first and then will be fully developed after Z/D > 10. In addition, the heat flux accelerates the developing compressible flow and causes the entrance length to decrease, unlike the incompressible flow.
AB - This study investigates the effects of wall heating and skin friction on the characteristics of a compressible turbulent flow in developing and developed regions of a pipe. The numerical solution is performed by finite-element-based finite volume method applied on unstructured grids. A modified κ-ε model with a two-layer equation for the near-wall region and a compressibility correction are used to predict turbulent viscosity. The results show that shear stress in fully developed flow is nearly constant from the centerline up to 75% of the pipe radius, then increases sharply next to the wall, and the ratio of the turbulent viscosity to the molecular one is less than 0.2. Under a uniform wall heat flux condition, the friction factor decreases in the entrance region and will be fully developed after Z/D > 50, but the Nusselt number increases first and then will be fully developed after Z/D > 10. In addition, the heat flux accelerates the developing compressible flow and causes the entrance length to decrease, unlike the incompressible flow.
UR - http://www.scopus.com/inward/record.url?scp=73949095421&partnerID=8YFLogxK
U2 - 10.2514/1.41669
DO - 10.2514/1.41669
M3 - Article
AN - SCOPUS:73949095421
VL - 23
SP - 801
EP - 809
JO - Journal of Thermophysics and Heat Transfer
JF - Journal of Thermophysics and Heat Transfer
SN - 0887-8722
IS - 4
ER -