TY - JOUR
T1 - Buoyancy induced secondary vortices in the entrance section of a horizontal straight tube
AU - Sillekens, J.J.M.
AU - Rindt, C.C.M.
AU - Steenhoven, van, A.A.
PY - 1998
Y1 - 1998
N2 - Developing mixed convective flow in the entrance section of a horizontal straight tube is analyzed with special emphasis on the buoyancy-induced secondary vortices. The flow is subject to a constant wall temperature. Elliptic calculations on a half gross-section grid are performed for various Grashof numbers and two Prandtl numbers. It appears that for air (Pr=0.7) the flow exhibits a two-vortex solution for all Grashof numbers and axial positions investigated, whereas for water (Pr=5.0), secondary flow evolves from a two-vortex solution, via a four-voltex solution toward a six-voltex solution for increasing Grashof numbers and axial distances. Calculations on a full cross-section grid reveal that these solutions are axial distances. Calculations on a full cross-section grid reveal that these solutions are insensitive to white noise perturbations in the "initial" flow field.
AB - Developing mixed convective flow in the entrance section of a horizontal straight tube is analyzed with special emphasis on the buoyancy-induced secondary vortices. The flow is subject to a constant wall temperature. Elliptic calculations on a half gross-section grid are performed for various Grashof numbers and two Prandtl numbers. It appears that for air (Pr=0.7) the flow exhibits a two-vortex solution for all Grashof numbers and axial positions investigated, whereas for water (Pr=5.0), secondary flow evolves from a two-vortex solution, via a four-voltex solution toward a six-voltex solution for increasing Grashof numbers and axial distances. Calculations on a full cross-section grid reveal that these solutions are axial distances. Calculations on a full cross-section grid reveal that these solutions are insensitive to white noise perturbations in the "initial" flow field.
U2 - 10.1080/10407789808913943
DO - 10.1080/10407789808913943
M3 - Article
VL - 33
SP - 355
EP - 369
JO - Numerical Heat Transfer. Part A : Applications
JF - Numerical Heat Transfer. Part A : Applications
SN - 1040-7782
IS - 4
ER -