Browsing by Author "Tong, BH"

Now showing 1 - 4 of 4

Effects of eccentricity of cylinder and blockage ratio on heat transfer by an oscillating cylinder in a channel flow
(2003-04-01)
Fu, WS
;
Tong, BH
;
機械工程學系
;
Department of Mechanical Engineering
A numerical simulation is performed to study the influence on heat transfer rate of heated walls in a channel with an oscillating cylinder. An arbitrary Lagrangian-Eulerian kinematic description method is adopted to describe the flow and thermal fields. A penalty consistent finite element formulation is applied to solve the governing equations. The effects of the eccentricity of cylinder ratio and blockage on the heat transfer characteristics of the heated wall are examined. The results show that the position and the diameter of the cylinder in the cylinder have great effects on the flow and thermal fields in the channel flow. (C) 2003 Elsevier Science Ltd.
Numerical investigation of heat transfer characteristics of the heated blocks in the channel with a transversely oscillating cylinder
(2004-01-01)
Fu, WS
;
Tong, BH
;
機械工程學系
;
Department of Mechanical Engineering
A numerical simulation is performed to study the influence of an oscillating cylinder on the heat transfer from heated blocks in a channel flow. An arbitrary Lagrangian-Eulerian kinematics description method is adopted to describe the flow and thermal fields. A penalty consistent finite element formulation is applied to solve the governing equations. The effects of Reynolds number, oscillating amplitude and oscillating frequency on the heat transfer characteristics of the heated wall are examined. The results show that the heat transfer from heated blocks is enhanced remarkably as the oscillating frequency of the cylinder is in lock-in region. (C) 2003 Elsevier Ltd. All rights reserved.
Numerical investigation of heat transfer from a heated oscillating cylinder in a cross flow
(2002-07-01)
Fu, WS
;
Tong, BH
;
機械工程學系
;
Department of Mechanical Engineering
A numerical simulation is performed to study the flow structures and heat transfer characteristics of a heated transversely oscillating cylinder in a cross flow. The variations of flow and thermal fields are classified into a class of moving boundary problems. The moving interfaces between the fluid and cylinder have been considered. An arbitrary Lagrangian-Eulerian kinematic description method is adopted to describe the flow and thermal fields. A penalty consistent finite element formulation is applied to solve the governing equations. The subsequent developments of the vortex shedding and heat transfer characteristics around the heated cylinder are presented in detail. The effects of Reynolds number, oscillating amplitude, oscillating speed on the flow structures and heat transfer characteristics are examined. The results show that the interaction between the oscillating cylinder and vortex shedding from the cylinder dominates the state of the wake. The flow and thermal fields may approach a periodic state in lock-in regime. The heat transfer of the cylinder in the lock-in regime is enhanced remarkably. (C) 2002 Published by Elsevier Science Ltd.
Numerical investigation of heat transfer of a heated channel with an oscillating cylinder
(2003-05-01)
Fu, WS
;
Tong, BH
;
機械工程學系
;
Department of Mechanical Engineering
A numerical simulation is performed to study the influence on the heat transfer rate of the heated wall in the channel with an oscillating cylinder. An arbitrary Lagrangian-Eulerian kinematic description method is adopted to describe the flow and thermal fields. A penalty consistent finite-element formulation is applied to solve the governing equations. The effects of Reynolds number, oscillating amplitude, oscillating frequency, eccentric ratio, and blockage on the heat transfer characteristics of the heated wall are examined. The results show that not only the region relating to heat transfer is enlarged substantially, but also that the heat transfer rate of this region is enhanced remarkably.