TY - JOUR
T1 - Heat transfer behavior of temperature-dependent viscoelastic non-Newtonian fluid with buoyancy effect in 2:1 rectangular duct
AU - Chang-Hyun, Sohn
AU - Seong-Tae, Ahn
AU - Sehyun, Shin
PY - 2000/2
Y1 - 2000/2
N2 - This numerical study investigates the flow characteristics and heat transfer mechanism of a viscoelastic non-Newtonian fluid in a 2:1 rectangular duct. The combined effect of temperature-dependent viscosity, buoyancy, and secondary flow caused by a second normal-stress difference is considered. The Reiner-Rivlin constitutive equation was adopted to model the viscoelastic fluid characteristics. An axially constant heat flux on the bottom wall and peripherally adiabatic boundary condition (H2) were both used. The numerical results for a polyacrylamide (Separan AP-273) solution showed a significant heat transfer enhancement compared to those of a constant property fluid, and exhibited a good consistency with experimental results for both thermal developing and thermally developed regions. In a bottom-wall-heated 2:1 rectangular duct, the main cause of the heat transfer enhancement of the viscoelastic fluid was viscoelastic-driven secondary flow, with temperature-dependent viscosity and buoyancy-induced secondary flow playing supporting roles. (C) 2000 Elsevier Science Ltd.
AB - This numerical study investigates the flow characteristics and heat transfer mechanism of a viscoelastic non-Newtonian fluid in a 2:1 rectangular duct. The combined effect of temperature-dependent viscosity, buoyancy, and secondary flow caused by a second normal-stress difference is considered. The Reiner-Rivlin constitutive equation was adopted to model the viscoelastic fluid characteristics. An axially constant heat flux on the bottom wall and peripherally adiabatic boundary condition (H2) were both used. The numerical results for a polyacrylamide (Separan AP-273) solution showed a significant heat transfer enhancement compared to those of a constant property fluid, and exhibited a good consistency with experimental results for both thermal developing and thermally developed regions. In a bottom-wall-heated 2:1 rectangular duct, the main cause of the heat transfer enhancement of the viscoelastic fluid was viscoelastic-driven secondary flow, with temperature-dependent viscosity and buoyancy-induced secondary flow playing supporting roles. (C) 2000 Elsevier Science Ltd.
UR - http://www.scopus.com/inward/record.url?scp=0034144077&partnerID=8YFLogxK
U2 - 10.1016/S0735-1933(00)00097-X
DO - 10.1016/S0735-1933(00)00097-X
M3 - Article
AN - SCOPUS:0034144077
SN - 0735-1933
VL - 27
SP - 159
EP - 168
JO - International Communications in Heat and Mass Transfer
JF - International Communications in Heat and Mass Transfer
IS - 2
ER -