TY - JOUR
T1 - Hysteretic phenomena in transition from forced convection to natural convection around a heated cylinder
AU - Suzuki, Hiroshi
AU - Iwasaki, Yoshiro
AU - Hara, Kenji
AU - Prabowo,
AU - Kikuchi, Yoshihiro
PY - 1998
Y1 - 1998
N2 - Two-dimensional numerical computations have been conducted to investigate combined forced and natural convection around a cylinder in a cross flow. Reynolds number, Re, ranged between 75 and 150. Rayleigh number, Ra, was changed from 0 to 7×105. Combined convective heat transfer characteristics cannot be expressed by a simple summation of forced and natural convective heat transfer characteristics. An abrupt decrease of mean Nusselt number, Num, is observed in transition from forced convection to natural convection. A hysteresis occurs in the transition region and Nu m has two different values which depend on initial conditions. This is attributed to subcritical bifurcation of flow behind the cylinder. Nu m is higher for unsteady flows than for steady flow in such a transition region.
AB - Two-dimensional numerical computations have been conducted to investigate combined forced and natural convection around a cylinder in a cross flow. Reynolds number, Re, ranged between 75 and 150. Rayleigh number, Ra, was changed from 0 to 7×105. Combined convective heat transfer characteristics cannot be expressed by a simple summation of forced and natural convective heat transfer characteristics. An abrupt decrease of mean Nusselt number, Num, is observed in transition from forced convection to natural convection. A hysteresis occurs in the transition region and Nu m has two different values which depend on initial conditions. This is attributed to subcritical bifurcation of flow behind the cylinder. Nu m is higher for unsteady flows than for steady flow in such a transition region.
KW - Bifurcation
KW - Combined convection
KW - Convective heat transfer
KW - Hysteresis
KW - Numerical simulation
KW - Transition phenomena
UR - http://www.scopus.com/inward/record.url?scp=77950036439&partnerID=8YFLogxK
U2 - 10.1299/kikaib.64.849
DO - 10.1299/kikaib.64.849
M3 - Article
AN - SCOPUS:77950036439
SN - 0387-5016
VL - 64
SP - 849
EP - 855
JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
IS - 619
ER -